我如何模拟Rails和GWT的PUT / DELETE？ [英] How can I emulate PUT/DELETE for Rails and GWT?

问题描述

我想让我的应用程序符合REST标准。我在后端使用Rails，在前端使用 GWT 。我想做更新和删除。我意识到我可以做一些像mydomain.com/:id/delete（GET）并完成同样的事情。不过，正如我之前所说的，我希望有一个符合REST的后端。因此，我想要做mydomain.com/:id（DELETE）并隐式调用我的delete方法。

现在，我的理解是，如果浏览器浏览器是GWT的RequestBuilder）不支持DELETE / GET，Rails以某种方式用POST和其他一些url参数完成这个任务。那么，我该如何用GWT RequestBuilder完成这项工作？

Rails用隐藏属性来做到这一点。最简单的方法是创建一个新的rails应用程序，生成一个脚手架并查看浏览器中的HTML。

试试这个：

p>

  rails jp 
 cd jp 
 ./script/generate scaffold RequestBuilder名称：string 
 rake db ：迁移
 ./script/server 
  

然后导航到 http：// localhost：3000 / request_builders ，点击New并查看HTML。您会看到如下所示的内容：

 < form action =/ request_buildersclass =new_request_builder
 id =new_request_buildermethod =post> 
< div style =margin：0; padding：0> 
< input name =authenticity_tokentype =hiddenvalue =e76 .../> 
< / div> 
  

这是一个创建，方法是POST。输入名称，保存然后编辑：

 < form action =/ request_builders / 1class =edit_request_builder
 id =edit_request_builder_1method =post> 
< div style =margin：0; padding：0> 
< input name =_ methodtype =hiddenvalue =put/> 
< input name =authenticity_tokentype =hiddenvalue =e76 .../> 
< / div> 
  

当然，表单是通过POST发送的，但Rails有一个隐藏字段来模拟PUT请求。

  var m = document.createElement（'input' ）; 
 m.setAttribute（'type'，'hidden'）; 
 m.setAttribute（'name'，'_method'）; 
 m.setAttribute（'value'，'delete'）; 
  

要使用另一个前端工作，您必须同时使用这两个工具：

• 使用相同样式的URL，例如/ request_builders / 1（RESTful URL）


• 包含隐藏字段（Rails技巧）

I would like to make my application somewhat REST compliant. I am using Rails on the backend and GWT on the frontend. I would like to do updates and deletes. I realize I can do something like mydomain.com/:id/delete (GET) and accomplish the same thing. However, as I stated previously, I would like to have a REST compliant backend. Thus, I want to do mydomain.com/:id (DELETE) and have it implicitly call my delete method.

Now, it's my understanding that if a browser (my browser is GWT RequestBuilder) doesn't support DELETE/GET, Rails somehow accomplishes this task with a POST and some other url parameter. So, how can I accomplish this with a GWT RequestBuilder?

解决方案

Rails does this with hidden attributes. The easiest way to figure this out would be to create a new rails application, generate a scaffold and have a look at the HTML in a browser.

Try this:

rails jp
cd jp
./script/generate scaffold RequestBuilder name:string
rake db:migrate
./script/server 

Then navigate to http://localhost:3000/request_builders, click on New and have a look at the HTML. You'll see something like:

<form action="/request_builders" class="new_request_builder" 
  id="new_request_builder" method="post">
  <div style="margin:0;padding:0">
    <input name="authenticity_token" type="hidden" value="e76..." />
  </div>

This is a creation, method is POST. Enter a name, save then Edit:

<form action="/request_builders/1" class="edit_request_builder" 
  id="edit_request_builder_1" method="post">
  <div style="margin:0;padding:0">
    <input name="_method" type="hidden" value="put" />
    <input name="authenticity_token" type="hidden" value="e76..." />
  </div>

Of course the form is sent with POST, but Rails hads a hidden field to simulate a PUT request. Same for deletion, but the scaffold will do it with a bit of Javascript:

var m = document.createElement('input'); 
m.setAttribute('type', 'hidden'); 
m.setAttribute('name', '_method'); 
m.setAttribute('value', 'delete');

To have this work with another front-end, you'll have to both:

• Use the same style URL such as /request_builders/1 (RESTful URLs)
• Include the hidden fields (Rails trick)

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