Rails 3呈现XML

我有Rails 3应用程序(运行Rails RC1),我有以下控制器:

class PluginsController < ApplicationController
  respond_to :html, :xml, :json

  def index
    @plugins = Plugin.all
    respond_with(@plugins)
  end
end

http://localhost:3000/plugins 它工作得很好,向我展示了HTML版本。如果我想 http://localhost:3000/plugins.json

http://localhost:3000/plugins.xml ,我得到以下错误:

Template is missing

Missing template plugins/index with {:locale=>[:en, :en], :formats=>[:xml], 
:handlers=>[:rjs, :haml, :erb, :rhtml, :builder, :rxml]} in view paths 
"/Users/fcoury/Projects/backend/app/views", 
"/Users/fcoury/Projects/backend/vendor/plugins/haml/app/views", 
"/Users/fcoury/.rvm/gems/ree-1.8.7-2010.01@rails3/bundler/gems/
   devise-6754ae7/app/views"

另外,我的ApplicationController非常简单:

class ApplicationController < ActionController::Base
  protect_from_forgery
  layout 'application'
end

我试过从控件中取出布局线,但结果相同。

plugins/index.html.haml .