method

define_attribute_methods

v3.0.0 - Show latest stable - 0 notes - Class: ActiveModel::AttributeMethods::ClassMethods

define_attribute_methods(attr_names) public

Declares a the attributes that should be prefixed and suffixed by ActiveModel::AttributeMethods.

To use, pass in an array of attribute names (as strings or symbols), be sure to declare define_attribute_methods after you define any prefix, suffix or affix methods, or they will not hook in.

  class Person

    include ActiveModel::AttributeMethods
    attr_accessor :name, :age, :address
    attribute_method_prefix 'clear_'

    # Call to define_attribute_methods must appear after the
    # attribute_method_prefix, attribute_method_suffix or
    # attribute_method_affix declares.
    define_attribute_methods [:name, :age, :address]

    private

    def clear_attribute(attr)
      ...
    end
  end

Show source

# File activemodel/lib/active_model/attribute_methods.rb, line 262
      def define_attribute_methods(attr_names)
        return if attribute_methods_generated?
        attr_names.each do |attr_name|
          attribute_method_matchers.each do |matcher|
            unless instance_method_already_implemented?(matcher.method_name(attr_name))
              generate_method = "define_method_#{matcher.prefix}attribute#{matcher.suffix}"

              if respond_to?(generate_method)
                send(generate_method, attr_name)
              else
                method_name = matcher.method_name(attr_name)

                generated_attribute_methods.module_eval "if method_defined?(:\#{method_name})\nundef :\#{method_name}\nend\ndef \#{method_name}(*args)\nsend(:\#{matcher.method_missing_target}, '\#{attr_name}', *args)\nend\n", __FILE__, __LINE__ + 1
              end
            end
          end
        end
        @attribute_methods_generated = true
      end

define_attribute_methods

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