Rails generate model + migration for --parent

I have a base model MyAppRecordBase which inherits from ActiveRecord::Base and which all other models inherit from. I used (in config/environments/development.rb) config.generators.active_record[:parent] = 'MyAppRecordBase' to make it default. How do I make rails generate model XYZ to create a migration file for new models (it do all exept creating migration file..)?