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#3148 ✓stale

Polymorphic belongs_to association isn't fully populated during build

Reported by laserlemon | September 4th, 2009 @ 04:33 PM

With a one-to-many polymorphic association, the build method doesn't work as expected. Given the following models:

class User < ActiveRecord::Base
  has_many :addresses, :as => :addressable

class Address < ActiveRecord::Base
  belongs_to :addressable, :polymorphic => true

building a new address through the user's has_many association properly populates the addressable_id and addressable_type columns, but returns nil for addressable. Using "new" rather than "build" returns the user as expected.

>> user = User.create(:name => "Steve")
=> #<User id: 1, name: "Steve">
>> new_address =
=> #<Address id: nil, addressable_id: 1, addressable_type: "User">
>> new_address.addressable
=> #<User id: 1, name: "Steve">
>> built_address =
=> #<Address id: nil, addressable_id: 1, addressable_type: "User">
>> built_address.addressable
=> nil

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