Rails - Oct 2007 - Complex Forms (From Railscasts.com)

Hi,

I have been watching the last three episodes on railscasts.com in
which he goes through dealing with multiple models in one for using
fields_for, and virtual attributes. (http://railscasts.com/episodes/
73). Here is an example of the way they suggest to go about it:


# projects_controller.rb
def new
  @project = Project.new
  3.times { @project.tasks.build }
end

def create
  @project = Project.new(params[:project])
  if @project.save
    flash[:notice] = "Successfully created project."
    redirect_to projects_path
  else
    render :action => ''new''
  end
end

# models/project.rb
def task_attributes=(task_attributes)
  task_attributes.each do |attributes|
    tasks.build(attributes)
  end
end

VIEW
<!-- new.rhtml -->
<% form_for :project, :url => projects_path do |f| %>
  <p>
    Name: <%= f.text_field :name %>
  </p>
  <% for task in @project.tasks %>
    <% fields_for "project[task_attributes][]", task do |task_form|
%>
      <p>
        Task: <%= task_form.text_field :name %>
      </p>
    <% end %>
  <% end %>
  <p><%= submit_tag "Create Project" %></p>
<% end %>

This example uses a one to many relationship. (they go further in
future episodes, but for now this will be fine).  My issue is that I
would like to do this over multiple relationships. For example: what
if a task had multiple requirements? How can I do this with still only
calling Project.new(params[:project]) and having everything still set
automatically?

Thanks for you help!


--~--~---------~--~----~------------~-------~--~----~
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-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en
-~----------~----~----~----~------~----~------~--~---

> My issue is that I
> would like to do this over multiple relationships. For example: what
> if a task had multiple requirements? How can I do this with still only
> calling Project.new(params[:project]) and having everything still set
> automatically?
> 
I''m having a similar issue... I''m trying to use one form_for,
and
MULTIPLE fields_for to set up nested models.

###
my models are like this (i''m omitting a bunch of stuff):

Post
:has_many :groups

Group
:has_many :post_items

###

I''ve got the second fields for looking something like this:

<% fields_for "post[group_attributes][][post_item_attributes][]", 
post_item do |post_item_form|%>

<td>
  Link Text: <%= post_item_form.text_field :display_text %>
</td>

<td>
  URL: <%= post_item_form.text_field :url %>
</td>

<% end %>
-- 
Posted via http://www.ruby-forum.com/.

--~--~---------~--~----~------------~-------~--~----~
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-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en
-~----------~----~----~----~------~----~------~--~---

Alright, I think I have the issue figured out. In your example, i
think you have 1 too many sets of braces.

For the example above, if a task had multiple requirements, your view
would look something like the following for the requirements:

<% for requirement in @project.task.requirements %>
<% fields_for "project[task_attributes][requirement_attributes][]",
requirement do |requirement_form| %>
<p>
Requirement: <%= requirement_form.text_field :name %>
</p>
<% end %>
<% end %>

Then in the task model:

def requirement_attributes=(requirement_attributes)
   requirement_attributes.each do |attributes|
      self.requirements.build(attributes)
   end
end

This seems to work.


--~--~---------~--~----~------------~-------~--~----~
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-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en
-~----------~----~----~----~------~----~------~--~---