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我试图弄清楚为什么服务器上的 JSON 与使用 Restkit 在我的移动应用程序中收到的不同。当我用 来查看我的对象的 JSON 表示时puts @items.to_json，我得到以下信息：

[{"item":{"created_at":"2012-04-19T19:42:44Z","id":4,"json_event_id":null,"name":"Biz Cards","theme_id":null,"updated_at":"2012-04-19T19:42:44Z","url":"","user_id":3}},
 {"item":{"created_at":"2012-04-20T19:37:33Z","id":5,"json_event_id":null,"name":"Hummus","theme_id":null,"updated_at":"2012-04-20T19:37:33Z","url":"","user_id":3}},
 {"item":{"created_at":"2012-04-20T20:01:57Z","id":7,"json_event_id":null,"name":"Wine","theme_id":null,"updated_at":"2012-04-20T20:01:57Z","url":"","user_id":3}},
 {"item":{"created_at":"2012-04-25T19:57:33Z","id":9,"json_event_id":null,"name":"this","theme_id":null,"updated_at":"2012-04-25T19:57:33Z","url":"","user_id":3}}]

但是，当我查看在客户端收到的 JSON 时，我会得到一个新的 JSON 元素，其中包含所有空值，包括 ID（此处的最后一个元素）：

[{"item":{"created_at":"2012-04-19T19:42:44Z","id":4,"json_event_id":null,"name":"Biz Cards","theme_id":null,"updated_at":"2012-04-19T19:42:44Z","url":"","user_id":3}},
 {"item":{"created_at":"2012-04-20T19:37:33Z","id":5,"json_event_id":null,"name":"Hummus","theme_id":null,"updated_at":"2012-04-20T19:37:33Z","url":"","user_id":3}}, 
 {"item":{"created_at":"2012-04-20T20:01:57Z","id":7,"json_event_id":null,"name":"Wine","theme_id":null,"updated_at":"2012-04-20T20:01:57Z","url":"","user_id":3}}, 
 {"item":{"created_at":"2012-04-25T19:57:33Z","id":9,"json_event_id":null,"name":"this","theme_id":null,"updated_at":"2012-04-25T19:57:33Z","url":"","user_id":3}}, 
 {"item":{"created_at":null,"id":null,"json_event_id":null,"name":null,"theme_id":null,"updated_at":null,"url":null,"user_id":3}}]

为什么@items.to_json返回与 JSON 不同的 JSON format.json { render json: @items }，我该如何以正确的方式响应@items.to_json？

编辑 这是填充@items的代码：

@items = current_user.items

编辑 这似乎也只发生在我根据 current_user 填充@items 时：

@items = current_user.items

当我做所有事情时，没有额外的空对象：

@items = Item.all
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