AR inverse_of doesn't work after creation of associated things.

ar_inverse_of_test.rb

require 'active_record'
require 'sqlite3'
require 'minitest/autorun'

puts "ActiveRecord: #{ActiveRecord::VERSION::STRING}"

ActiveRecord::Base.establish_connection(
  :adapter => "sqlite3",
  :database  => ":memory:"
)

ActiveRecord::Schema.define do
  create_table :users, force: true do |t|
  end

  create_table :preferences, force: true do |t|
    t.integer :user_id
  end
end

class User < ActiveRecord::Base
  has_one :preferences, :inverse_of => :user
end

class Preferences < ActiveRecord::Base
  belongs_to :user, :inverse_of => :preferences
end

describe "User/Preferences relationship" do
  before do
    @user = User.create
    @user.create_preferences
  end

  it "is the same object after creation" do
    assert_equal @user.object_id, @user.preferences.user.object_id
  end

  it "is the same object after reloading" do
    @user.reload

    assert_equal @user.object_id, @user.preferences.user.object_id
  end
end

output_3.2.13

ActiveRecord: 3.2.13
-- create_table(:users, {:force=>true})
   -> 0.0096s
-- create_table(:preferences, {:force=>true})
   -> 0.0004s
Run options: --seed 27668

# Running tests:

F.

Finished tests in 0.040778s, 49.0461 tests/s, 49.0461 assertions/s.

  1) Failure:
test_0001_is_the_same_object_after_creation(User/Preferences relationship) [ar_inverse_of_test.rb:36]:
Expected: 19526680
  Actual: 18232740

2 tests, 2 assertions, 1 failures, 0 errors, 0 skips