define_attribute_methods

# File activerecord/lib/active_record/attribute_methods.rb, line 104
      def define_attribute_methods # :nodoc:
        return false if @attribute_methods_generated
        # Use a mutex; we don't want two threads simultaneously trying to define
        # attribute methods.
        GeneratedAttributeMethods::LOCK.synchronize do
          return false if @attribute_methods_generated

          superclass.define_attribute_methods unless base_class?

          unless abstract_class?
            load_schema
            super(attribute_names)
            alias_attribute :id_value, :id if _has_attribute?("id")
          end

          @attribute_methods_generated = true

          generate_alias_attributes
        end
        true
      end