DCI Example

gistfile1.rb

#model / Data object
class User
  attr_reader :name, :approved

  def initialize name
    @name = name
    @approved = false
  end

  def approved?
    @approved
  end

  def save!
  end
end

#context
class UserApprover
  attr_reader :member

  def initialize user
    @member = user.extend Member
  end

  def approve_user
    member.approve
    save_changes
  end

  private

  def save_changes
    member.save!
  end

  #roles
  module Member
    def approve
      @approved = true
    end

    def block
      @approved = false
    end
  end
end

user = User.new("Rinaldi")
UserApprover.new(user).approve_user
p user.approved?