Rails 的 link_to 方法:获取何时应该删除 [英] Rails' link_to method: GETing when it should DELETE

问题描述

我正在关注 Michael Hartl 的 Rails 教程，出于某种原因，以下代码:

I'm following Michael Hartl's Rails Tutorial, and for some reason the following code:

<%= link_to 'delete', user, :method => :delete, :confirm => "You sure?",
                                :title => "Delete #{user.name}" %>

发出 GET 请求(正如我通过检查 rails 服务器日志所验证的那样).我还验证了以下行在我的应用程序视图中:

Issues a GET request (as I verified by checking the rails server log). I also verified that the following line is in my application view:

<%= javascript_include_tag :all %>

有一件事我不太明白，这可能是我问题的根源:删除"方法在哪里定义?我在 Hartl 的源代码中验证了他在控制器，而不是删除".但即使我将 link_to 更改为 :method => :destroy，它也只会发出 GET.

One thing I didn't quite understand, and it's probably the source of my problem: where is the "delete" method defined? I verified in Hartl's source code that he defines a "destroy" method in the controller, not "delete". But even if I change the link_to to :method => :destroy, it just issues a GET.

我使用的是 Rails 3.1.有什么提示吗?

I'm using Rails 3.1. Any tips?

推荐答案

大多数浏览器实际上并不支持 DELETE 动词，因此 Rails 通过修改它生成的 HTML 来伪造它.Rails 添加了一个名为 data-method 的 HTML5 属性，并将其设置为 "delete".所以当用户点击链接时，它实际上是作为一个 GET 请求发出的，但是 data-method 属性允许一些 Rails 魔法，意味着你的路由代码应该识别将其作为 DELETE 请求.

Most browsers don't actually support the DELETE verb, so Rails fakes it by modifying the HTML it generates. Rails tacks on a HTML5 attribute called data-method and sets it to "delete". So when a user clicks on the link, it is actually issued as a GET request, but the data-method attribute allows for some Rails magic and means your routing code should recognize it as a DELETE request.

您可以在控制台中自行测试.运行 bundle exec rails c 进入控制台，查看生成的 HTML:

You can test it yourself in the console. Run bundle exec rails c to get into the console, and look at the HTML that this generates:

helper.link_to "delete", "foobar/delete", :method => 'delete'

HTML 应如下所示:

The HTML should look like this:

<a href="foobar/delete" data-method="delete" rel="nofollow">delete</a>

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