Dependency Injection in Ruby

user_controller.rb

# not di
class UserController
  def create(data)
    User.new(data).save!
  end
end

# usage
controller = UserController.new
controller.create :name => 'Bulat', :username => 'avalanche123'

# di
class UserController
  def initialize(factory)
    @factory = factory
  end

  def create(data)
    @factory.new(data).save!
  end
end

# usage
controller = UserController.new(User)
controller.create :name => 'Bulat', :username => 'avalanche123'

this is what I mean by saying that active record in Ruby is dependency injectable, while static methods/new operators in PHP are not