Rails - Jul 2011 - accepts_nested_attributes_for doesn't show output

Hello,
     An earlier post where I asked how to put mulitple tables''s input
on one screen was answered with "accepts_nested_attributes_for" and
that seems to be what I need, but nothing appears on the screen for
the nested section.  I''ve been using ideas from:

http://masonoise.wordpress.com/2010/07/23/rails-and-forms-using-accepts_nested_attributes_for/
http://railscasts.com/episodes/196-nested-model-form-part-1
http://asciicasts.com/episodes/196-nested-model-form-part-1
http://api.rubyonrails.org/classes/ActiveRecord/NestedAttributes/ClassMethods.html#method-i-accepts_nested_attributes_for

The following are my classes and a little code from the
"_form.html.erb" that I''m trying to make work:

class Person < ActiveRecord::Base
	default_scope :order => ''last_name''
	has_many :people_skills

	accepts_nested_attributes_for :people_skills, :update_only =>
true, :allow_destroy => true
end

class PeopleSkill < ActiveRecord::Base
	belongs_to :person
end

Also, there is a field in the people_skills table that is person_id,
which I remember reading in the "Agile.." book creates an FK there.

<%= form_for(@person) do |f| %>
  <% if @person.errors.any? %>
    # ... usual code concerning errors
  <% end %>

  <%= f.fields_for :people_skills do |builder| %>
      <%= builder.label :skill, "Skill" %><br />
      <%= builder.text_field :skill %>
    </p>
    <p>
      <%= builder.label :competency, "Competency" %><br />
      <%= builder.text_field :competency %>
    </p>
  <% end %>

  <table>
    <tr>
      <td>
        <div class="field">
          <%= f.label :first_name %><br />
          <%= f.text_field :first_name %>
	</div>
      </td>
      <td>
AND THEN MANY OTHER ROWS AND FIELDS OF THIS TABLE.

The table data for the class "Person" shows up fine, but anything with
the "f.fields_for..." is invisible (but doesn''t cause a
syntax
error).  What DOES cause an error is to put
"@Person.people_skills.build" in the "new" method of
people_controller.rb.

So, I''m looking for a way to have one screen which creates entries in
2 tables, linked by the PK-FK.  What am I doing wrong or forgetting to
do?
     Thanks,
          Barney

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Hi Barney,

I believe I am having the same problem you experienced, though my code 
is a little different. If you or anyone else can tell me how to solve it 
that would be great!

I am creating a db of Universities and resources. One University can 
have many resources, but one resource can only come from one University. 
I am trying to create a form with nested attributes, so hat users wil be 
encouraged to give details about the University where the resource comes 
from.

Code from views/universities/_form:

<%= form_for(@university) do |f| %>
<% if @university.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(@university.errors.count, "error") %>
prohibited this
university from being saved:</h2>

<ul>
<% @university.errors.full_messages.each do |msg| %>
<li><%= msg %></li>
<% end %>
</ul>
</div>
<% end %>

<div class="field">
<%= f.label :name %><br />
<%= f.text_field :name %>
</div>
<div class="field">
<%= f.label :address %><br />
<%= f.text_field :address %>
</div>
<div class="field">
<%= f.label :country %><br />
<%= f.text_field :country %>
</div>

<% f.fields_for :resources do |builder| %>
<%= render "resources/form", :f => builder %>
<% end %>
<div class="actions">
<%= f.submit %>
</div>
<% end %>

Code from views/resources/_form:


<div class="field">
<%= f.label :subject %><br />
<%= f.text_field :subject %>
</div>
<div class="field">
<%= f.label :course %><br />
<%= f.text_field :course %>
</div>
<div class="field">
<%= f.label :alternative_use %><br />
<%= f.text_field :alternative_use %>
</div>
<div class="field">
<%= f.label :author %><br />
<%= f.text_field :author %>
</div>
<div class="field">
<%= f.label :resource_type %><br />
<%= f.text_field :resource_type %>
</div>

Code from models:

     class University < ActiveRecord::Base
has_many :resources
accepts_nested_attributes_for :resources, :allow_destroy => :true,
     :reject_if => proc { |attrs| attrs.all? { |k, v| v.blank? } }
attr_accessible :resource_attributes
end

class Resource < ActiveRecord::Base
#Defines the relationship between resource and user.
belongs_to :user
belongs_to :university
attr_accessible :resource_type, :subject, :author, :course, 
:alternative_use,
#Need to add some more validation to the fields.
def self.search(search)
   if search
     find(:all, :conditions => [''subject LIKE ?'',
"%#{search}%"])
   else
     find(:all)
   end
end
#End class.
end

Thanks in advance,
Jen!

On 17/07/11 22:27, Barney wrote:
> Hello,
>       An earlier post where I asked how to put mulitple tables''s
input
> on one screen was answered with "accepts_nested_attributes_for"
and
> that seems to be what I need, but nothing appears on the screen for
> the nested section.  I''ve been using ideas from:
>
>
http://masonoise.wordpress.com/2010/07/23/rails-and-forms-using-accepts_nested_attributes_for/
> http://railscasts.com/episodes/196-nested-model-form-part-1
> http://asciicasts.com/episodes/196-nested-model-form-part-1
>
http://api.rubyonrails.org/classes/ActiveRecord/NestedAttributes/ClassMethods.html#method-i-accepts_nested_attributes_for
>
> The following are my classes and a little code from the
> "_form.html.erb" that I''m trying to make work:
>
> class Person<  ActiveRecord::Base
> 	default_scope :order =>  ''last_name''
> 	has_many :people_skills
>
> 	accepts_nested_attributes_for :people_skills, :update_only =>
> true, :allow_destroy =>  true
> end
>
> class PeopleSkill<  ActiveRecord::Base
> 	belongs_to :person
> end
>
> Also, there is a field in the people_skills table that is person_id,
> which I remember reading in the "Agile.." book creates an FK
there.
>
> <%= form_for(@person) do |f| %>
>    <% if @person.errors.any? %>
>      # ... usual code concerning errors
>    <% end %>
>
>    <%= f.fields_for :people_skills do |builder| %>
>        <%= builder.label :skill, "Skill" %><br />
>        <%= builder.text_field :skill %>
>      </p>
>      <p>
>        <%= builder.label :competency, "Competency" %><br
/>
>        <%= builder.text_field :competency %>
>      </p>
>    <% end %>
>
>    <table>
>      <tr>
>        <td>
>          <div class="field">
>            <%= f.label :first_name %><br />
>            <%= f.text_field :first_name %>
> 	</div>
>        </td>
>        <td>
> AND THEN MANY OTHER ROWS AND FIELDS OF THIS TABLE.
>
> The table data for the class "Person" shows up fine, but anything
with
> the "f.fields_for..." is invisible (but doesn''t cause a
syntax
> error).  What DOES cause an error is to put
> "@Person.people_skills.build" in the "new" method of
> people_controller.rb.
>
> So, I''m looking for a way to have one screen which creates entries
in
> 2 tables, linked by the PK-FK.  What am I doing wrong or forgetting to
> do?
>       Thanks,
>            Barney
>
\

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I forgot to mention that currently each of my tables is handled by a 
separate controller.

I thought this would be ok and anything entered in my resources _form 
partial would be handled by the ''resources'' controller etc.
However
looking at the rails cast source code has confused me a bit, as it seems 
that all the tables are managed by one controller. Are my nested fields 
not rendering because the universities table and resources have their 
own totally separate controllers?

I will be experimenting with this more tomorrow. If someone could 
clarify this point about the controllers it would really help.

Thanks,
Jen!

