method

define_method_attribute

v3.2.13 - Show latest stable - 0 notes - Class: ActiveRecord::AttributeMethods::Read::ClassMethods

define_method_attribute(attr_name) protected

We want to generate the methods via module_eval rather than define_method, because define_method is slower on dispatch and uses more memory (because it creates a closure).

But sometimes the database might return columns with characters that are not allowed in normal method names (like ‘my_column(omg)’. So to work around this we first define with the __temp__ identifier, and then use alias method to rename it to what we want.

Show source

# File activerecord/lib/active_record/attribute_methods/read.rb, line 69
          def define_method_attribute(attr_name)
            generated_attribute_methods.module_eval               def __temp__                #{internal_attribute_access_code(attr_name, attribute_cast_code(attr_name))}              end              alias_method '#{attr_name}', :__temp__              undef_method :__temp__, __FILE__, __LINE__ + 1
          end

define_method_attribute

Related methods