hooks.rb

##
# Hooks:
# extended (Class that called with extend)
# included (Class that called with include)
# prepended (Class that called with prepend)
# inherited (Class that was inherited with <)
# method_added (Method symbol of new method created)
# method_removed (Method symbol when method removed)
# method_undefined (Method symbol of undefined method)
# singleton_method_added (Method symbol of new method created)
# singleton_method_removed (Method symbol when method removed)
# singleton_method_undefined (Method symbol of undefined method)
#
module Example
  def self.included(base)
    # do something on include
  end
end