On 19/07/11 16:49, Jen wrote:
>     Hi Barney,
>
> I believe I am having the same problem you experienced, though my code 
> is a little different. If you or anyone else can tell me how to solve 
> it that would be great!
>
> I am creating a db of Universities and resources. One University can 
> have many resources, but one resource can only come from one 
> University. I am trying to create a form with nested attributes, so 
> hat users wil be encouraged to give details about the University where 
> the resource comes from.
>
> Code from views/universities/_form:
>
> <%= form_for(@university) do |f| %>
> <% if @university.errors.any? %>
> <div id="error_explanation">
> <h2><%= pluralize(@university.errors.count, "error")
%> prohibited
> this university from being saved:</h2>
>
> <ul>
> <% @university.errors.full_messages.each do |msg| %>
> <li><%= msg %></li>
> <% end %>
> </ul>
> </div>
> <% end %>
>
> <div class="field">
> <%= f.label :name %><br />
> <%= f.text_field :name %>
> </div>
> <div class="field">
> <%= f.label :address %><br />
> <%= f.text_field :address %>
> </div>
> <div class="field">
> <%= f.label :country %><br />
> <%= f.text_field :country %>
> </div>
>
> <% f.fields_for :resources do |builder| %>
> <%= render "resources/form", :f => builder %>
> <% end %>
> <div class="actions">
> <%= f.submit %>
> </div>
> <% end %>
>
> Code from views/resources/_form:
>
>
> <div class="field">
> <%= f.label :subject %><br />
> <%= f.text_field :subject %>
> </div>
> <div class="field">
> <%= f.label :course %><br />
> <%= f.text_field :course %>
> </div>
> <div class="field">
> <%= f.label :alternative_use %><br />
> <%= f.text_field :alternative_use %>
> </div>
> <div class="field">
> <%= f.label :author %><br />
> <%= f.text_field :author %>
> </div>
> <div class="field">
> <%= f.label :resource_type %><br />
> <%= f.text_field :resource_type %>
> </div>
>
> Code from models:
>
>     class University < ActiveRecord::Base
> has_many :resources
> accepts_nested_attributes_for :resources, :allow_destroy => :true,
>     :reject_if => proc { |attrs| attrs.all? { |k, v| v.blank? } }
> attr_accessible :resource_attributes
> end
>
> class Resource < ActiveRecord::Base
> #Defines the relationship between resource and user.
> belongs_to :user
> belongs_to :university
> attr_accessible :resource_type, :subject, :author, :course, 
> :alternative_use,
> #Need to add some more validation to the fields.
> def self.search(search)
>   if search
>     find(:all, :conditions => [''subject LIKE ?'',
"%#{search}%"])
>   else
>     find(:all)
>   end
> end
> #End class.
> end
>
> Thanks in advance,
> Jen!
>
> On 17/07/11 22:27, Barney wrote:
>> Hello,
>>       An earlier post where I asked how to put mulitple
tables''s input
>> on one screen was answered with
"accepts_nested_attributes_for" and
>> that seems to be what I need, but nothing appears on the screen for
>> the nested section.  I''ve been using ideas from:
>>
>>
http://masonoise.wordpress.com/2010/07/23/rails-and-forms-using-accepts_nested_attributes_for/
>>
>> http://railscasts.com/episodes/196-nested-model-form-part-1
>> http://asciicasts.com/episodes/196-nested-model-form-part-1
>>
http://api.rubyonrails.org/classes/ActiveRecord/NestedAttributes/ClassMethods.html#method-i-accepts_nested_attributes_for
>>
>>
>> The following are my classes and a little code from the
>> "_form.html.erb" that I''m trying to make work:
>>
>> class Person<  ActiveRecord::Base
>>     default_scope :order =>  ''last_name''
>>     has_many :people_skills
>>
>>     accepts_nested_attributes_for :people_skills, :update_only =>
>> true, :allow_destroy =>  true
>> end
>>
>> class PeopleSkill<  ActiveRecord::Base
>>     belongs_to :person
>> end
>>
>> Also, there is a field in the people_skills table that is person_id,
>> which I remember reading in the "Agile.." book creates an FK
there.
>>
>> <%= form_for(@person) do |f| %>
>> <% if @person.errors.any? %>
>>      # ... usual code concerning errors
>> <% end %>
>>
>> <%= f.fields_for :people_skills do |builder| %>
>> <%= builder.label :skill, "Skill" %><br />
>> <%= builder.text_field :skill %>
>> </p>
>> <p>
>> <%= builder.label :competency, "Competency" %><br
/>
>> <%= builder.text_field :competency %>
>> </p>
>> <% end %>
>>
>> <table>
>> <tr>
>> <td>
>> <div class="field">
>> <%= f.label :first_name %><br />
>> <%= f.text_field :first_name %>
>> </div>
>> </td>
>> <td>
>> AND THEN MANY OTHER ROWS AND FIELDS OF THIS TABLE.
>>
>> The table data for the class "Person" shows up fine, but
anything with
>> the "f.fields_for..." is invisible (but doesn''t
cause a syntax
>
>
>> error).  What DOES cause an error is to put
>> "@Person.people_skills.build" in the "new" method
of
>> people_controller.rb.
>>
>> So, I''m looking for a way to have one screen which creates
entries in
>> 2 tables, linked by the PK-FK.  What am I doing wrong or forgetting to
>> do?
>>       Thanks,
>>            Barney
>>
> \
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On Jul 17, 10:27 pm, Barney
<bsper...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> Hello,
>      An earlier post where I asked how to put mulitple tables''s
input
> on one screen was answered with "accepts_nested_attributes_for"
and
> that seems to be what I need, but nothing appears on the screen for
> the nested section.  I''ve been using ideas from:
>
>
http://masonoise.wordpress.com/2010/07/23/rails-and-forms-using-accep...http://railscasts.com/episodes/196-nested-model-form-part-1http://asciicasts.com/episodes/196-nested-model-form-part-1http://api.rubyonrails.org/classes/ActiveRecord/NestedAttributes/Clas...
>
> The following are my classes and a little code from the
> "_form.html.erb" that I''m trying to make work:
>
> class Person < ActiveRecord::Base
>         default_scope :order => ''last_name''
>         has_many :people_skills
>
>         accepts_nested_attributes_for :people_skills, :update_only =>
> true, :allow_destroy => true
> end
>
> class PeopleSkill < ActiveRecord::Base
>         belongs_to :person
> end
>
> Also, there is a field in the people_skills table that is person_id,
> which I remember reading in the "Agile.." book creates an FK
there.
>
> <%= form_for(@person) do |f| %>
>   <% if @person.errors.any? %>
>     # ... usual code concerning errors
>   <% end %>
>
>   <%= f.fields_for :people_skills do |builder| %>
>       <%= builder.label :skill, "Skill" %><br />
>       <%= builder.text_field :skill %>
>     </p>
>     <p>
>       <%= builder.label :competency, "Competency" %><br
/>
>       <%= builder.text_field :competency %>
>     </p>
>   <% end %>
>
>   <table>
>     <tr>
>       <td>
>         <div class="field">
>           <%= f.label :first_name %><br />
>           <%= f.text_field :first_name %>
>         </div>
>       </td>
>       <td>
> AND THEN MANY OTHER ROWS AND FIELDS OF THIS TABLE.
>
> The table data for the class "Person" shows up fine, but anything
with
> the "f.fields_for..." is invisible (but doesn''t cause a
syntax
> error).  What DOES cause an error is to put
What is the error message? What''s the stack trace?
> "@Person.people_skills.build" in the "new" method of
> people_controller.rb.
What''s the code in your controller - @Person.people... or
@person.people... - is the error message due to a capitalization typo?
(wouldn''t know without seeing the error msg
>
> So, I''m looking for a way to have one screen which creates entries
in
> 2 tables, linked by the PK-FK.  What am I doing wrong or forgetting to
> do?
>      Thanks,
>           Barney
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Sent from my iPad

On Jul 19, 2011, at 6:33 PM, Jen
<jen.bottom-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> I forgot to mention that currently each of my tables is handled by a
separate controller.
> 
> I thought this would be ok and anything entered in my resources _form
partial would be handled by the ''resources'' controller etc.
However looking at the rails cast source code has confused me a bit, as it seems
that all the tables are managed by one controller. Are my nested fields not
rendering because the universities table and resources have their own totally
separate controllers?
> 
> I will be experimenting with this more tomorrow. If someone could clarify
this point about the controllers it would really help.
> 
> Thanks,
> Jen!
> 
> On 19/07/11 16:49, Jen wrote:
>>    Hi Barney,
>> 
>> I believe I am having the same problem you experienced, though my code
is a little different. If you or anyone else can tell me how to solve it that
would be great!
>> 
>> I am creating a db of Universities and resources. One University can
have many resources, but one resource can only come from one University. I am
trying to create a form with nested attributes, so hat users wil be encouraged
to give details about the University where the resource comes from.
>> 
>> Code from views/universities/_form:
>> 
>> <%= form_for(@university) do |f| %>
>> <% if @university.errors.any? %>
>> <div id="error_explanation">
>> <h2><%= pluralize(@university.errors.count, "error")
%> prohibited this university from being saved:</h2>
>> 
>> <ul>
>> <% @university.errors.full_messages.each do |msg| %>
>> <li><%= msg %></li>
>> <% end %>
>> </ul>
>> </div>
>> <% end %>
>> 
>> <div class="field">
>> <%= f.label :name %><br />
>> <%= f.text_field :name %>
>> </div>
>> <div class="field">
>> <%= f.label :address %><br />
>> <%= f.text_field :address %>
>> </div>
>> <div class="field">
>> <%= f.label :country %><br />
>> <%= f.text_field :country %>
>> </div>
>> 
>> <% f.fields_for :resources do |builder| %>
You have to make sure that a resource has been built for it to show the fields,
otherwise the fields_for call will not display the form fields as there is not a
model Instance behind the fields. This is usually done by scoping a build
through the association.  For example if a university has a has_many association
named resources then somewhere in the controller or view you would have to make
a call similar to: @university.resources.build. This will create a new instance
of the resources model to be used by fields for.
>> <%= render "resources/form", :f => builder %>
>> <% end %>
>> <div class="actions">
>> <%= f.submit %>
>> </div>
>> <% end %>
>> 
>> Code from views/resources/_form:
>> 
>> 
>> <div class="field">
>> <%= f.label :subject %><br />
>> <%= f.text_field :subject %>
>> </div>
>> <div class="field">
>> <%= f.label :course %><br />
>> <%= f.text_field :course %>
>> </div>
>> <div class="field">
>> <%= f.label :alternative_use %><br />
>> <%= f.text_field :alternative_use %>
>> </div>
>> <div class="field">
>> <%= f.label :author %><br />
>> <%= f.text_field :author %>
>> </div>
>> <div class="field">
>> <%= f.label :resource_type %><br />
>> <%= f.text_field :resource_type %>
>> </div>
>> 
>> Code from models:
>> 
>>    class University < ActiveRecord::Base
>> has_many :resources
>> accepts_nested_attributes_for :resources, :allow_destroy => :true,
>>    :reject_if => proc { |attrs| attrs.all? { |k, v| v.blank? } }
>> attr_accessible :resource_attributes
>> end
>> 
>> class Resource < ActiveRecord::Base
>> #Defines the relationship between resource and user.
>> belongs_to :user
>> belongs_to :university
>> attr_accessible :resource_type, :subject, :author, :course,
:alternative_use,
>> #Need to add some more validation to the fields.
>> def self.search(search)
>>  if search
>>    find(:all, :conditions => [''subject LIKE ?'',
"%#{search}%"])
>>  else
>>    find(:all)
>>  end
>> end
>> #End class.
>> end
>> 
>> Thanks in advance,
>> Jen!
>> 
>> On 17/07/11 22:27, Barney wrote:
>>> Hello,
>>>      An earlier post where I asked how to put mulitple
tables''s input
>>> on one screen was answered with
"accepts_nested_attributes_for" and
>>> that seems to be what I need, but nothing appears on the screen for
>>> the nested section.  I''ve been using ideas from:
>>> 
>>>
http://masonoise.wordpress.com/2010/07/23/rails-and-forms-using-accepts_nested_attributes_for/
>>> http://railscasts.com/episodes/196-nested-model-form-part-1
>>> http://asciicasts.com/episodes/196-nested-model-form-part-1
>>>
http://api.rubyonrails.org/classes/ActiveRecord/NestedAttributes/ClassMethods.html#method-i-accepts_nested_attributes_for
>>> 
>>> The following are my classes and a little code from the
>>> "_form.html.erb" that I''m trying to make work:
>>> 
>>> class Person<  ActiveRecord::Base
>>>    default_scope :order =>  ''last_name''
>>>    has_many :people_skills
>>> 
>>>    accepts_nested_attributes_for :people_skills, :update_only =>
>>> true, :allow_destroy =>  true
>>> end
>>> 
>>> class PeopleSkill<  ActiveRecord::Base
>>>    belongs_to :person
>>> end
>>> 
>>> Also, there is a field in the people_skills table that is
person_id,
>>> which I remember reading in the "Agile.." book creates an
FK there.
>>> 
>>> <%= form_for(@person) do |f| %>
>>> <% if @person.errors.any? %>
>>>     # ... usual code concerning errors
>>> <% end %>
>>> 
>>> <%= f.fields_for :people_skills do |builder| %>
>>> <%= builder.label :skill, "Skill" %><br />
>>> <%= builder.text_field :skill %>
>>> </p>
>>> <p>
>>> <%= builder.label :competency, "Competency"
%><br />
>>> <%= builder.text_field :competency %>
>>> </p>
>>> <% end %>
>>> 
>>> <table>
>>> <tr>
>>> <td>
>>> <div class="field">
>>> <%= f.label :first_name %><br />
>>> <%= f.text_field :first_name %>
>>> </div>
>>> </td>
>>> <td>
>>> AND THEN MANY OTHER ROWS AND FIELDS OF THIS TABLE.
>>> 
>>> The table data for the class "Person" shows up fine, but
anything with
>>> the "f.fields_for..." is invisible (but doesn''t
cause a syntax
>> 
>> 
>>> error).  What DOES cause an error is to put
>>> "@Person.people_skills.build" in the "new"
method of
>>> people_controller.rb.
>>> 
>>> So, I''m looking for a way to have one screen which creates
entries in
>>> 2 tables, linked by the PK-FK.  What am I doing wrong or forgetting
to
>>> do?
>>>      Thanks,
>>>           Barney
>>> 
>> \
> 
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On Jul 19, 11:33 pm, Jen
<jen.bot...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> I forgot to mention that currently each of my tables is handled by a
> separate controller.
A controller is simply an entry/access point, you can pull in data
from any model in any controller and pass it to any view to be used.
>
> I thought this would be ok and anything entered in my resources _form
> partial would be handled by the ''resources'' controller
etc. However
No.

