ruby-on-rails-3 - factoryGirl を使用した Has_many

Question

私はこのモデルを持っています:

class Application < ActiveRecord::Base
  has_many :admin_user_applications, dependent: :destroy
  has_many :admin_users, through: :admin_user_applications, :source => :user, validate: :false
end

class User < ActiveRecord::Base
  has_many :admin_user_applications, dependent: :destroy
  has_many :administrable_applications, through: :admin_user_applications, :source => :application
end

class UserApplication < ActiveRecord::Base
  belongs_to :user
  belongs_to :application
end

アプリケーションファクトリーを定義しました：

FactoryGirl.define do
  factory :application, :class => Application do
    sequence(:name) {|n| "application-#{n}" }
    association :owner, :factory => :user
  end
end

しかし、私がこれを行うと:

app_3 = FactoryGirl.create(:application, admin_users: [@user])
puts @user.admin_user_applications.inspect  # =>[] 

それは私を返します[]

私は何を間違っていますか？