alias_method_chain (ActiveSupport::CoreExtensions::Module)

    # File lib/active_support/core_ext/module/aliasing.rb, line 25
          def alias_method_chain(target, feature)
            # Strip out punctuation on predicates or bang methods since
            # e.g. target?_without_feature is not a valid method name.
            aliased_target, punctuation = target.to_s.sub(/([?!=])$/, ''), $1
            yield(aliased_target, punctuation) if block_given?

            with_method, without_method = "#{aliased_target}_with_#{feature}#{punctuation}", "#{aliased_target}_without_#{feature}#{punctuation}"

            alias_method without_method, target
            alias_method target, with_method

            case
              when public_method_defined?(without_method)
                public target
              when protected_method_defined?(without_method)
                protected target
              when private_method_defined?(without_method)
                private target
            end
          end