The form ''decides'' which controller to pass _all_ the form
data to,
you then need to ensure that the receiving controller saves/updates
the model and its relations.
> looking at the rails cast source code has confused me a bit, as it seems
> that all the tables are managed by one controller. Are my nested fields
Controllers don''t ''manage'' tables, they simply
collect model data and
pass it to a view, any required business logic should be handled by
the models. You should keep the code in your controllers to a minimum,
if you find that you are beginning to bloat your controller actions,
or start adding loads of private methods, then you need to look at
your code, and find a way to re-factor out into helpers or models or
lib modules etc.

For Example;

class ExamplesController < ApplicationController
  def show
    @example = Example.find(params[:id])
    @authors = Author.all
    render ''show''
  end
end

views/examples/show.html.erb
# This view can now display the example by accessing @example
# It can also display a list of authors of all the examples by
accessing @authors
# So you can create whatever data you want in your controller, and it
can be accessed in the view that is rendered.

> not rendering because the universities table and resources have their
> own totally separate controllers?
No.

You need to build any relations prior to rendering the view, you do
this in your new and edit actions in your controller.

Example:

class Person < ActiveRecord::Base
  belongs_to :address
  accepts_nested_attributes_for :address
end

class Address < ActiveRecord::Base
 has_many :people
 accepts_nested_attributes_for :people
end

class PeopleController < ApplicationController
  def new
    @person = Person.new
    @person.build_address
  end

  def edit
    @person = Person.find(params[:id])
    @person.build_address unless @person.address #don''t build an
address if the person already has one
  end
end

class AddressController < ApplicationController
  def new
    @address = Address.new
    @address.people.build
  end

  # This is untested, I haven''t needed to set up a nested form for a
model that has a has_many relation
  def edit
    @address = Address.find(params[:id])
    @address.people.build unless @address.people.size > 0 #don''t
build
people if the address already has people
  end
end

Also, if you take a look at your Resources form, unless you have
removed some of the code, it is not a form, just a list of fields for
a form. If you try and use that partial on it''s own, you will not be
able to.

When I want to re-use form fields in other forms, I move the fields
out into a separate partial and render it as you have done in your
University form. The only difference, is that I create an assets
folder in the relevant view folder for any additional ''out of the
norm'' views/partials. Surprisingly, I call the partial
_form_fields..... Then, both the University form, and the resources
form can both use the same views/resources/assets/
_form_fields.html.erb partial.

The fields can then be used by any other nested form. So, if you
decide to add another model that utilises the resources model, you can
easily create another nested form by calling in the resources
_form_fields partial.

HTH

Paul
>
> I will be experimenting with this more tomorrow. If someone could
> clarify this point about the controllers it would really help.
>
> Thanks,
> Jen!
>
> On 19/07/11 16:49, Jen wrote:
>
>
>
> >     Hi Barney,
>
> > I believe I am having the same problem you experienced, though my code
> > is a little different. If you or anyone else can tell me how to solve
> > it that would be great!
>
> > I am creating a db of Universities and resources. One University can
> > have many resources, but one resource can only come from one
> > University. I am trying to create a form with nested attributes, so
> > hat users wil be encouraged to give details about the University where
> > the resource comes from.
>
> > Code from views/universities/_form:
>
> > <%= form_for(@university) do |f| %>
> > <% if @university.errors.any? %>
> > <div id="error_explanation">
> > <h2><%= pluralize(@university.errors.count,
"error") %> prohibited
> > this university from being saved:</h2>
>
> > <ul>
> > <% @university.errors.full_messages.each do |msg| %>
> > <li><%= msg %></li>
> > <% end %>
> > </ul>
> > </div>
> > <% end %>
>
> > <div class="field">
> > <%= f.label :name %><br />
> > <%= f.text_field :name %>
> > </div>
> > <div class="field">
> > <%= f.label :address %><br />
> > <%= f.text_field :address %>
> > </div>
> > <div class="field">
> > <%= f.label :country %><br />
> > <%= f.text_field :country %>
> > </div>
>
> > <% f.fields_for :resources do |builder| %>
> > <%= render "resources/form", :f => builder %>
> > <% end %>
> > <div class="actions">
> > <%= f.submit %>
> > </div>
> > <% end %>
>
> > Code from views/resources/_form:
>
> > <div class="field">
> > <%= f.label :subject %><br />
> > <%= f.text_field :subject %>
> > </div>
> > <div class="field">
> > <%= f.label :course %><br />
> > <%= f.text_field :course %>
> > </div>
> > <div class="field">
> > <%= f.label :alternative_use %><br />
> > <%= f.text_field :alternative_use %>
> > </div>
> > <div class="field">
> > <%= f.label :author %><br />
> > <%= f.text_field :author %>
> > </div>
> > <div class="field">
> > <%= f.label :resource_type %><br />
> > <%= f.text_field :resource_type %>
> > </div>
>
> > Code from models:
>
> >     class University < ActiveRecord::Base
> > has_many :resources
> > accepts_nested_attributes_for :resources, :allow_destroy => :true,
> >     :reject_if => proc { |attrs| attrs.all? { |k, v| v.blank? } }
> > attr_accessible :resource_attributes
> > end
>
> > class Resource < ActiveRecord::Base
> > #Defines the relationship between resource and user.
> > belongs_to :user
> > belongs_to :university
> > attr_accessible :resource_type, :subject, :author, :course,
> > :alternative_use,
> > #Need to add some more validation to the fields.
> > def self.search(search)
> >   if search
> >     find(:all, :conditions => [''subject LIKE ?'',
"%#{search}%"])
> >   else
> >     find(:all)
> >   end
> > end
> > #End class.
> > end
>
> > Thanks in advance,
> > Jen!
>
> > On 17/07/11 22:27, Barney wrote:
> >> Hello,
> >>       An earlier post where I asked how to put mulitple
tables''s input
> >> on one screen was answered with
"accepts_nested_attributes_for" and
> >> that seems to be what I need, but nothing appears on the screen
for
> >> the nested section.  I''ve been using ideas from:
>
>
>>http://masonoise.wordpress.com/2010/07/23/rails-and-forms-using-accep...
>
> >>http://railscasts.com/episodes/196-nested-model-form-part-1
> >>http://asciicasts.com/episodes/196-nested-model-form-part-1
>
>>http://api.rubyonrails.org/classes/ActiveRecord/NestedAttributes/Clas...
>
> >> The following are my classes and a little code from the
> >> "_form.html.erb" that I''m trying to make work:
>
> >> class Person<  ActiveRecord::Base
> >>     default_scope :order =>  ''last_name''
> >>     has_many :people_skills
>
> >>     accepts_nested_attributes_for :people_skills, :update_only
=>
> >> true, :allow_destroy =>  true
> >> end
>
> >> class PeopleSkill<  ActiveRecord::Base
> >>     belongs_to :person
> >> end
>
> >> Also, there is a field in the people_skills table that is
person_id,
> >> which I remember reading in the "Agile.." book creates
an FK there.
>
> >> <%= form_for(@person) do |f| %>
> >> <% if @person.errors.any? %>
> >>      # ... usual code concerning errors
> >> <% end %>
>
> >> <%= f.fields_for :people_skills do |builder| %>
> >> <%= builder.label :skill, "Skill" %><br />
> >> <%= builder.text_field :skill %>
> >> </p>
> >> <p>
> >> <%= builder.label :competency, "Competency"
%><br />
> >> <%= builder.text_field :competency %>
> >> </p>
> >> <% end %>
>
> >> <table>
> >> <tr>
> >> <td>
> >> <div class="field">
> >> <%= f.label :first_name %><br />
> >> <%= f.text_field :first_name %>
> >> </div>
> >> </td>
> >> <td>
> >> AND THEN MANY OTHER ROWS AND FIELDS OF THIS TABLE.
>
> >> The table data for the class "Person" shows up fine, but
anything with
> >> the "f.fields_for..." is invisible (but doesn''t
cause a syntax
>
> >> error).  What DOES cause an error is to put
> >> "@Person.people_skills.build" in the "new"
method of
> >> people_controller.rb.
>
> >> So, I''m looking for a way to have one screen which
creates entries in
> >> 2 tables, linked by the PK-FK.  What am I doing wrong or
forgetting to
> >> do?
> >>       Thanks,
> >>            Barney
>
> > \
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Hi Paul,
Thanks for the reply!

Am I correct in thinking that for the data my user enters in the fields 
relating to resources to be inserted in to the resources table I need to 
render a complete form, not just a list of fields?

I have tried this approach and am receiving the following error:


  NoMethodError in Universities#new

Showing 
//home/resource_portal/website/app/views/resources/_form.html.erb/ where 
line *#1* raised:

|undefined method `model_name'' for NilClass:Class|

Extracted source (around line *#1*):

|1:<%= form_for(@resource) do |f| %>
2:<% if @resource.errors.any? %>
3:<div id="error_explanation">
4:<h2><%= pluralize(@resource.errors.count, "error") %> 
prohibited this resource from being saved:</h2>
|

Trace of template inclusion: app/views/universities/_form.html.erb, 
app/views/universities/new.html.erb

||

Any further assistance with this would be great.

