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akkdio

2012-Jun-12 12:09 UTC

render => partial not recognizing method in call

Perhaps it is something basic as a beginner I am.  I have the following:

controllers:
main
editions
works
composers

main: 
class MainController < ApplicationController
  def welcome
    @composers = Composer.find(:all).sort_by {|c| [c.last_name, 
c.first_name]}
  end 
end

works - editions - composers all have normal scaffold generated 
methods(CRUD)

Models: - relavent info (hopefully) provided:

class Composer < ActiveRecord::Base
  attr_accessible :first_name, :last_name
  has_many :works, dependent: :destroy
  before_destroy :ensure_not_referenced_by_any_work

....
 def editions
    works.map {|work| work.editions}.flatten.uniq
    
  end
....
end

class Edition < ActiveRecord::Base
  
  validates :publisher_id, :description, :price, :year, presence: true
  has_many :environments
  has_many :works, through: :environments
  belongs_to :publisher
  has_many :orders
  
  attr_accessible :descripition, :price, :work_id, :year, :title, 
:publisher_id

....
end

class Work < ActiveRecord::Base
  attr_accessible :composer_id, :title

  belongs_to :composer
  has_many :environments
  has_many :editions, :through => :environments
  
  has_many :instruments, :through => :environments
...
end

class Environment < ActiveRecord::Base
    attr_accessible :instrument_id, :name, :work_id, :edition_id
    belongs_to :work
    belongs_to :instrument
    belongs_to :edition

end


I want the following partial to be shown in the Main#Welcome view:

partial is located in the composer view folder:

<h3>Editions List</h3>
<ul>
<% @composer.editions.map do |edition| %> #line 3 in error below
<li><%= link_to_edition_title(edition)%></li>
<% end %>
</ul> 
 
The link_to_edition_title(edition)... may not be relavent but here it is in 
the edition helper module:

def link_to_edition_title(edition)
    link_to(edition.nice_title, edition_path(edition))
  end


My limited knowledge believes the call to the partial should work and 
indeed it does if done like this within the Composer#Show view:

<%= render "edition" %>

However, when I make the partial call from the Main#Welcome view like this:
The Main#Welcome view:
 <%= render :partial => "composers/edition" %>

It results in this error:

*NoMethodError in Main#welcome*

Showing *
/Users/akkdio/railsapps/rails_3/ruby_for_rails/r4r_music/r4r_music1/app/views/composers/_edition.html.erb
* where line *#3* raised:

undefined method `editions'' for nil:NilClass

This is the first linke of the trace:

app/views/composers/_edition.html.erb:3:in 
`_app_views_composers__edition_html_erb__1574837102347920251_2165688820''

If more is needed please let me know.  Appreciate any nudge as to how I 
would change the partial or somehow get the editions method to be 
recognized in this call - the idea is to be able to share the partial 
across the application.  

Thanks for your help,

Andrew



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Colin Law

2012-Jun-12 12:25 UTC

head link

Re: render => partial not recognizing method in call

On 12 June 2012 13:09, akkdio
<akkdio-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:> Perhaps it is something basic as a beginner I am.  I have the following:
There was no need to show all this code, it is easier for us to see
what is going on if you just show the relevant bits
> [snip]
>
> I want the following partial to be shown in the Main#Welcome view:
>
> partial is located in the composer view folder:
>
> <h3>Editions List</h3>
> <ul>
> <% @composer.editions.map do |edition| %> #line 3 in error below
> [snip]
>
> My limited knowledge believes the call to the partial should work and
indeed
> it does if done like this within the Composer#Show view:
>
> <%= render "edition" %>
>
> However, when I make the partial call from the Main#Welcome view like this:
> The Main#Welcome view:
> <%= render :partial => "composers/edition" %>
>
> It results in this error:
>
> NoMethodError in Main#welcome
>
> Showing
>
/Users/akkdio/railsapps/rails_3/ruby_for_rails/r4r_music/r4r_music1/app/views/composers/_edition.html.erb
> where line #3 raised:
>
> undefined method `editions'' for nil:NilClass
That means that @composer is nil, since that is the object on which
''editions'' is being called.

Have a look at the Rails Guide on Layouts and Rendering, particularly
the section Using Partials to see how to pass local variables to the
partial.

Also have a look at the guide on debugging to get ideas on how to
debug your code so that you can work out what is going on.

