Rails core - Jul 2011 - how to use rails g command in rails 3.1 engine path

I use rails3.1 edge. i run rails g model post title:string
body:text  ,
      invoke  active_record
      create    db/migrate/20110710035713_create_posts.rb
      create    app/models/post.rb
      invoke    test_unit
      create      test/unit/post_test.rb
      create      test/fixtures/posts.yml


but this files were created in test/dummy path,,how can i use the
rails g command to create files in  engine path

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