Thanks in advance,
Jen!
On 20/07/11 15:54, paul h wrote:
>
> On Jul 19, 11:33 pm,
Jen<jen.bot...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>  wrote:
>> I forgot to mention that currently each of my tables is handled by a
>> separate controller.
> A controller is simply an entry/access point, you can pull in data
> from any model in any controller and pass it to any view to be used.
>
>> I thought this would be ok and anything entered in my resources _form
>> partial would be handled by the ''resources''
controller etc. However
> No.
>
> The form ''decides'' which controller to pass _all_ the
form data to,
> you then need to ensure that the receiving controller saves/updates
> the model and its relations.
>
>> looking at the rails cast source code has confused me a bit, as it
seems
>> that all the tables are managed by one controller. Are my nested fields
> Controllers don''t ''manage'' tables, they simply
collect model data and
> pass it to a view, any required business logic should be handled by
> the models. You should keep the code in your controllers to a minimum,
> if you find that you are beginning to bloat your controller actions,
> or start adding loads of private methods, then you need to look at
> your code, and find a way to re-factor out into helpers or models or
> lib modules etc.
>
> For Example;
>
> class ExamplesController<  ApplicationController
>    def show
>      @example = Example.find(params[:id])
>      @authors = Author.all
>      render ''show''
>    end
> end
>
> views/examples/show.html.erb
> # This view can now display the example by accessing @example
> # It can also display a list of authors of all the examples by
> accessing @authors
> # So you can create whatever data you want in your controller, and it
> can be accessed in the view that is rendered.
>
>
>> not rendering because the universities table and resources have their
>> own totally separate controllers?
> No.
>
> You need to build any relations prior to rendering the view, you do
> this in your new and edit actions in your controller.
>
> Example:
>
> class Person<  ActiveRecord::Base
>    belongs_to :address
>    accepts_nested_attributes_for :address
> end
>
> class Address<  ActiveRecord::Base
>   has_many :people
>   accepts_nested_attributes_for :people
> end
>
> class PeopleController<  ApplicationController
>    def new
>      @person = Person.new
>      @person.build_address
>    end
>
>    def edit
>      @person = Person.find(params[:id])
>      @person.build_address unless @person.address #don''t build an
> address if the person already has one
>    end
> end
>
> class AddressController<  ApplicationController
>    def new
>      @address = Address.new
>      @address.people.build
>    end
>
>    # This is untested, I haven''t needed to set up a nested form
for a
> model that has a has_many relation
>    def edit
>      @address = Address.find(params[:id])
>      @address.people.build unless @address.people.size>  0
#don''t build
> people if the address already has people
>    end
> end
>
> Also, if you take a look at your Resources form, unless you have
> removed some of the code, it is not a form, just a list of fields for
> a form. If you try and use that partial on it''s own, you will not
be
> able to.
>
> When I want to re-use form fields in other forms, I move the fields
> out into a separate partial and render it as you have done in your
> University form. The only difference, is that I create an assets
> folder in the relevant view folder for any additional ''out of the
> norm'' views/partials. Surprisingly, I call the partial
> _form_fields..... Then, both the University form, and the resources
> form can both use the same views/resources/assets/
> _form_fields.html.erb partial.
>
> The fields can then be used by any other nested form. So, if you
> decide to add another model that utilises the resources model, you can
> easily create another nested form by calling in the resources
> _form_fields partial.
>
> HTH
>
> Paul
>> I will be experimenting with this more tomorrow. If someone could
>> clarify this point about the controllers it would really help.
>>
>> Thanks,
>> Jen!
>>
>> On 19/07/11 16:49, Jen wrote:
>>
>>
>>
>>>      Hi Barney,
>>> I believe I am having the same problem you experienced, though my
code
>>> is a little different. If you or anyone else can tell me how to
solve
>>> it that would be great!
>>> I am creating a db of Universities and resources. One University
can
>>> have many resources, but one resource can only come from one
>>> University. I am trying to create a form with nested attributes, so
>>> hat users wil be encouraged to give details about the University
where
>>> the resource comes from.
>>> Code from views/universities/_form:
>>> <%= form_for(@university) do |f| %>
>>> <% if @university.errors.any? %>
>>> <div id="error_explanation">
>>> <h2><%= pluralize(@university.errors.count,
"error") %>  prohibited
>>> this university from being saved:</h2>
>>> <ul>
>>> <% @university.errors.full_messages.each do |msg| %>
>>> <li><%= msg %></li>
>>> <% end %>
>>> </ul>
>>> </div>
>>> <% end %>
>>> <div class="field">
>>> <%= f.label :name %><br />
>>> <%= f.text_field :name %>
>>> </div>
>>> <div class="field">
>>> <%= f.label :address %><br />
>>> <%= f.text_field :address %>
>>> </div>
>>> <div class="field">
>>> <%= f.label :country %><br />
>>> <%= f.text_field :country %>
>>> </div>
>>> <% f.fields_for :resources do |builder| %>
>>> <%= render "resources/form", :f =>  builder %>
>>> <% end %>
>>> <div class="actions">
>>> <%= f.submit %>
>>> </div>
>>> <% end %>
>>> Code from views/resources/_form:
>>> <div class="field">
>>> <%= f.label :subject %><br />
>>> <%= f.text_field :subject %>
>>> </div>
>>> <div class="field">
>>> <%= f.label :course %><br />
>>> <%= f.text_field :course %>
>>> </div>
>>> <div class="field">
>>> <%= f.label :alternative_use %><br />
>>> <%= f.text_field :alternative_use %>
>>> </div>
>>> <div class="field">
>>> <%= f.label :author %><br />
>>> <%= f.text_field :author %>
>>> </div>
>>> <div class="field">
>>> <%= f.label :resource_type %><br />
>>> <%= f.text_field :resource_type %>
>>> </div>
>>> Code from models:
>>>      class University<  ActiveRecord::Base
>>> has_many :resources
>>> accepts_nested_attributes_for :resources, :allow_destroy => 
:true,
>>>      :reject_if =>  proc { |attrs| attrs.all? { |k, v| v.blank?
} }
>>> attr_accessible :resource_attributes
>>> end
>>> class Resource<  ActiveRecord::Base
>>> #Defines the relationship between resource and user.
>>> belongs_to :user
>>> belongs_to :university
>>> attr_accessible :resource_type, :subject, :author, :course,
>>> :alternative_use,
>>> #Need to add some more validation to the fields.
>>> def self.search(search)
>>>    if search
>>>      find(:all, :conditions =>  [''subject LIKE
?'', "%#{search}%"])
>>>    else
>>>      find(:all)
>>>    end
>>> end
>>> #End class.
>>> end
>>> Thanks in advance,
>>> Jen!
>>> On 17/07/11 22:27, Barney wrote:
>>>> Hello,
>>>>        An earlier post where I asked how to put mulitple
tables''s input
>>>> on one screen was answered with
"accepts_nested_attributes_for" and
>>>> that seems to be what I need, but nothing appears on the screen
for
>>>> the nested section.  I''ve been using ideas from:
>>>>
http://masonoise.wordpress.com/2010/07/23/rails-and-forms-using-accep...
>>>> http://railscasts.com/episodes/196-nested-model-form-part-1
>>>> http://asciicasts.com/episodes/196-nested-model-form-part-1
>>>>
http://api.rubyonrails.org/classes/ActiveRecord/NestedAttributes/Clas...
>>>> The following are my classes and a little code from the
>>>> "_form.html.erb" that I''m trying to make
work:
>>>> class Person<    ActiveRecord::Base
>>>>      default_scope :order =>   
''last_name''
>>>>      has_many :people_skills
>>>>      accepts_nested_attributes_for :people_skills, :update_only
=>
>>>> true, :allow_destroy =>    true
>>>> end
>>>> class PeopleSkill<    ActiveRecord::Base
>>>>      belongs_to :person
>>>> end
>>>> Also, there is a field in the people_skills table that is
person_id,
>>>> which I remember reading in the "Agile.." book
creates an FK there.
>>>> <%= form_for(@person) do |f| %>
>>>> <% if @person.errors.any? %>
>>>>       # ... usual code concerning errors
>>>> <% end %>
>>>> <%= f.fields_for :people_skills do |builder| %>
>>>> <%= builder.label :skill, "Skill" %><br
/>
>>>> <%= builder.text_field :skill %>
>>>> </p>
>>>> <p>
>>>> <%= builder.label :competency, "Competency"
%><br />
>>>> <%= builder.text_field :competency %>
>>>> </p>
>>>> <% end %>
>>>> <table>
>>>> <tr>
>>>> <td>
>>>> <div class="field">
>>>> <%= f.label :first_name %><br />
>>>> <%= f.text_field :first_name %>
>>>> </div>
>>>> </td>
>>>> <td>
>>>> AND THEN MANY OTHER ROWS AND FIELDS OF THIS TABLE.
>>>> The table data for the class "Person" shows up fine,
but anything with
>>>> the "f.fields_for..." is invisible (but
doesn''t cause a syntax
>>>> error).  What DOES cause an error is to put
>>>> "@Person.people_skills.build" in the "new"
method of
>>>> people_controller.rb.
>>>> So, I''m looking for a way to have one screen which
creates entries in
>>>> 2 tables, linked by the PK-FK.  What am I doing wrong or
forgetting to
>>>> do?
>>>>        Thanks,
>>>>             Barney
>>> \
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On 21 July 2011 09:29, Jen
<jen.bottom-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> Hi Paul,
> Thanks for the reply!
>
> Am I correct in thinking that for the data my user enters in the fields
> relating to resources to be inserted in to the resources table I need to
> render a complete form, not just a list of fields?
>
> I have tried this approach and am receiving the following error:
>
> NoMethodError in Universities#new
>
> Showing /home/resource_portal/website/app/views/resources/_form.html.erb
> where line #1 raised:
>
> undefined method `model_name'' for NilClass:Class
>
> Extracted source (around line #1):
>
> 1: <%= form_for(@resource) do |f| %>
The error simply means that @resource is nil.  If you set this in the
controller using find then maybe the find did not find a matching
record.

Colin

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Hi Colin,
I can''t see anything in my controller that indicates I have set 
@resource to nil.
When I go directly to the resources form it renders fine and I can add 
data about new resources. It''s just when trying to render the form as a
partial within the universities/_form view.

Do I need to add something in the ''universities_controller''
that gives
@resource a value. Perhaps ''@resource = Resource.new''?

Below is the code from the ''universities_controller'' so far:

class UniversitiesController < ApplicationController
#insure users are signed in before viewing these pages
before_filter :authenticate

   # GET /universities
   # GET /universities.xml
   def index
     @universities = University.all

     respond_to do |format|
       format.html # index.html.erb
       format.xml  { render :xml => @universities }
     end
   end

   # GET /universities/1
   # GET /universities/1.xml
   def show
     @university = University.find(params[:id])

     respond_to do |format|
       format.html # show.html.erb
       format.xml  { render :xml => @university }
     end
   end

   # GET /universities/new
   # GET /universities/new.xml
   def new
     @university = University.new

     respond_to do |format|
       format.html # new.html.erb
       format.xml  { render :xml => @university }
resource = @university.resources.build

     end
   end

   # GET /universities/1/edit
   def edit
     @university = University.find(params[:id])
   end

   # POST /universities
   # POST /universities.xml
   def create
     @university = University.new(params[:university])

     respond_to do |format|
       if @university.save
         format.html { redirect_to(@university, :notice =>
''University
was successfully created.'') }
         format.xml  { render :xml => @university, :status => :created, 
:location => @university }
       else
         format.html { render :action => "new" }
         format.xml  { render :xml => @university.errors, :status => 
:unprocessable_entity }
       end
     end
   end

   # PUT /universities/1
   # PUT /universities/1.xml
   def update
     @university = University.find(params[:id])

     respond_to do |format|
       if @university.update_attributes(params[:university])
         format.html { redirect_to(@university, :notice =>
''University
was successfully updated.'') }
         format.xml  { head :ok }
       else
         format.html { render :action => "edit" }
         format.xml  { render :xml => @university.errors, :status => 
:unprocessable_entity }
       end
     end
   end

   # DELETE /universities/1
   # DELETE /universities/1.xml
   def destroy
     @university = University.find(params[:id])
     @university.destroy

     respond_to do |format|
       format.html { redirect_to(universities_url) }
       format.xml  { head :ok }
     end
   end
end

Thanks,
Jen.

