[Rails] Rails 4 "belongs_to: record" association doesn't work

Ruby on Rails Friday, July 19, 2013

Hi,

I discovered a weird behavior when using a "belongs_to: record" association in Rails 4.

Given two models A and B:

class A < ActiveRecord::Base

belongs_to :record, class_name: 'B', foreign_key: 'b_id'

end

class B < ActiveRecord::Base

end

When creating A, it inserts a record in B and returns A with id of nil:

irb(main):001:0> A.create!

(0.1ms) begin transaction

SQL (0.4ms) INSERT INTO "bs" DEFAULT VALUES

(2.4ms) commit transaction

=> #<A id: nil, b_id: 1>

A.count # => 0

B.count # => 1

It used to work in Rails 3.

I've created a test repo for this: https://github.com/davidpiegza/rails4-belongs-to-test.

Any ideas why it doesn't work in Rails 4?

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