rails 3呈现json并包含来自数组的配置文件

所有用户都有一个配置文件

目前有：

render :json => @user, :include => [:friends, :requested_friends]

希望包括好友和请求好友的配置文件

我知道对于单个包含，我可以使用它

render :json => @user, :include => {:requested_friends => {:include => :profile}}

但我们需要这样的东西：

render :json => @user, :include => {[:friends, :requested_friends] => {:include => :profile}}

那么：

render :json    => @user,
       :include => {
           :requested_friends => { :include => :profile },
           :friends           => { :include => :profile }
       }