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On 21 July 2011 11:55, Jen
<jen.bottom-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:

Please don''t top post, it makes it difficult to follow the thread.
Insert your reply at appropriate point(s) in previous post.  Thanks.
> Hi Colin,
> I can''t see anything in my controller that indicates I have set
@resource to
> nil.
> When I go directly to the resources form it renders fine and I can add data
> about new resources. It''s just when trying to render the form as a
partial
> within the universities/_form view.
I had missed the fact that you were in a partial.  Have a look at the
Rails Guide on Layouts and Rendering, specifically the section on
using partials and passing values to it.

If you have not already done so, also have a good look the other
guides, it will be time well spent.


Colin
>
> Do I need to add something in the
''universities_controller'' that gives
> @resource a value. Perhaps ''@resource = Resource.new''?
>
> Below is the code from the ''universities_controller'' so
far:
>
> class UniversitiesController < ApplicationController
> #insure users are signed in before viewing these pages
> before_filter :authenticate
>
>  # GET /universities
>  # GET /universities.xml
>  def index
>    @universities = University.all
>
>    respond_to do |format|
>      format.html # index.html.erb
>      format.xml  { render :xml => @universities }
>    end
>  end
>
>  # GET /universities/1
>  # GET /universities/1.xml
>  def show
>    @university = University.find(params[:id])
>
>    respond_to do |format|
>      format.html # show.html.erb
>      format.xml  { render :xml => @university }
>    end
>  end
>
>  # GET /universities/new
>  # GET /universities/new.xml
>  def new
>    @university = University.new
>
>    respond_to do |format|
>      format.html # new.html.erb
>      format.xml  { render :xml => @university }
> resource = @university.resources.build
>
>    end
>  end
>
>  # GET /universities/1/edit
>  def edit
>    @university = University.find(params[:id])
>  end
>
>  # POST /universities
>  # POST /universities.xml
>  def create
>    @university = University.new(params[:university])
>
>    respond_to do |format|
>      if @university.save
>        format.html { redirect_to(@university, :notice =>
''University was
> successfully created.'') }
>        format.xml  { render :xml => @university, :status => :created,
> :location => @university }
>      else
>        format.html { render :action => "new" }
>        format.xml  { render :xml => @university.errors, :status =>
> :unprocessable_entity }
>      end
>    end
>  end
>
>  # PUT /universities/1
>  # PUT /universities/1.xml
>  def update
>    @university = University.find(params[:id])
>
>    respond_to do |format|
>      if @university.update_attributes(params[:university])
>        format.html { redirect_to(@university, :notice =>
''University was
> successfully updated.'') }
>        format.xml  { head :ok }
>      else
>        format.html { render :action => "edit" }
>        format.xml  { render :xml => @university.errors, :status =>
> :unprocessable_entity }
>      end
>    end
>  end
>
>  # DELETE /universities/1
>  # DELETE /universities/1.xml
>  def destroy
>    @university = University.find(params[:id])
>    -E0jTjEqft5ObEF0i2MPMWwS+D6j9UgRo@public.gmane.org
>
>    respond_to do |format|
>      format.html { redirect_to(universities_url) }
>      format.xml  { head :ok }
>    end
>  end
> end
>
> Thanks,
> Jen.
>
> --
> You received this message because you are subscribed to the Google Groups
> "Ruby on Rails: Talk" group.
> To post to this group, send email to
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>
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Hi,
After getting nowhere I decided to follow this article:

http://ryandaigle.com/articles/2009/2/1/what-s-new-in-edge-rails-nested-attributes

This meant replicating some already existing fields in my 
universities/_form, but I felt it would atleast rule out the possibility 
I was doing something silly with partials. Now I am receiving the 
following error:

NoMethodError in Universities#new

Showing 
/home/resource_portal/website/app/views/universities/_form.html.erb 
where line #26 raised:

undefined method `fields_for'' for nil:NilClass

Extracted source (around line #26):

23: <%= f.label :country %><br />
24: <%= f.text_field :country %>
25: </div>
26: <%= form.fields_for :resources do |resource| %>
27: <%= f.label :resource_type %><br />
28: <%= f.text_field :resource_type %>
29: </div>

Trace of template inclusion: app/views/universities/new.html.erb

Rails.root: /home/resource_portal/website
Application Trace | Framework Trace | Full Trace

rake-0.8.7/ruby/1.9.1/gems/activesupport-3.0.3/lib/active_support/whiny_nil.rb:48:in
`method_missing''

My code for the models, universities controller and view is attached. 
Can someone please point out what I am doing wrong? I have read many 
articles, posts and have tried many variations to achieve this. Do I 
need to set @resources and @universities to equal some value before 
rendering the form?

Code for controller:

class UniversitiesController < ApplicationController
#insure users are signed in before viewing these pages
before_filter :authenticate

   # GET /universities
   # GET /universities.xml
   def index
     @universities = University.all

     respond_to do |format|
       format.html # index.html.erb
       format.xml  { render :xml => @universities }
     end
   end

   # GET /universities/1
   # GET /universities/1.xml
   def show
     @university = University.find(params[:id])

     respond_to do |format|
       format.html # show.html.erb
       format.xml  { render :xml => @university }
     end
   end

   # GET /universities/new
   # GET /universities/new.xml
   def new
     @university = University.new
@resource = @university.resources.build
     respond_to do |format|
       format.html # new.html.erb
       format.xml  { render :xml => @university }

     end
   end

   # GET /universities/1/edit
   def edit
     @university = University.find(params[:id])
   end

   # POST /universities
   # POST /universities.xml
   def create
     @university = University.new(params[:university])

     respond_to do |format|
       if @university.save
         format.html { redirect_to(@university, :notice =>
''University
was successfully created.'') }
         format.xml  { render :xml => @university, :status => :created, 
:location => @university }
       else
         format.html { render :action => "new" }
         format.xml  { render :xml => @university.errors, :status => 
:unprocessable_entity }
       end
     end
   end

   # PUT /universities/1
   # PUT /universities/1.xml
   def update
     @university = University.find(params[:id])

     respond_to do |format|
       if @university.update_attributes(params[:university])
         format.html { redirect_to(@university, :notice =>
''University
was successfully updated.'') }
         format.xml  { head :ok }
       else
         format.html { render :action => "edit" }
         format.xml  { render :xml => @university.errors, :status => 
:unprocessable_entity }
       end
     end
   end

   # DELETE /universities/1
   # DELETE /universities/1.xml
   def destroy
     @university = University.find(params[:id])
     @university.destroy

     respond_to do |format|
       format.html { redirect_to(universities_url) }
       format.xml  { head :ok }
     end
   end
end

Code for models:

class University < ActiveRecord::Base
has_many :resources
accepts_nested_attributes_for :resources, :allow_destroy => :true,
     :reject_if => proc { |attrs| attrs.all? { |k, v| v.blank? } }
attr_accessible :resource_attributes
end

class Resource < ActiveRecord::Base
#Defines the relationship between resource and user.
belongs_to :user
belongs_to :university
attr_accessible :resource_type, :subject, :author, :course, 
:alternative_use,
#Need to add some more validation to the fields.
def self.search(search)
   if search
     find(:all, :conditions => [''subject LIKE ?'',
"%#{search}%"])
#Join tables here

   else
     find(:all)
   end
end
#End class.
end

Code for views:

<%= form_for(@university) do |f| %>
<% if @university.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(@university.errors.count, "error") %>
prohibited this
university from being saved:</h2>

<ul>
<% @university.errors.full_messages.each do |msg| %>
<li><%= msg %></li>
<% end %>
</ul>
</div>
<% end %>

<div class="field">
<%= f.label :name %><br />
<%= f.text_field :name %>
</div>
<div class="field">
<%= f.label :address %><br />
<%= f.text_field :address %>
</div>
<div class="field">
<%= f.label :country %><br />
<%= f.text_field :country %>
</div>
<%= form.fields_for :resources do |resource| %>
<%= f.label :resource_type %><br />
<%= f.text_field :resource_type %>
</div>
<% end %>
<div class="actions">
<%= f.submit %>
</div>
<% end %>

<h1>New university</h1>

<%= render ''form'' %>
<ul>
<li> <%= link_to ''Back'', universities_path %>
</li>
</ul>

