instance method `define_attribute_method`

Ruby on Rails 4.1.16

Since v3.1.12

Available in: v3.1.12 v3.2.22.5 v4.0.13 v4.1.16 v4.2.9 v5.2.8.1 v6.0.6 v6.1.7.10 v7.0.10 v7.1.6 v7.2.3 v8.0.4 v8.1.2

Compare with:

define_attribute_method(attr_name)

Declares an attribute that should be prefixed and suffixed by ActiveModel::AttributeMethods.

To use, pass an attribute name (as string or symbol), be sure to declare define_attribute_method after you define any prefix, suffix or affix method, or they will not hook in.

class Person
  include ActiveModel::AttributeMethods

  attr_accessor :name
  attribute_method_suffix '_short?'

  # Call to define_attribute_method must appear after the
  # attribute_method_prefix, attribute_method_suffix or
  # attribute_method_affix declares.
  define_attribute_method :name

  private

  def attribute_short?(attr)
    send(attr).length < 5
  end
end

person = Person.new
person.name = 'Bob'
person.name        # => "Bob"
person.name_short? # => true

Parameters

attr_name req

Source

# File activemodel/lib/active_model/attribute_methods.rb, line 284
      def define_attribute_method(attr_name)
        attribute_method_matchers.each do |matcher|
          method_name = matcher.method_name(attr_name)

          unless instance_method_already_implemented?(method_name)
            generate_method = "define_method_#{matcher.method_missing_target}"

            if respond_to?(generate_method, true)
              send(generate_method, attr_name)
            else
              define_proxy_call true, generated_attribute_methods, method_name, matcher.method_missing_target, attr_name.to_s
            end
          end
        end
        attribute_method_matchers_cache.clear
      end

Defined in activemodel/lib/active_model/attribute_methods.rb line 284 · View on GitHub · Improve this page · Find usages on GitHub

Defined in ActiveModel::AttributeMethods::ClassMethods

Signature

Parameters