Question

I have these two tables:

colors
- id
- name
- name_code

cars
- id
- manufacturer
- color_code_name

(in the columns colors.name_code and cars.color_code_name are the same values)

I would like to get all cars with the respective color. I tried to set up these associations:

class Color < ActiveRecord::Base
  has_many :cars, :primary_key => "name_code"
end
class Car < ActiveRecord::Base
  belongs_to :color, :primary_key => "color_code_name"
end

But this is unfortunately doesn’t working… I didn’t specify yet this kind of association, so I am not really sure, if it’s possible to do it…

I am gonna be grateful for every advise

Answer 1

Try this:

class Color < ActiveRecord::Base
  self.primary_key :name_code
  has_many :cars, :foreign_key => :color_code_name
end

class Car < ActiveRecord::Base
  self.primary_key :color_code_name
  belongs_to :color, :foreign_key => :color_code_name
end