On Miércoles, 7 de Abril de 2010 16:59:26 anton escribió:
> Hi,
>
> Hoping someone can help me with this. I have a :has_many :through self
> referential association. Creating/Adding/Removing Products and nested
> associated products in working fine apart from when you try to remove
> the last existing Product of the association. The update isn't
> triggered on the association table (I'm presuming because there is no
> collection in the updated model to trigger the associated update/
> delete).
>
> See example below, where a Product can have many AssociatedProducts:
>
> Tables:
> create_table :products do |t|
> t.string :title, :null => false
> end
>
> create_table :associated_products do |t|
> t.references :product, :null => false
> t.integer :associated_id, :null => false
> end
>
> Models:
> class Product < ActiveRecord::Base
> has_many :associated_products, :dependent => :destroy
> has_many :associates, :through => :associated_products
> end
>
> class AssociatedProduct < ActiveRecord::Base
> belongs_to :product
> belongs_to :associate, :class_name => "Product", :foreign_key
> => :associated_id
> end
It's a bug in has_many through support. Really you don't need has_many through
in this case, you can do the same with habtm (which is working):
class Product < ActiveRecord::Base
has_and_belongs_to_many :associates, :class_name => 'Product', :join_table
=> :associated_products, :association_foreign_key => :associate_id
end
Anyway, I have fixed removing last associated record from has_many through
>
> Controllers:
> class ProductsController < ApplicationController
> active_scaffold :product do |config|
> config.columns = [ :title, :associates ]
> config.columns[:associates].form_ui = :select
> # Same behaviour whether draggable_lists or standard checkboxes
> are used
> #config.columns[:associates].options = {:draggable_lists => true}
> config.columns[:associates].label = "Associated Products"
> end
> end
>
>
> Any help on this greatly appreciated.
>
> Cheers,
>
> Anton
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