Re: [Rails] accepts_nested_attributes_for doesn't show output

[Jen]

    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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