Thanks in advance for any further assistance,
Jen.
On 21/07/11 12:11, Colin Law wrote:
> On 21 July 2011 11:55,
Jen<jen.bottom-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>  wrote:
>
> Please don''t top post, it makes it difficult to follow the thread.
> Insert your reply at appropriate point(s) in previous post.  Thanks.
>
>> Hi Colin,
>> I can''t see anything in my controller that indicates I have
set @resource to
>> nil.
>> When I go directly to the resources form it renders fine and I can add
data
>> about new resources. It''s just when trying to render the form
as a partial
>> within the universities/_form view.
> I had missed the fact that you were in a partial.  Have a look at the
> Rails Guide on Layouts and Rendering, specifically the section on
> using partials and passing values to it.
>
> If you have not already done so, also have a good look the other
> guides, it will be time well spent.
>
>
> Colin
>
>> Do I need to add something in the
''universities_controller'' that gives
>> @resource a value. Perhaps ''@resource =
Resource.new''?
>>
>> Below is the code from the ''universities_controller''
so far:
>>
>> class UniversitiesController<  ApplicationController
>> #insure users are signed in before viewing these pages
>> before_filter :authenticate
>>
>>   # GET /universities
>>   # GET /universities.xml
>>   def index
>>     @universities = University.all
>>
>>     respond_to do |format|
>>       format.html # index.html.erb
>>       format.xml  { render :xml =>  @universities }
>>     end
>>   end
>>
>>   # GET /universities/1
>>   # GET /universities/1.xml
>>   def show
>>     @university = University.find(params[:id])
>>
>>     respond_to do |format|
>>       format.html # show.html.erb
>>       format.xml  { render :xml =>  @university }
>>     end
>>   end
>>
>>   # GET /universities/new
>>   # GET /universities/new.xml
>>   def new
>>     @university = University.new
>>
>>     respond_to do |format|
>>       format.html # new.html.erb
>>       format.xml  { render :xml =>  @university }
>> resource = @university.resources.build
>>
>>     end
>>   end
>>
>>   # GET /universities/1/edit
>>   def edit
>>     @university = University.find(params[:id])
>>   end
>>
>>   # POST /universities
>>   # POST /universities.xml
>>   def create
>>     @university = University.new(params[:university])
>>
>>     respond_to do |format|
>>       if @university.save
>>         format.html { redirect_to(@university, :notice => 
''University was
>> successfully created.'') }
>>         format.xml  { render :xml =>  @university, :status => 
:created,
>> :location =>  @university }
>>       else
>>         format.html { render :action =>  "new" }
>>         format.xml  { render :xml =>  @university.errors, :status
=>
>> :unprocessable_entity }
>>       end
>>     end
>>   end
>>
>>   # PUT /universities/1
>>   # PUT /universities/1.xml
>>   def update
>>     @university = University.find(params[:id])
>>
>>     respond_to do |format|
>>       if @university.update_attributes(params[:university])
>>         format.html { redirect_to(@university, :notice => 
''University was
>> successfully updated.'') }
>>         format.xml  { head :ok }
>>       else
>>         format.html { render :action =>  "edit" }
>>         format.xml  { render :xml =>  @university.errors, :status
=>
>> :unprocessable_entity }
>>       end
>>     end
>>   end
>>
>>   # DELETE /universities/1
>>   # DELETE /universities/1.xml
>>   def destroy
>>     @university = University.find(params[:id])
>>     @university.destroy
>>
>>     respond_to do |format|
>>       format.html { redirect_to(universities_url) }
>>       format.xml  { head :ok }
>>     end
>>   end
>> end
>>
>> Thanks,
>> Jen.
>>
>> --
>> You received this message because you are subscribed to the Google
Groups
>> "Ruby on Rails: Talk" group.
>> To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
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>>
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>>
>>
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guy,

you''re using f.label, so then you have to use 

f.fields_for :something do |smth|
  smth.label :label, "description"
  smth.text_field

...

