Association problem in Rails

Question

I'm new to ruby on rails. So i think i have association problems.

Given the three model classes with their associations:

# user.rb class User < ActiveRecord::Base has_many :product_groups has_many :products, :through=>:product_groups end # product_group.rb class ProductGroup < ActiveRecord::Base has_many :products belongs_to :user end # product.rb class Product < ActiveRecord::Base belongs_to :product_group has_one :user end

So when i trying add new product. I get errors.

# products_controller.rb def new @product = current_user.product_groups.products.build end

The errors I'm receiving is:

 NoMethodError (undefined method `products' for #<Class:0x2ca50b0>): app/controllers/products_controller.rb:27:in `new' -e:2:in `load' -e:2

I'm confused, can anybody help me? Or any different idea ?

Jakub Arnold · Accepted Answer · 2009-09-15 11:57:11Z

Given you have the

has_many :products, :through=>:product_groups

you can do just

def new @product = current_user.products.build end

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