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Frank

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

Sep 13, 2008 @ 02:02 pm

4 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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Posted under : short & sweet

4 Comments

I think the rails core crew would welcome a patch for this.

Comment by : Tim Haines

— September 14, 2008 @ 10:28 pm

What Time said Please submit the patch with tests on LightHouse.

Comment by : Pratik

— September 15, 2008 @ 1:47 pm

Hey guys,

You’re right, I’ll do that

Comment by : Frank

— September 15, 2008 @ 7:10 pm

Hey, Frank. Any updates on this?

I was searching through Lighthouse for a ticket/patch but didn’t have any success. I’m looking for a patch re: this, too, I just don’t want to duplicate any effort… Thanks much !

Comment by : Andrew Stott

— February 19, 2009 @ 6:42 pm

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