了解“发布/重定向/获取"消息.图案 [英] Understanding the "post/redirect/get" pattern

问题描述

我很难理解发布/重定向/获取"的确切过程.

I am having a very hard time understanding the exact process of "post/redirect/get".

我已经在这个网站和网络上梳理了几个小时，除了这里的概念"之外，找不到任何东西.

I have combed through this site and the web for several hours and cannot find anything other than "here's the concept".

如何理解发布/重定向/获取模式?

How to understand the post/redirect/get pattern?

推荐答案

您可能会从

As you may know from your research, POST-redirect-GET looks like this:

• 客户获得带有表单的页面.
• 服务器的POST形式.
• 服务器执行该操作，然后重定向到另一个页面.
• 客户端遵循重定向.

• The client gets a page with a form.
• The form POSTs to the server.
• The server performs the action, and then redirects to another page.
• The client follows the redirect.

例如，假设我们具有以下网站结构:

For example, say we have this structure of the website:

• /posts(显示帖子列表和添加帖子"的链接)
  • /<id>(查看特定帖子)
  • /create(如果通过GET方法请求，则将表单发布返回到其自身；如果是POST请求，则创建该帖子并重定向到/<id>端点)
  • /posts (shows a list of posts and a link to "add post")
    • /<id> (view a particular post)
    • /create (if requested with the GET method, returns a form posting to itself; if it's a POST request, creates the post and redirects to the /<id> endpoint)

    /posts本身与该特定模式无关，所以我将其省略.

    /posts itself isn't really relevant to this particular pattern, so I'll leave it out.

    /posts/<id>可以这样实现:

    • 在数据库中找到具有该ID的帖子.
    • 呈现包含该帖子内容的模板.

    /posts/create可以这样实现:

    • 如果请求是GET请求:
      • 显示一个空表单，目标设置为自身，方法设置为POST.
      • If the request is a GET request:
        • Show an empty form with the target set to itself and the method set to POST.
        • 验证字段.
        • 如果存在无效字段，请再次显示该表单并指出错误.
        • 否则，如果所有字段均有效:
          • 将帖子添加到数据库中.
          • 重定向到/posts/<id>(其中<id>从调用返回到数据库)
          • Validate the fields.
          • If there are invalid fields, show the form again with errors indicated.
          • Otherwise, if all fields are valid:
            • Add the post to the database.
            • Redirect to /posts/<id> (where <id> is returned from the call to the database)

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