Rails - Jan 2010 - problem using build with has_many :through relationship

Hello all,
I''m having problems creating a new record with has_many :through
My application is quite complicated so I''ll try to explain it as easy
as
I can.

I have a many to many relationship with Projects, IRBs and Reviews.
Where reviews is the joined model.

In the new project view, I have a link (add IRB). This will add an a
list of IRBs to the new project form.
I have visited a Railscast(#73-75) similar to this.
The difference is I need to search for an IRB# first.
Therefore when use the link it will open a jQuery UI dialog box.  Within
the dialog, I have a search bar for ''irbs''.
When a search is implemented, the results appear in the dialog box. Each
result has a ''irb#, title and a link "add IRB"
This link will add/create the association in the Reviews model.

I have setup everything up similar to a Railscast (163. Self-Referential
Association) but when I click the ''Add IRB'', I get a
"undefined method
`reviews'' for #<Array:0x10322cbb8>" error.

My project, irb and review models.

- project model -
class Project < ActiveRecord::Base
  has_many :reviews
  has_many :irbs, :through => :reviews
end

-irb model -
class Irb < ActiveRecord::Base
  # Relationships
  has_many :reviews
  has_many :projects, :through => :reviews
end

- review model -
class Review < ActiveRecord::Base
  belongs_to :irb         # foreign key - irb_id
  belongs_to :project   # foreign key - project_id
end

- reviews_controller -
class ReviewsController < ApplicationController
  def create
    @review = Project.reviews.build( :irb_id => params[:id] )
    if @review.save
      flash[:notice] = "IRB added."
      redirect_to new_project_path
    else
      flash[:error] = "Unable to add IRB."
      redirect_to new_project_path
    end
  end

  def destroy
    @review = Project.reviews.find(params[:id])
    @review.destroy
    flash[:notice] = "IRB Removed."
    redirect_to new_project_path
  end

end

Here''s the partial to which the "Add IRB" link is.
- _searchresults.html.erb -
<% content_for :head do %>
  <%= stylesheet_link_tag ''dialog'' %>
<% end %>

<table class="searchResults">
      <tr><th colspan="7">IRB Search
Results</th></tr>
      <tr>
        <th>IRB ID</th>
        <th>Title</th>
        <th>PI Full Name</th>
        <th>Actions</th>
      </tr>
      <% @irbs.each do |irb| %>
      <tr id=''<%= irb.id %>''>
          <td><%=h irb.IRB %></td>
          <td><%=h truncate(irb.Title, :length => 30)
%></td>
          <td><%=h irb.PI_Full_Name %></td>
          <td><%= link_to ''Add IRB'', reviews_path,
:id => irb.id,
:method => :post %></td>
      </tr>
      <% end %>
</table>
<%= will_paginate @irbs %>

Thank you for any advice or help with this.

John
-- 
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-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en.

On Jan 8, 3:48 pm, John Mcleod
<li...-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org>
wrote:
>   def create
>     @review = Project.reviews.build( :irb_id => params[:id] )
this and
>   def destroy
>     @review = Project.reviews.find(params[:id])
this look weird - Project does not have a reviews method - instances
of it do. Especially in the first case you want to be getting an
appropriate instance of project first and then do reviews.build on it

Fred


-- 
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
To unsubscribe from this group, send email to
rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en.