On Jul 21, 2011, at 16:49 , Jen wrote:
> Hi,
> After getting nowhere I decided to follow this article:
> 
>
http://ryandaigle.com/articles/2009/2/1/what-s-new-in-edge-rails-nested-attributes
> 
> This meant replicating some already existing fields in my
universities/_form, but I felt it would atleast rule out the possibility I was
doing something silly with partials. Now I am receiving the following error:
> 
> NoMethodError in Universities#new
> 
> Showing /home/resource_portal/website/app/views/universities/_form.html.erb
where line #26 raised:
> 
> undefined method `fields_for'' for nil:NilClass
> 
> Extracted source (around line #26):
> 
> 23: <%= f.label :country %><br />
> 24: <%= f.text_field :country %>
> 25: </div>
> 26: <%= form.fields_for :resources do |resource| %>
> 27: <%= f.label :resource_type %><br />
> 28: <%= f.text_field :resource_type %>
> 29: </div>
> 
> Trace of template inclusion: app/views/universities/new.html.erb
> 
> Rails.root: /home/resource_portal/website
> Application Trace | Framework Trace | Full Trace
> 
>
rake-0.8.7/ruby/1.9.1/gems/activesupport-3.0.3/lib/active_support/whiny_nil.rb:48:in
`method_missing''
> 
> My code for the models, universities controller and view is attached. Can
someone please point out what I am doing wrong? I have read many articles, posts
and have tried many variations to achieve this. Do I need to set @resources and
@universities to equal some value before rendering the form?
> 
> Code for controller:
> 
> class UniversitiesController < ApplicationController
> #insure users are signed in before viewing these pages
> before_filter :authenticate
> 
>  # GET /universities
>  # GET /universities.xml
>  def index
>    @universities = University.all
> 
>    respond_to do |format|
>      format.html # index.html.erb
>      format.xml  { render :xml => @universities }
>    end
>  end
> 
>  # GET /universities/1
>  # GET /universities/1.xml
>  def show
>    @university = University.find(params[:id])
> 
>    respond_to do |format|
>      format.html # show.html.erb
>      format.xml  { render :xml => @university }
>    end
>  end
> 
>  # GET /universities/new
>  # GET /universities/new.xml
>  def new
>    @university = University.new
> @resource = @university.resources.build
>    respond_to do |format|
>      format.html # new.html.erb
>      format.xml  { render :xml => @university }
> 
>    end
>  end
> 
>  # GET /universities/1/edit
>  def edit
>    @university = University.find(params[:id])
>  end
> 
>  # POST /universities
>  # POST /universities.xml
>  def create
>    @university = University.new(params[:university])
> 
>    respond_to do |format|
>      if @university.save
>        format.html { redirect_to(@university, :notice =>
''University was successfully created.'') }
>        format.xml  { render :xml => @university, :status => :created,
:location => @university }
>      else
>        format.html { render :action => "new" }
>        format.xml  { render :xml => @university.errors, :status =>
:unprocessable_entity }
>      end
>    end
>  end
> 
>  # PUT /universities/1
>  # PUT /universities/1.xml
>  def update
>    @university = University.find(params[:id])
> 
>    respond_to do |format|
>      if @university.update_attributes(params[:university])
>        format.html { redirect_to(@university, :notice =>
''University was successfully updated.'') }
>        format.xml  { head :ok }
>      else
>        format.html { render :action => "edit" }
>        format.xml  { render :xml => @university.errors, :status =>
:unprocessable_entity }
>      end
>    end
>  end
> 
>  # DELETE /universities/1
>  # DELETE /universities/1.xml
>  def destroy
>    @university = University.find(params[:id])
>    @university.destroy
> 
>    respond_to do |format|
>      format.html { redirect_to(universities_url) }
>      format.xml  { head :ok }
>    end
>  end
> end
> 
> Code for models:
> 
> class University < ActiveRecord::Base
> has_many :resources
> accepts_nested_attributes_for :resources, :allow_destroy => :true,
>    :reject_if => proc { |attrs| attrs.all? { |k, v| v.blank? } }
> attr_accessible :resource_attributes
> end
> 
> class Resource < ActiveRecord::Base
> #Defines the relationship between resource and user.
> belongs_to :user
> belongs_to :university
> attr_accessible :resource_type, :subject, :author, :course,
:alternative_use,
> #Need to add some more validation to the fields.
> def self.search(search)
>  if search
>    find(:all, :conditions => [''subject LIKE ?'',
"%#{search}%"])
> #Join tables here
> 
>  else
>    find(:all)
>  end
> end
> #End class.
> end
> 
> Code for views:
> 
> <%= form_for(@university) do |f| %>
> <% if @university.errors.any? %>
> <div id="error_explanation">
> <h2><%= pluralize(@university.errors.count, "error")
%> prohibited this university from being saved:</h2>
> 
> <ul>
> <% @university.errors.full_messages.each do |msg| %>
> <li><%= msg %></li>
> <% end %>
> </ul>
> </div>
> <% end %>
> 
> <div class="field">
> <%= f.label :name %><br />
> <%= f.text_field :name %>
> </div>
> <div class="field">
> <%= f.label :address %><br />
> <%= f.text_field :address %>
> </div>
> <div class="field">
> <%= f.label :country %><br />
> <%= f.text_field :country %>
> </div>
> <%= form.fields_for :resources do |resource| %>
> <%= f.label :resource_type %><br />
> <%= f.text_field :resource_type %>
> </div>
> <% end %>
> <div class="actions">
> <%= f.submit %>
> </div>
> <% end %>
> 
> <h1>New university</h1>
> 
> <%= render ''form'' %>
> <ul>
> <li> <%= link_to ''Back'', universities_path %>
</li>
> </ul>
> 
> Thanks in advance for any further assistance,
> Jen.
> On 21/07/11 12:11, Colin Law wrote:
>> On 21 July 2011 11:55,
Jen<jen.bottom-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>  wrote:
>> 
>> Please don''t top post, it makes it difficult to follow the
thread.
>> Insert your reply at appropriate point(s) in previous post.  Thanks.
>> 
>>> Hi Colin,
>>> I can''t see anything in my controller that indicates I
have set @resource to
>>> nil.
>>> When I go directly to the resources form it renders fine and I can
add data
>>> about new resources. It''s just when trying to render the
form as a partial
>>> within the universities/_form view.
>> I had missed the fact that you were in a partial.  Have a look at the
>> Rails Guide on Layouts and Rendering, specifically the section on
>> using partials and passing values to it.
>> 
>> If you have not already done so, also have a good look the other
>> guides, it will be time well spent.
>> 
>> 
>> Colin
>> 
>>> Do I need to add something in the
''universities_controller'' that gives
>>> @resource a value. Perhaps ''@resource =
Resource.new''?
>>> 
>>> Below is the code from the
''universities_controller'' so far:
>>> 
>>> class UniversitiesController<  ApplicationController
>>> #insure users are signed in before viewing these pages
>>> before_filter :authenticate
>>> 
>>>  # GET /universities
>>>  # GET /universities.xml
>>>  def index
>>>    @universities = University.all
>>> 
>>>    respond_to do |format|
>>>      format.html # index.html.erb
>>>      format.xml  { render :xml =>  @universities }
>>>    end
>>>  end
>>> 
>>>  # GET /universities/1
>>>  # GET /universities/1.xml
>>>  def show
>>>    @university = University.find(params[:id])
>>> 
>>>    respond_to do |format|
>>>      format.html # show.html.erb
>>>      format.xml  { render :xml =>  @university }
>>>    end
>>>  end
>>> 
>>>  # GET /universities/new
>>>  # GET /universities/new.xml
>>>  def new
>>>    @university = University.new
>>> 
>>>    respond_to do |format|
>>>      format.html # new.html.erb
>>>      format.xml  { render :xml =>  @university }
>>> resource = @university.resources.build
>>> 
>>>    end
>>>  end
>>> 
>>>  # GET /universities/1/edit
>>>  def edit
>>>    @university = University.find(params[:id])
>>>  end
>>> 
>>>  # POST /universities
>>>  # POST /universities.xml
>>>  def create
>>>    @university = University.new(params[:university])
>>> 
>>>    respond_to do |format|
>>>      if @university.save
>>>        format.html { redirect_to(@university, :notice => 
''University was
>>> successfully created.'') }
>>>        format.xml  { render :xml =>  @university, :status => 
:created,
>>> :location =>  @university }
>>>      else
>>>        format.html { render :action =>  "new" }
>>>        format.xml  { render :xml =>  @university.errors, :status
=>
>>> :unprocessable_entity }
>>>      end
>>>    end
>>>  end
>>> 
>>>  # PUT /universities/1
>>>  # PUT /universities/1.xml
>>>  def update
>>>    @university = University.find(params[:id])
>>> 
>>>    respond_to do |format|
>>>      if @university.update_attributes(params[:university])
>>>        format.html { redirect_to(@university, :notice => 
''University was
>>> successfully updated.'') }
>>>        format.xml  { head :ok }
>>>      else
>>>        format.html { render :action =>  "edit" }
>>>        format.xml  { render :xml =>  @university.errors, :status
=>
>>> :unprocessable_entity }
>>>      end
>>>    end
>>>  end
>>> 
>>>  # DELETE /universities/1
>>>  # DELETE /universities/1.xml
>>>  def destroy
>>>    @university = University.find(params[:id])
>>>    @university.destroy
>>> 
>>>    respond_to do |format|
>>>      format.html { redirect_to(universities_url) }
>>>      format.xml  { head :ok }
>>>    end
>>>  end
>>> end
>>> 
>>> Thanks,
>>> Jen.
>>> 
>>> --
>>> You received this message because you are subscribed to the Google
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>>> 
>>> 
> 
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On Jul 21, 2011, at 10:49 AM, Jen wrote:
> Hi,
> After getting nowhere I decided to follow this article:
> 
>
http://ryandaigle.com/articles/2009/2/1/what-s-new-in-edge-rails-nested-attributes
> 
> This meant replicating some already existing fields in my
universities/_form, but I felt it would atleast rule out the possibility I was
doing something silly with partials. Now I am receiving the following error:
> 
> NoMethodError in Universities#new
> 
> Showing /home/resource_portal/website/app/views/universities/_form.html.erb
where line #26 raised:
> 
> undefined method `fields_for'' for nil:NilClass
> 
> Extracted source (around line #26):
> 
> 23: <%= f.label :country %><br />
> 24: <%= f.text_field :country %>
> 25: </div>
> 26: <%= form.fields_for :resources do |resource| %>
You have form.fields_for here while all your other form fields refer to f and
your form_for defines |f|.  Change this line to f.fields_for and that should fix
your nil error
> 27: <%= f.label :resource_type %><br />
> 28: <%= f.text_field :resource_type %>
> 29: </div>
> 
> Trace of template inclusion: app/views/universities/new.html.erb
> 
> Rails.root: /home/resource_portal/website
> Application Trace | Framework Trace | Full Trace
> 
>
rake-0.8.7/ruby/1.9.1/gems/activesupport-3.0.3/lib/active_support/whiny_nil.rb:48:in
`method_missing''
> 
> My code for the models, universities controller and view is attached. Can
someone please point out what I am doing wrong? I have read many articles, posts
and have tried many variations to achieve this. Do I need to set @resources and
@universities to equal some value before rendering the form?
> 
> Code for controller:
> 
> class UniversitiesController < ApplicationController
> #insure users are signed in before viewing these pages
> before_filter :authenticate
> 
>  # GET /universities
>  # GET /universities.xml
>  def index
>    @universities = University.all
> 
>    respond_to do |format|
>      format.html # index.html.erb
>      format.xml  { render :xml => @universities }
>    end
>  end
> 
>  # GET /universities/1
>  # GET /universities/1.xml
>  def show
>    @university = University.find(params[:id])
> 
>    respond_to do |format|
>      format.html # show.html.erb
>      format.xml  { render :xml => @university }
>    end
>  end
> 
>  # GET /universities/new
>  # GET /universities/new.xml
>  def new
>    @university = University.new
> @resource = @university.resources.build
>    respond_to do |format|
>      format.html # new.html.erb
>      format.xml  { render :xml => @university }
> 
>    end
>  end
> 
>  # GET /universities/1/edit
>  def edit
>    @university = University.find(params[:id])
>  end
> 
>  # POST /universities
>  # POST /universities.xml
>  def create
>    @university = University.new(params[:university])
> 
>    respond_to do |format|
>      if @university.save
>        format.html { redirect_to(@university, :notice =>
''University was successfully created.'') }
>        format.xml  { render :xml => @university, :status => :created,
:location => @university }
>      else
>        format.html { render :action => "new" }
>        format.xml  { render :xml => @university.errors, :status =>
:unprocessable_entity }
>      end
>    end
>  end
> 
>  # PUT /universities/1
>  # PUT /universities/1.xml
>  def update
>    @university = University.find(params[:id])
> 
>    respond_to do |format|
>      if @university.update_attributes(params[:university])
>        format.html { redirect_to(@university, :notice =>
''University was successfully updated.'') }
>        format.xml  { head :ok }
>      else
>        format.html { render :action => "edit" }
>        format.xml  { render :xml => @university.errors, :status =>
:unprocessable_entity }
>      end
>    end
>  end
> 
>  # DELETE /universities/1
>  # DELETE /universities/1.xml
>  def destroy
>    @university = University.find(params[:id])
>    @university.destroy
> 
>    respond_to do |format|
>      format.html { redirect_to(universities_url) }
>      format.xml  { head :ok }
>    end
>  end
> end
> 
> Code for models:
> 
> class University < ActiveRecord::Base
> has_many :resources
> accepts_nested_attributes_for :resources, :allow_destroy => :true,
>    :reject_if => proc { |attrs| attrs.all? { |k, v| v.blank? } }
> attr_accessible :resource_attributes
> end
> 
> class Resource < ActiveRecord::Base
> #Defines the relationship between resource and user.
> belongs_to :user
> belongs_to :university
> attr_accessible :resource_type, :subject, :author, :course,
:alternative_use,
> #Need to add some more validation to the fields.
> def self.search(search)
>  if search
>    find(:all, :conditions => [''subject LIKE ?'',
"%#{search}%"])
> #Join tables here
> 
>  else
>    find(:all)
>  end
> end
> #End class.
> end
> 
> Code for views:
> 
> <%= form_for(@university) do |f| %>
> <% if @university.errors.any? %>
> <div id="error_explanation">
> <h2><%= pluralize(@university.errors.count, "error")
%> prohibited this university from being saved:</h2>
> 
> <ul>
> <% @university.errors.full_messages.each do |msg| %>
> <li><%= msg %></li>
> <% end %>
> </ul>
> </div>
> <% end %>
> 
> <div class="field">
> <%= f.label :name %><br />
> <%= f.text_field :name %>
> </div>
> <div class="field">
> <%= f.label :address %><br />
> <%= f.text_field :address %>
> </div>
> <div class="field">
> <%= f.label :country %><br />
> <%= f.text_field :country %>
> </div>
> <%= form.fields_for :resources do |resource| %>
> <%= f.label :resource_type %><br />
> <%= f.text_field :resource_type %>
> </div>
> <% end %>
> <div class="actions">
> <%= f.submit %>
> </div>
> <% end %>
> 
> <h1>New university</h1>
> 
> <%= render ''form'' %>
> <ul>
> <li> <%= link_to ''Back'', universities_path %>
</li>
> </ul>
> 
> Thanks in advance for any further assistance,
> Jen.
> On 21/07/11 12:11, Colin Law wrote:
>> On 21 July 2011 11:55,
Jen<jen.bottom-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>  wrote:
>> 
>> Please don''t top post, it makes it difficult to follow the
thread.
>> Insert your reply at appropriate point(s) in previous post.  Thanks.
>> 
>>> Hi Colin,
>>> I can''t see anything in my controller that indicates I
have set @resource to
>>> nil.
>>> When I go directly to the resources form it renders fine and I can
add data
>>> about new resources. It''s just when trying to render the
form as a partial
>>> within the universities/_form view.
>> I had missed the fact that you were in a partial.  Have a look at the
>> Rails Guide on Layouts and Rendering, specifically the section on
>> using partials and passing values to it.
>> 
>> If you have not already done so, also have a good look the other
>> guides, it will be time well spent.
>> 
>> 
>> Colin
>> 
>>> Do I need to add something in the
''universities_controller'' that gives
>>> @resource a value. Perhaps ''@resource =
Resource.new''?
>>> 
>>> Below is the code from the
''universities_controller'' so far:
>>> 
>>> class UniversitiesController<  ApplicationController
>>> #insure users are signed in before viewing these pages
>>> before_filter :authenticate
>>> 
>>>  # GET /universities
>>>  # GET /universities.xml
>>>  def index
>>>    @universities = University.all
>>> 
>>>    respond_to do |format|
>>>      format.html # index.html.erb
>>>      format.xml  { render :xml =>  @universities }
>>>    end
>>>  end
>>> 
>>>  # GET /universities/1
>>>  # GET /universities/1.xml
>>>  def show
>>>    @university = University.find(params[:id])
>>> 
>>>    respond_to do |format|
>>>      format.html # show.html.erb
>>>      format.xml  { render :xml =>  @university }
>>>    end
>>>  end
>>> 
>>>  # GET /universities/new
>>>  # GET /universities/new.xml
>>>  def new
>>>    @university = University.new
>>> 
>>>    respond_to do |format|
>>>      format.html # new.html.erb
>>>      format.xml  { render :xml =>  @university }
>>> resource = @university.resources.build
>>> 
>>>    end
>>>  end
>>> 
>>>  # GET /universities/1/edit
>>>  def edit
>>>    @university = University.find(params[:id])
>>>  end
>>> 
>>>  # POST /universities
>>>  # POST /universities.xml
>>>  def create
>>>    @university = University.new(params[:university])
>>> 
>>>    respond_to do |format|
>>>      if @university.save
>>>        format.html { redirect_to(@university, :notice => 
''University was
>>> successfully created.'') }
>>>        format.xml  { render :xml =>  @university, :status => 
:created,
>>> :location =>  @university }
>>>      else
>>>        format.html { render :action =>  "new" }
>>>        format.xml  { render :xml =>  @university.errors, :status
=>
>>> :unprocessable_entity }
>>>      end
>>>    end
>>>  end
>>> 
>>>  # PUT /universities/1
>>>  # PUT /universities/1.xml
>>>  def update
>>>    @university = University.find(params[:id])
>>> 
>>>    respond_to do |format|
>>>      if @university.update_attributes(params[:university])
>>>        format.html { redirect_to(@university, :notice => 
''University was
>>> successfully updated.'') }
>>>        format.xml  { head :ok }
>>>      else
>>>        format.html { render :action =>  "edit" }
>>>        format.xml  { render :xml =>  @university.errors, :status
=>
>>> :unprocessable_entity }
>>>      end
>>>    end
>>>  end
>>> 
>>>  # DELETE /universities/1
>>>  # DELETE /universities/1.xml
>>>  def destroy
>>>    @university = University.find(params[:id])
>>>    @university.destroy
>>> 
>>>    respond_to do |format|
>>>      format.html { redirect_to(universities_url) }
>>>      format.xml  { head :ok }
>>>    end
>>>  end
>>> end
>>> 
>>> Thanks,
>>> Jen.
>>> 
>>> --
>>> You received this message because you are subscribed to the Google
Groups
>>> "Ruby on Rails: Talk" group.
>>> To post to this group, send email to
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>>> 
>>> 
> 
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Hi, list.

