在Flask中寻找url_for的逆函数 [英] Looking for inverse of url_for in Flask

问题描述

我正在使用烧瓶和

I am using Flask and Flask-RESTful to build a REST API. Within this API some of my resources contain url relations to other resources.

对这些资源执行POST请求时，我发现我需要Flask的url_for()函数的逆函数来解析传入的URL.

When performing POST requests to these resources I am finding that I am needing the inverse of Flask's url_for() function to parse the incoming url.

例如，到https://www.example.com/buildings的POST可能包含以下json:

For example, a POST to https://www.example.com/buildings may contain the following json:

{
  "address": "123 Lyall St",
  ...
  "owner": {
      "href": "https://www.example.com/users/21414512"
  },
  "tenant": {
      "href": "https://www.example.com/users/16324642"
  },
}

我想使用以下路由来解析owner和tenant中的ID:

I would like to parse the id out of owner and tenant using the following route:

"https://www.example.com/users/<int:id>"

在Flask或Werkzueg中是否有简便的方法可以做到这一点，还是我应该自己解析网址?能够重新使用已经定义的路由会很好...

Is there a convenient way to do this within Flask or Werkzueg or should I just parse the url myself? It would be nice to be able to re-use the already defined route...

我发现此发布，但似乎并未描述如何在请求之外进行操作.

I found this post but it does not seem to describe how to do it outside of a request.

推荐答案

我在下面使用route_from函数:

from flask.globals import _app_ctx_stack, _request_ctx_stack
from werkzeug.urls import url_parse

def route_from(url, method = None):
    appctx = _app_ctx_stack.top
    reqctx = _request_ctx_stack.top
    if appctx is None:
        raise RuntimeError('Attempted to match a URL without the '
                           'application context being pushed. This has to be '
                           'executed when application context is available.')

    if reqctx is not None:
        url_adapter = reqctx.url_adapter
    else:
        url_adapter = appctx.url_adapter
        if url_adapter is None:
            raise RuntimeError('Application was not able to create a URL '
                               'adapter for request independent URL matching. '
                               'You might be able to fix this by setting '
                               'the SERVER_NAME config variable.')
    parsed_url = url_parse(url)
    if parsed_url.netloc is not "" and parsed_url.netloc != url_adapter.server_name:
        raise NotFound()
    return url_adapter.match(parsed_url.path, method)

我通过查看url_for的实现并将其反转来编写此代码.

I wrote this by looking at the implementation of url_for and reversing it.

url参数可以是完整的URL，也可以只是路径信息部分.返回值是带有端点名称的元组和带有参数的dict.

The url argument can be a complete URL or just the path info portion. The return value is a tuple with the endpoint name and a dict with the arguments.

免责声明:我尚未对其进行广泛的测试.我原本打算最终将它作为请求请求提交，但似乎从来没有经过全面测试并编写了一些单元测试.如果它对您不起作用，请告诉我！

Disclaimer: I haven't tested it extensively. I was planning to eventually submit it as a pull request, but never seem to get around to fully test it and write some unit tests. If it does not work for you, let me know!

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