I notice that you have asked for help twice before on this list and
neither time did you reply to the suggestions offered or report
whether you had found a solution. :(

Colin

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Max Reznichenko

2012-Jun-12 12:34 UTC

head link

Re: render => partial not recognizing method in call

Hi, Andrew

The error says the @composer variable is not set. 
By the code I see, that you are setting @composer*s* variable.

Take a look at the starting guide on rendering in Ruby on Rails as an 
approach itself is wrong.

Max

вторник, 12 июня 2012 г., 15:09:30 UTC+3 пользователь akkdio
написал:>
> Perhaps it is something basic as a beginner I am.  I have the following:
>
> controllers:
> main
> editions
> works
> composers
>
> main: 
> class MainController < ApplicationController
>   def welcome
>     @composers = Composer.find(:all).sort_by {|c| [c.last_name, 
> c.first_name]}
>   end 
> end
>
> works - editions - composers all have normal scaffold generated 
> methods(CRUD)
>
> Models: - relavent info (hopefully) provided:
>
> class Composer < ActiveRecord::Base
>   attr_accessible :first_name, :last_name
>   has_many :works, dependent: :destroy
>   before_destroy :ensure_not_referenced_by_any_work
>
> ....
>  def editions
>     works.map {|work| work.editions}.flatten.uniq
>     
>   end
> ....
> end
>
> class Edition < ActiveRecord::Base
>   
>   validates :publisher_id, :description, :price, :year, presence: true
>   has_many :environments
>   has_many :works, through: :environments
>   belongs_to :publisher
>   has_many :orders
>   
>   attr_accessible :descripition, :price, :work_id, :year, :title, 
> :publisher_id
>
> ....
> end
>
> class Work < ActiveRecord::Base
>   attr_accessible :composer_id, :title
>
>   belongs_to :composer
>   has_many :environments
>   has_many :editions, :through => :environments
>   
>   has_many :instruments, :through => :environments
> ...
> end
>
> class Environment < ActiveRecord::Base
>     attr_accessible :instrument_id, :name, :work_id, :edition_id
>     belongs_to :work
>     belongs_to :instrument
>     belongs_to :edition
>
> end
>
>
> I want the following partial to be shown in the Main#Welcome view:
>
> partial is located in the composer view folder:
>
> <h3>Editions List</h3>
> <ul>
> <% @composer.editions.map do |edition| %> #line 3 in error below
> <li><%= link_to_edition_title(edition)%></li>
> <% end %>
> </ul> 
>  
> The link_to_edition_title(edition)... may not be relavent but here it is 
> in the edition helper module:
>
> def link_to_edition_title(edition)
>     link_to(edition.nice_title, edition_path(edition))
>   end
>
>
> My limited knowledge believes the call to the partial should work and 
> indeed it does if done like this within the Composer#Show view:
>
> <%= render "edition" %>
>
> However, when I make the partial call from the Main#Welcome view like this:
> The Main#Welcome view:
>  <%= render :partial => "composers/edition" %>
>
> It results in this error:
>
> *NoMethodError in Main#welcome*
>
> Showing *
>
/Users/akkdio/railsapps/rails_3/ruby_for_rails/r4r_music/r4r_music1/app/views/composers/_edition.html.erb
> * where line *#3* raised:
>
> undefined method `editions'' for nil:NilClass
>
> This is the first linke of the trace:
>
> app/views/composers/_edition.html.erb:3:in 
>
`_app_views_composers__edition_html_erb__1574837102347920251_2165688820''
>
> If more is needed please let me know.  Appreciate any nudge as to how I 
> would change the partial or somehow get the editions method to be 
> recognized in this call - the idea is to be able to share the partial 
> across the application.  
>
> Thanks for your help,
>
> Andrew
>
>
>
>
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akkdio

