如何为Rails和GWT模拟PUT / DELETE？

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.

我想使我的应用程序有点REST兼容。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）这样的事情并完成同样的事情。但是，正如我之前所说，我希望有一个REST兼容的后端。因此，我想做mydomain.com/:id（DELETE）并让它隐式调用我的删除方法。

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?

现在，我的理解是，如果浏览器（我的浏览器是GWT RequestBuilder）不支持DELETE / GET，Rails会以某种方式使用POST和其他一些url参数完成此任务。那么，我如何通过GWT RequestBuilder实现这一目标？

2 个解决方案

#1

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.

Rails使用隐藏属性执行此操作。解决这个问题的最简单方法是创建一个新的rails应用程序，生成一个脚手架并在浏览器中查看HTML。

Try this:

尝试这个：

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:

然后导航到http：// localhost：3000 / request_builders，单击New并查看HTML。你会看到类似的东西：

<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:

这是一个创建，方法是POST。输入名称，然后保存，然后编辑：

<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:

当然，表单是通过POST发送的，但是Rails有一个隐藏字段来模拟PUT请求。同样的删除，但脚手架将使用一些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:

要让这个与另一个前端一起工作，你必须同时：

Use the same style URL such as /request_builders/1 (RESTful URLs)
使用相同的样式URL，例如/ request_builders / 1（RESTful URL）
Include the hidden fields (Rails trick)
包括隐藏字段（Rails技巧）

#2

Like @skrat said, the _method=PUT workaround doesn't work for any kind of body where Content-Type is not x-www-form-urlencoded, e.g. XML or JSON. Luckily, there is a header workaround as well:

就像@skrat所说的那样，_method = PUT解决方法对于Content-Type不是x-www-form-urlencoded的任何类型的主体都不起作用，例如： XML或JSON。幸运的是，还有一个标题解决方法：

https://zcox.wordpress.com/2009/06/17/override-the-http-request-method-in-jersey/

So to update a REST resource, just do a POST to its address and add the header X-HTTP-Method-Override: PUT. Rails will interpret this as a PUT to the address.

因此，要更新REST资源，只需对其地址执行POST并添加标头X-HTTP-Method-Override：PUT。 Rails会将此解释为地址的PUT。

#1