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# app/models/address.rb

class Address < ActiveRecord::Base
  belongs_to :addressable, polymorphic: true
end

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module Expirable
  extend ActiveSupport::Concern

  included do
    cattr_accessor :default_lifetime
    self.default_lifetime = 6.hours

    scope :valid, where('expires_at >= ?', Time.now)
    before_validation :set_default_expiration, :on => :create
  end

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module VirtualAttributes
  extend ActiveSupport::Concern

  class VirtualAttribute
    attr_reader :name, :type
  
    def initilaize(name, type = :string)
      @name = name
      @type = type
    end

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module Reportable
  extend ActiveSupport::Concern

  module ClassMethods
    # Chain on a scope and specify the fields to extract.
    # Example:
    #   User.enabled.report %{
    #     :email_opt_in,
    #     'created_at as sign_up_date'
    #   }

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class Ping
  module Blockable

    extend ActiveSupport::Concern

    included do
      belongs_to :blocker, class_name: 'User'
    end

    def blocked?

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# using active_support
require 'active_support/core_ext'

module Mixpanel
  extend ActiveSupport::Concern

  # class methods
  included do
    mixpanel
  end

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require 'iconv'

module ExportableControllerMethods
  BOM = "\377\376" #Byte Order Mark

  extend ActiveSupport::Concern

  protected

  def export_as_csv(collection, column_names, filename)

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module ActsAsHistorical
  extend ActiveSupport::Concern
 
  included do
  end

  module ClassMethods
    def acts_as_historical(options = {})
      has_many :histories, :as => :historical, :dependent => :destroy
      include MyInstanceMethods

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module SidekiqIndexing
  module SearchableOverride
    extend ActiveSupport::Concern

    module InstanceOverrides
      def solr_index
        SunspotIndexer.perform_async(self.class.to_s, self.id)
      end
    end

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module Eventable
  module Emitter
    extend ActiveSupport::Concern

    included do
      def emit(event_name, payload = {})
        full_event = "#{self.class.to_s.underscore}:#{event_name}"
        Eventable.emit full_event, self, payload
      end
    end