python之在 Django 2 中使用 URLPathVersioning 处理版本控制

我最近在尝试将我的 REST API 设置为使用路径版本控制时遇到了一些麻烦。

我在 my_app/urls.py 中有代码:

def ping(): 
    return "pong" 
 
 
API_PREFIX = r'^(?P<version>(v1))' 
 
urlpatterns = [ 
    url(r'^admin/', admin.site.urls), 
    url(f'^{API_PREFIX}/ping/$', get_json(ping))) # assume that get_json returns the right thing 
] 

我将这行添加到同一目录中的 settings.py 中:

REST_FRAMEWORK = { 
    'DEFAULT_VERSIONING_CLASS': 'rest_framework.versioning.URLPathVersioning' 
    'DEFAULT_VERSION': 'v1', 
    'ALLOWED_VERSIONS': ('v1',), 
} 

如果我执行 GET localhost:8000/v1/ping/，这将不起作用。 f 字符串是否能够包含 regex 语法，或者问题出在其他地方？我试过 fr'^{(API_PREFIX}}/ping/$' 也没有用。

奖励问题:在 ping 函数中，我如何访问和检查路径中传递的版本号(在这种情况下为 1，但会随时间变化)？

请您参考如下方法:

我发现了问题。文档中的这一段概述了我面临的问题；

Using unnamed regular expression groups¶ As well as the named group syntax, e.g. (?P[0-9]{4}), you can also use the shorter unnamed group, e.g. ([0-9]{4}).

This usage isn’t particularly recommended as it makes it easier to accidentally introduce errors between the intended meaning of a match and the arguments of the view.

> In either case, using only one style within a given regex is recommended. When both styles are mixed, any unnamed groups are ignored and only named groups are passed to the view function.