Method: ActiveModel::AttributeMethods::ClassMethods#alias_attribute

Defined in:
lib/active_model/attribute_methods.rb

#alias_attribute(new_name, old_name) ⇒ Object

Allows you to make aliases for attributes.

class Person
  include ActiveModel::AttributeMethods

  attr_accessor :name
  attribute_method_suffix '_short?'
  define_attribute_methods :name

  alias_attribute :nickname, :name

  private

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

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



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# File 'lib/active_model/attribute_methods.rb', line 208

def alias_attribute(new_name, old_name)
  self.attribute_aliases = attribute_aliases.merge(new_name.to_s => old_name.to_s)
  attribute_method_matchers.each do |matcher|
    matcher_new = matcher.method_name(new_name).to_s
    matcher_old = matcher.method_name(old_name).to_s
    define_proxy_call false, self, matcher_new, matcher_old
  end
end