2012-Jun-12 19:55 UTC

head link

Re: render => partial not recognizing method in call

> > Perhaps it is something basic as a beginner I am.  I have the
following:
>
> There was no need to show all this code, it is easier for us to see 
> what is going on if you just show the relevant bits 
>
> Understand and thanks.  
> > [snip] 
>
> > 
> > I want the following partial to be shown in the Main#Welcome view: 
> > 
> > partial is located in the composer view folder: 
> > 
> > <h3>Editions List</h3> 
> > <ul> 
> > <% @composer.editions.map do |edition| %> #line 3 in error below
> > [snip] 
> > 
> > My limited knowledge believes the call to the partial should work and 
> indeed 
> > it does if done like this within the Composer#Show view: 
> > 
> > <%= render "edition" %> 
> > 
> > However, when I make the partial call from the Main#Welcome view like 
> this: 
> > The Main#Welcome view: 
> > <%= render :partial => "composers/edition" %> 
> > 
> > It results in this error: 
> > 
> > NoMethodError in Main#welcome 
> > 
> > Showing 
> > 
>
/Users/akkdio/railsapps/rails_3/ruby_for_rails/r4r_music/r4r_music1/app/views/composers/_edition.html.erb
>
> > where line #3 raised: 
> > 
> > undefined method `editions'' for nil:NilClass 
>
> That means that @composer is nil, since that is the object on which 
> ''editions'' is being called. 
>
> Have a look at the Rails Guide on Layouts and Rendering, particularly 
> the section Using Partials to see how to pass local variables to the 
> partial. 
>
> Also have a look at the guide on debugging to get ideas on how to 
> debug your code so that you can work out what is going on. 
>
Will check this. thanks.  
>
> I notice that you have asked for help twice before on this list and 
> neither time did you reply to the suggestions offered or report 
> whether you had found a solution. :( 
>
Not an excuse but I was not notified of the someone answering... Sorry.   
This time I checked back and check "email updates to me" Sorry again -
I
appreciate all the guidance i can get.    
>
> Colin 
>
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akkdio

2012-Jun-13 13:31 UTC

head link

Re: render => partial not recognizing method in call

On Tuesday, June 12, 2012 3:55:32 PM UTC-4, akkdio
wrote:>
>
>
>
>> > Perhaps it is something basic as a beginner I am.  I have the 
>> following: 
>>
>> There was no need to show all this code, it is easier for us to see 
>> what is going on if you just show the relevant bits 
>>
>> Understand and thanks.  
>
>> > [snip] 
>>
>> > 
>> > I want the following partial to be shown in the Main#Welcome view:
>> > 
>> > partial is located in the composer view folder: 
>> > 
>> > <h3>Editions List</h3> 
>> > <ul> 
>> > <% @composer.editions.map do |edition| %> #line 3 in error
below
>> > [snip] 
>> > 
>> > My limited knowledge believes the call to the partial should work
and
>> indeed 
>> > it does if done like this within the Composer#Show view: 
>> > 
>> > <%= render "edition" %> 
>> > 
>> > However, when I make the partial call from the Main#Welcome view
like
>> this: 
>> > The Main#Welcome view: 
>> > <%= render :partial => "composers/edition" %> 
>> > 
>> > It results in this error: 
>> > 
>> > NoMethodError in Main#welcome 
>> > 
>> > Showing 
>> > 
>>
/Users/akkdio/railsapps/rails_3/ruby_for_rails/r4r_music/r4r_music1/app/views/composers/_edition.html.erb
>>
>> > where line #3 raised: 
>> > 
>> > undefined method `editions'' for nil:NilClass 
>>
>> That means that @composer is nil, since that is the object on which 
>> ''editions'' is being called. 
>>
>> Have a look at the Rails Guide on Layouts and Rendering, particularly 
>> the section Using Partials to see how to pass local variables to the 
>> partial. 
>>
>> Also have a look at the guide on debugging to get ideas on how to 
>> debug your code so that you can work out what is going on. 
>>
>
> Will check this. thanks.  
>
>>
>> I notice that you have asked for help twice before on this list and 
>> neither time did you reply to the suggestions offered or report 
>> whether you had found a solution. :( 
>>
>
> Not an excuse but I was not notified of the someone answering... Sorry.   
> This time I checked back and check "email updates to me" Sorry
again - I
> appreciate all the guidance i can get.    
>
>>
>> Colin 
>>
>My solution/learning (sort of) I read through the Rails Guide and it was 
somewhat helpful - lots to learn -  

My disconnect however that I was under the impression that the partial 
because it worked when I used in the composer show method it would work in 
the Main#Welcome view.  Well, this is incorrect because in the 
Composer#Index view I click on the Composer ID (set up as a link_to on the 
id:

 <td><%= link_to composer.id, composer_path(composer) %></td>

This is how the partial gets the composer id in order  make the editions 
partial work and why the editions method returned a Nil when called from 
the Main#welcome view.  It was saying " what composer?  I can''t
find no
stinking Composer"   If I do want the editions listed in the Main#Welcome 
view for each composer then I will have to find a way to send the editions 
method the composer id it is looking for.   Time for more reading.

Thanks all for the nudge.

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Rails - Jun 2012 - render => partial not recognizing method in call

render => partial not recognizing method in call

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Re: render => partial not recognizing method in call

Re: render => partial not recognizing method in call