Ruby Fleebie » Need support for has_many through with has

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Need support for has_many through with has_one in the “bridge table”

Sep 13, 2008 @ 02:02 pm

3 Comments

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Let me expose the problem with an example :

Cart model (as in : shopping cart)

class Cart < ActiveRecord::Base
  has_one :bill
  belongs_to :user
end

Bill model

class Bill < ActiveRecord::Base
  belongs_to :cart  
end

User

class User < ActiveRecord::Base
  has_many :carts
  has_many :bills, :through => :carts #<== Doesn’t work… no user.bills for you!
end

Basically, because the “through” table links the destination table with a has_one relationship, ActiveRecord complains with : Invalid source reflection macro :has_one for has_many :bills, :through => :carts. Use :source to specify the source reflection.

Someone on Rails Trac already created a ticket about this issue 2 years ago. Can we expect this feature to be officially supported in the future? Let’s hope so.

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