Has_many :through habtm

Rails
1

Here is my setup:

class Product < ActiveRecord::Base
belongs_to :catalog
has_and_belongs_to_many :product_groups
end

class ProductGroup < ActiveRecord::Base
belongs_to :catalog
has_and_belongs_to_many :products
end

class Catalog < ActiveRecord::Base
has_many :product_groups
has_many :products, :through => :product_groups
end

I get:
Invalid source reflection macro :has_and_belongs_to_many for
has_many :products, :through => :product_groups. Use :source to
specify the source reflection.

I have seen a few threads with posts asking this question, but found
no suitable solution or workaround…
any ideas please.

2

As written, there’s no direct way to do this association in Rails. But
wouldn’t it be sufficient to use a plain has_many :products in
Catalog? You’ve got a corresponding belongs_to in Product…

–Matt J.

3

yeah, I think it is sufficient. thanks.