如何在rails中获取JSON ajax请求的数据？

Question

我试图做一个简单的PUT JSON要求我的Rails应用程序3：

$.ajax({type: 'PUT', url: '/controlpanel/custom_forms/1', data: { hello: 'world' }, contentType: 'json'}) 

不知何故，该数据不接收params只包含ID。下面是在服务器端：

Started PUT "/controlpanel/custom_forms/1" for 127.0.0.1 at 2012-05-22 23:05:25 -0400 
Processing by Controlpanel::CustomFormsController#update as */* 
    Parameters: {"id"=>"1"} 

我期待Parameters是{"id"=>"1", "hello"=>"world"}

请求看起来很好，在Chrome：

请求头

PUT /controlpanel/custom_forms/1 HTTP/1.1 
Host: localhost:3000 
Connection: keep-alive 
Content-Length: 11 
Origin: localhost:3000 
X-CSRF-Token: HgGPJmgf0iXlsHtmZrifqFoww/rlzq+hAKb63HbAl8g= 
X-Requested-With: XMLHttpRequest 
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_6_8) AppleWebKit/536.5 (KHTML, like Gecko) Chrome/19.0.1084.46 Safari/536.5 
Content-Type: json 
Accept: */* 
Referer: http://localhost:3000/controlpanel/custom_forms/1/edit?feature_id=1 
Accept-Encoding: gzip,deflate,sdch 
Accept-Language: en-US,en;q=0.8 
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3 
Cookie: user_credentials=whatever 

请求负载

hello=world 

我在做什么错？

Answer 1

我犯了两个错误。首先，contentType必须设置为application/json，而不仅仅是json。其次，data必须手动序列化与JSON.stringify({...})。