1. Allan Davis
  2. RubyLearning

Source

RubyLearning / ProjectTrak / vendor / rails / activesupport / lib / active_support / core_ext / class.rb

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require 'active_support/core_ext/class/attribute_accessors'
require 'active_support/core_ext/class/inheritable_attributes'
require 'active_support/core_ext/class/removal'
require 'active_support/core_ext/class/delegating_attributes'