rspec – 让factory_girl在Rails3中工作

gem "rspec"
gem "rspec-rails"
gem "factory_girl_rails"

application.rb中的生成器如下：

config.generators do |g|
      g.test_framework :rspec,:fixture => true,:views => false,:fixture_replacement => :factory_girl
  end

然后,使用生成器创建新模型：

> rails g model Addon name:string

  invoke  active_record
  create    db/migrate/20101223205918_create_addons.rb
  create    app/models/addon.rb
  invoke    rspec
  create      spec/models/addon_spec.rb
   error      factory_girl [not found]

我想念什么？我确实运行了捆绑安装…我试过四处寻找,但在factory_girl和rails3上找不到任何体面的文档.