Unpack Content Package

Serialize with Validations.rb

class Content_Package::Unpack
  include ActiveModel::Serializers::JSON
  include ActiveModel::Validations
  
  ATTRIBUTES = [:test_id, :question_id, :answer]
  attr_accessor *ATTRIBUTES
  
  validates_presence_of :test_id, :question_id
  validates_inclusion_of :answer, :in => %w[A B C D]
  
  def initialize(attributes = {})
    self.attributes = attribute
  end
  
  def attributes
    ATTRIBUTES.inject(
      ActiveSupport::HashWithIndifferentAccess.new
    ) do |result, key|
      result[key] = read_attribute_for_validation(key)
      result
    end
  end
  
  def attributes=(attrs)
    attrs.each_pair {|k, v| send("#{k}=", v)}
  end
  
  def read_attribute_for_validation(key)
    send(key)
  end
end