method

define_attribute_accessor_method

Ruby on Rails latest stable (v7.1.3.2) - 0 notes - Class: AttrNames

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define_attribute_accessor_method(owner, attr_name, writer: false) public

We want to generate the methods via module_eval rather than define_method, because define_method is slower on dispatch.

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.

We are also defining a constant to hold the frozen string of the attribute name. Using a constant means that we do not have to allocate an object on each call to the attribute method. Making it frozen means that it doesn’t get duped when used to key the @attributes in read_attribute.

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# File activemodel/lib/active_model/attribute_methods.rb, line 556
        def self.define_attribute_accessor_method(owner, attr_name, writer: false)
          method_name = "#{attr_name}#{'=' if writer}"
          if attr_name.ascii_only? && DEF_SAFE_NAME.match?(attr_name)
            yield method_name, "'#{attr_name}'"
          else
            safe_name = attr_name.unpack1("h*")
            const_name = "ATTR_#{safe_name}"
            const_set(const_name, attr_name) unless const_defined?(const_name)
            temp_method_name = "__temp__#{safe_name}#{'=' if writer}"
            attr_name_expr = "::ActiveModel::AttributeMethods::AttrNames::#{const_name}"
            yield temp_method_name, attr_name_expr
          end
        end

define_attribute_accessor_method

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