Rails - Feb 2006 - Problem having two belongs_to of the same class type

I have a Shipment class that is used to ship packages between Branches. 
However, when I try to have two belongs_to in Shipment called shipped_to 
and shipped_from I can''t seem to make it work. I can get it to display 
the form properly but when I select the branches and click save I get 
the following error...

"Branch expected, got String"

Any ideas? I have added some code snipplets below for reference.

Thanks!

shipment.rb:
------------------------------------------------

class Shipment < ActiveRecord::Base
  belongs_to :shipped_to,
             :class_name => ''Branch'',
             :foreign_key => ''shipped_to_id''
  belongs_to :shipped_from,
             :class_name => ''Branch'',
             :foreign_key => ''shipped_from_id''
end

branch.rb
------------------------------------------------

class Branch < Entity
  has_many :shipped_to,
           :class_name => ''Shipment'',
           :order => ''updated_on DESC'',
           :foreign_key => ''shipped_to_id'',
           :dependent => true
  has_many :shipped_from,
           :class_name => ''Shipment'',
           :order => ''updated_on DESC'',
           :foreign_key => ''shipped_from_id'',
           :dependent => true
end

entity.rb
------------------------------------------------

class Entity < ActiveRecord::Base
end

_form.rhtml:
------------------------------------------------

<%= error_messages_for ''shipment'' %>

<table>
  <tr>
    <th>Shipped to</th>
    <td><%= collection_select ''shipment'',
''shipped_to'', @branches, ''id'',
''name'' %></td>
  </tr>
  <tr>
    <th>Shipped from</th>
    <td><%= collection_select ''shipment'',
''shipped_from'', @branches,
''id'', ''name'' %></td>
  </tr>
  <tr>
</table>

shipments_controller.rb:
------------------------------------------------

class ShipmentsController < ApplicationController
 def new
    @branches = Branch.find(:all, :order => ''name'')
    case request.method
      when :get
        @shipment = Shipment.new
      when :post
        @shipment = Shipment.new(params[:shipment])
        if @shipment.save
          flash[:notice] = ''Shipment was successfully created''
          redirect_to :action => ''list''
        else
          render :action => ''new''
        end
    end
  end
end

-- 
Posted via http://www.ruby-forum.com/.

Arnold Cano wrote:
> "Branch expected, got String"
> ...
>     <td><%= collection_select ''shipment'',
''shipped_to'', @branches, ''id'',
''name'' %></td>
>   </tr>
>   <tr>
>     <th>Shipped from</th>
>     <td><%= collection_select ''shipment'',
''shipped_from'', @branches, ''id'',
''name'' %></td>
Use shipped_to_id and shipped_from_id in your collection_selects.

-- 
We develop, watch us RoR, in numbers too big to ignore.

I updated my form with your suggestion as follows:

<table>
  <tr>
    <th>Shipped to</th>
    <td><%= collection_select ''shipment'',
''shipped_to_id'', @branches,
''id'', ''name'' %></td>
  </tr>
  <tr>
    <th>Shipped from</th>
    <td><%= collection_select ''shipment'',
''shipped_from_id'', @branches,
''id'', ''name'' %></td>
  </tr>
</table>

But now when I click save I get the following error...

"interning empty string"

Any other ideas? I''m stumped!


Mark Reginald James wrote:
> Arnold Cano wrote:
> 
>> "Branch expected, got String"
>> ...
>>     <td><%= collection_select ''shipment'',
''shipped_to'', @branches, ''id'',
''name'' %></td>
>>   </tr>
>>   <tr>
>>     <th>Shipped from</th>
>>     <td><%= collection_select ''shipment'',
''shipped_from'', @branches, ''id'',
''name'' %></td>
> 
> Use shipped_to_id and shipped_from_id in your collection_selects.
> 
> --
> We develop, watch us RoR, in numbers too big to ignore.

-- 
Posted via http://www.ruby-forum.com/.

Arnold Cano wrote:
> But now when I click save I get the following error...
> 
> "interning empty string"
> 
> Any other ideas? I''m stumped!
That''s some other problem.  Have a look at the full stack trace
of the error to work out where it is occuring.

-- 
We develop, watch us RoR, in numbers too big to ignore.

You were absolutely right I had a bug in my validation code that was
causing this error. I just thought it had something to do with the
belongs_to because it kept pointing me to the line number where the
actual save was taking place.

Thanks for your help!

Arnold

Mark Reginald James wrote:
> Arnold Cano wrote:
> 
>> But now when I click save I get the following error...
>> 
>> "interning empty string"
>> 
>> Any other ideas? I''m stumped!
> 
> That''s some other problem.  Have a look at the full stack trace
> of the error to work out where it is occuring.
> 
> --
> We develop, watch us RoR, in numbers too big to ignore.
-- 
Posted via http://www.ruby-forum.com/.