define_attribute_methods (ActiveRecord::AttributeMethods::ClassMethods)

    # File lib/active_record/attribute_methods.rb, line 61
          def define_attribute_methods
            return if generated_methods?
            columns_hash.each do |name, column|
              unless instance_method_already_implemented?(name)
                if self.serialized_attributes[name]
                  define_read_method_for_serialized_attribute(name)
                else
                  define_read_method(name.to_sym, name, column)
                end
              end

              unless instance_method_already_implemented?("#{name}=")
                define_write_method(name.to_sym)
              end

              unless instance_method_already_implemented?("#{name}?")
                define_question_method(name)
              end
            end
          end