Factories with `#initialize_with`

factory.rb

# spec/factories/factory.rb

  factory :factory_name, class: Klass do
    skip_create
    
    ignore do
      variable "Hello"
    end

    initialize_with do
      object = FactoryGirl.create(:object)
      FactoryGirl.create(:through_object, object: object)
      Klass.new(object)
    end

    after(:create)    { FactoryGirl.create(:callback_or_dependency) }
  end