Thanks for the help, nested forms working now.

Cheers,
Jen!


On 21/07/11 15:54, Juan Alvarado wrote:
> On Jul 21, 2011, at 10:49 AM, Jen wrote:
>
>> Hi,
>> After getting nowhere I decided to follow this article:
>>
>>
http://ryandaigle.com/articles/2009/2/1/what-s-new-in-edge-rails-nested-attributes
>>
>> This meant replicating some already existing fields in my
universities/_form, but I felt it would atleast rule out the possibility I was
doing something silly with partials. Now I am receiving the following error:
>>
>> NoMethodError in Universities#new
>>
>> Showing
/home/resource_portal/website/app/views/universities/_form.html.erb where line
#26 raised:
>>
>> undefined method `fields_for'' for nil:NilClass
>>
>> Extracted source (around line #26):
>>
>> 23:<%= f.label :country %><br />
>> 24:<%= f.text_field :country %>
>> 25:</div>
>> 26:<%= form.fields_for :resources do |resource| %>
> You have form.fields_for here while all your other form fields refer to f
and your form_for defines |f|.  Change this line to f.fields_for and that should
fix your nil error
>
>> 27:<%= f.label :resource_type %><br />
>> 28:<%= f.text_field :resource_type %>
>> 29:</div>
>>
>> Trace of template inclusion: app/views/universities/new.html.erb
>>
>> Rails.root: /home/resource_portal/website
>> Application Trace | Framework Trace | Full Trace
>>
>>
rake-0.8.7/ruby/1.9.1/gems/activesupport-3.0.3/lib/active_support/whiny_nil.rb:48:in
`method_missing''
>>
>> My code for the models, universities controller and view is attached.
Can someone please point out what I am doing wrong? I have read many articles,
posts and have tried many variations to achieve this. Do I need to set
@resources and @universities to equal some value before rendering the form?
>>
>> Code for controller:
>>
>> class UniversitiesController<  ApplicationController
>> #insure users are signed in before viewing these pages
>> before_filter :authenticate
>>
>>   # GET /universities
>>   # GET /universities.xml
>>   def index
>>     @universities = University.all
>>
>>     respond_to do |format|
>>       format.html # index.html.erb
>>       format.xml  { render :xml =>  @universities }
>>     end
>>   end
>>
>>   # GET /universities/1
>>   # GET /universities/1.xml
>>   def show
>>     @university = University.find(params[:id])
>>
>>     respond_to do |format|
>>       format.html # show.html.erb
>>       format.xml  { render :xml =>  @university }
>>     end
>>   end
>>
>>   # GET /universities/new
>>   # GET /universities/new.xml
>>   def new
>>     @university = University.new
>> @resource = @university.resources.build
>>     respond_to do |format|
>>       format.html # new.html.erb
>>       format.xml  { render :xml =>  @university }
>>
>>     end
>>   end
>>
>>   # GET /universities/1/edit
>>   def edit
>>     @university = University.find(params[:id])
>>   end
>>
>>   # POST /universities
>>   # POST /universities.xml
>>   def create
>>     @university = University.new(params[:university])
>>
>>     respond_to do |format|
>>       if @university.save
>>         format.html { redirect_to(@university, :notice => 
''University was successfully created.'') }
>>         format.xml  { render :xml =>  @university, :status => 
:created, :location =>  @university }
>>       else
>>         format.html { render :action =>  "new" }
>>         format.xml  { render :xml =>  @university.errors, :status
=>  :unprocessable_entity }
>>       end
>>     end
>>   end
>>
>>   # PUT /universities/1
>>   # PUT /universities/1.xml
>>   def update
>>     @university = University.find(params[:id])
>>
>>     respond_to do |format|
>>       if @university.update_attributes(params[:university])
>>         format.html { redirect_to(@university, :notice => 
''University was successfully updated.'') }
>>         format.xml  { head :ok }
>>       else
>>         format.html { render :action =>  "edit" }
>>         format.xml  { render :xml =>  @university.errors, :status
=>  :unprocessable_entity }
>>       end
>>     end
>>   end
>>
>>   # DELETE /universities/1
>>   # DELETE /universities/1.xml
>>   def destroy
>>     @university = University.find(params[:id])
>>     @university.destroy
>>
>>     respond_to do |format|
>>       format.html { redirect_to(universities_url) }
>>       format.xml  { head :ok }
>>     end
>>   end
>> end
>>
>> Code for models:
>>
>> class University<  ActiveRecord::Base
>> has_many :resources
>> accepts_nested_attributes_for :resources, :allow_destroy =>  :true,
>>     :reject_if =>  proc { |attrs| attrs.all? { |k, v| v.blank? } }
>> attr_accessible :resource_attributes
>> end
>>
>> class Resource<  ActiveRecord::Base
>> #Defines the relationship between resource and user.
>> belongs_to :user
>> belongs_to :university
>> attr_accessible :resource_type, :subject, :author, :course,
:alternative_use,
>> #Need to add some more validation to the fields.
>> def self.search(search)
>>   if search
>>     find(:all, :conditions =>  [''subject LIKE ?'',
"%#{search}%"])
>> #Join tables here
>>
>>   else
>>     find(:all)
>>   end
>> end
>> #End class.
>> end
>>
>> Code for views:
>>
>> <%= form_for(@university) do |f| %>
>> <% if @university.errors.any? %>
>> <div id="error_explanation">
>> <h2><%= pluralize(@university.errors.count, "error")
%>  prohibited this university from being saved:</h2>
>>
>> <ul>
>> <% @university.errors.full_messages.each do |msg| %>
>> <li><%= msg %></li>
>> <% end %>
>> </ul>
>> </div>
>> <% end %>
>>
>> <div class="field">
>> <%= f.label :name %><br />
>> <%= f.text_field :name %>
>> </div>
>> <div class="field">
>> <%= f.label :address %><br />
>> <%= f.text_field :address %>
>> </div>
>> <div class="field">
>> <%= f.label :country %><br />
>> <%= f.text_field :country %>
>> </div>
>> <%= form.fields_for :resources do |resource| %>
>> <%= f.label :resource_type %><br />
>> <%= f.text_field :resource_type %>
>> </div>
>> <% end %>
>> <div class="actions">
>> <%= f.submit %>
>> </div>
>> <% end %>
>>
>> <h1>New university</h1>
>>
>> <%= render ''form'' %>
>> <ul>
>> <li>  <%= link_to ''Back'', universities_path
%>  </li>
>> </ul>
>>
>> Thanks in advance for any further assistance,
>> Jen.
>> On 21/07/11 12:11, Colin Law wrote:
>>> On 21 July 2011 11:55,
Jen<jen.bottom-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>   wrote:
>>>
>>> Please don''t top post, it makes it difficult to follow the
thread.
>>> Insert your reply at appropriate point(s) in previous post. 
Thanks.
>>>
>>>> Hi Colin,
>>>> I can''t see anything in my controller that indicates I
have set @resource to
>>>> nil.
>>>> When I go directly to the resources form it renders fine and I
can add data
>>>> about new resources. It''s just when trying to render
the form as a partial
>>>> within the universities/_form view.
>>> I had missed the fact that you were in a partial.  Have a look at
the
>>> Rails Guide on Layouts and Rendering, specifically the section on
>>> using partials and passing values to it.
>>>
>>> If you have not already done so, also have a good look the other
>>> guides, it will be time well spent.
>>>
>>>
>>> Colin
>>>
>>>> Do I need to add something in the
''universities_controller'' that gives
>>>> @resource a value. Perhaps ''@resource =
Resource.new''?
>>>>
>>>> Below is the code from the
''universities_controller'' so far:
>>>>
>>>> class UniversitiesController<   ApplicationController
>>>> #insure users are signed in before viewing these pages
>>>> before_filter :authenticate
>>>>
>>>>   # GET /universities
>>>>   # GET /universities.xml
>>>>   def index
>>>>     @universities = University.all
>>>>
>>>>     respond_to do |format|
>>>>       format.html # index.html.erb
>>>>       format.xml  { render :xml =>   @universities }
>>>>     end
>>>>   end
>>>>
>>>>   # GET /universities/1
>>>>   # GET /universities/1.xml
>>>>   def show
>>>>     @university = University.find(params[:id])
>>>>
>>>>     respond_to do |format|
>>>>       format.html # show.html.erb
>>>>       format.xml  { render :xml =>   @university }
>>>>     end
>>>>   end
>>>>
>>>>   # GET /universities/new
>>>>   # GET /universities/new.xml
>>>>   def new
>>>>     @university = University.new
>>>>
>>>>     respond_to do |format|
>>>>       format.html # new.html.erb
>>>>       format.xml  { render :xml =>   @university }
>>>> resource = @university.resources.build
>>>>
>>>>     end
>>>>   end
>>>>
>>>>   # GET /universities/1/edit
>>>>   def edit
>>>>     @university = University.find(params[:id])
>>>>   end
>>>>
>>>>   # POST /universities
>>>>   # POST /universities.xml
>>>>   def create
>>>>     @university = University.new(params[:university])
>>>>
>>>>     respond_to do |format|
>>>>       if @university.save
>>>>         format.html { redirect_to(@university, :notice =>  
''University was
>>>> successfully created.'') }
>>>>         format.xml  { render :xml =>   @university, :status
=>   :created,
>>>> :location =>   @university }
>>>>       else
>>>>         format.html { render :action =>   "new" }
>>>>         format.xml  { render :xml =>   @university.errors,
:status =>
>>>> :unprocessable_entity }
>>>>       end
>>>>     end
>>>>   end
>>>>
>>>>   # PUT /universities/1
>>>>   # PUT /universities/1.xml
>>>>   def update
>>>>     @university = University.find(params[:id])
>>>>
>>>>     respond_to do |format|
>>>>       if @university.update_attributes(params[:university])
>>>>         format.html { redirect_to(@university, :notice =>  
''University was
>>>> successfully updated.'') }
>>>>         format.xml  { head :ok }
>>>>       else
>>>>         format.html { render :action =>   "edit" }
>>>>         format.xml  { render :xml =>   @university.errors,
:status =>
>>>> :unprocessable_entity }
>>>>       end
>>>>     end
>>>>   end
>>>>
>>>>   # DELETE /universities/1
>>>>   # DELETE /universities/1.xml
>>>>   def destroy
>>>>     @university = University.find(params[:id])
>>>>     @university.destroy
>>>>
>>>>     respond_to do |format|
>>>>       format.html { redirect_to(universities_url) }
>>>>       format.xml  { head :ok }
>>>>     end
>>>>   end
>>>> end
>>>>
>>>> Thanks,
>>>> Jen.
>>>>
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