/ Ruby
/
method

inherited

v1_8_6_287 - Show latest stable - Class: Class
inherited(p1)
public

Callback invoked whenever a subclass of the current class is created.

Example: 

   class Foo
      def self.inherited(subclass)
         puts "New subclass: #{subclass}"
      end
   end

   class Bar < Foo
   end

   class Baz < Bar
   end

produces: 

   New subclass: Bar
   New subclass: Baz

1Note

Interesting usage for polymorphic asset model :)

stevo ยท Jan 22, 20101 thank

...to automatically define default scopes of inherited classes.

class Asset < ActiveRecord::Base

belongs_to :resource, :polymorphic => true before_save :set_asset_type

def set_asset_type self.asset_type = self.class.name end

def self.inherited(subclass) super subclass.send(:default_scope, :conditions => "asset_type='#{subclass.name}'") end end