method

alias_attribute

v5.1.7 - Show latest stable - Class: Module

alias_attribute(new_name, old_name)

public

Allows you to make aliases for attributes, which includes getter, setter, and a predicate.

class Content < ActiveRecord::Base
  # has a title attribute
end

class Email < Content
  alias_attribute :subject, :title
end

e = Email.find(1)
e.title    # => "Superstars"
e.subject  # => "Superstars"
e.subject? # => true
e.subject = "Megastars"
e.title    # => "Megastars"

# File activesupport/lib/active_support/core_ext/module/aliasing.rb, line 19
  def alias_attribute(new_name, old_name)
    # The following reader methods use an explicit `self` receiver in order to
    # support aliases that start with an uppercase letter. Otherwise, they would
    # be resolved as constants instead.
    module_eval       def #{new_name}; self.#{old_name}; end          # def subject; self.title; end      def #{new_name}?; self.#{old_name}?; end        # def subject?; self.title?; end      def #{new_name}=(v); self.#{old_name} = v; end  # def subject=(v); self.title = v; end, __FILE__, __LINE__ + 1
  end

1Note

Deprecated - replacement method

taryneast · Mar 27, 20092 thanks

The description rightly lists this as deprecated, but using it will still work atm, as it seems to have moved to ActiveSupport::CoreExtensions::Module instead.

So your code should still work.

alias_attribute

1Note

Deprecated - replacement method

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