我遇到了这个奇怪的错误，我的代码昨天运行良好（通过自动化测试）但今天就坏了。基本上，感觉好像@api_view 装饰器坏了，无法申请一个方法。情况如下：
我有一个名为“advance_orders”的方法，它的包装如下：
@api_view(http_method_names=['POST'], hack=True)
@permission_classes((IsAuthenticated,))
@check_wallet_token
@disallow_disabled_users
def advance_orders(request):
# code that is irrelevant for this issue
注意： hack=True 是我在第一次发现错误后为调试目的而添加的一个小功能。
这些方法在这里@check_wallet_token也@disallow_disabled_users无关紧要，我 99.99% 确定它们不是错误的来源（因为它们昨天工作罚款和在/在其他类似包装的方法中）
到函数的 url 映射是：
re_path(r'^vendor/orders/advance/$', vendor.advance_orders, name='advance_order'),
现在，在某个测试中，我有：
client = RequestsClient()
# absolute_url == http://testserver/wallet/vendor/orders/advance/
# there are some helper methods which generate it...
# the headers are irrelevant honestly
r = client.post(absolute_url, headers=self.headers, data={"order_id": "asdf"})
print(r.text)
self.assertEqual(r.status_code, 400)
self.assertEqual(json.loads(r.text), {"display_message": "Missing order_id (int)."})
测试失败并在打印我发现的响应文本时：
{"detail":"Method \"POST\" not allowed."}
这没有任何意义！除非我做错了什么，我很确定我不是。
++++++++++++++++++++++++++++++++++++++++++++++++++++++ +++++++++++++++++++++++++
现在是我收集更多证据的时候了。我进入安装在我的虚拟环境中的 DRF 的源代码并修改两种方法以打印出额外的调试信息。
在views.py中我改变views.APIView.dispatch()如下：
def dispatch(self, request, *args, **kwargs):
"""
`.dispatch()` is pretty much the same as Django's regular dispatch,
but with extra hooks for startup, finalize, and exception handling.
"""
self.args = args
self.kwargs = kwargs
request = self.initialize_request(request, *args, **kwargs)
self.request = request
self.headers = self.default_response_headers # deprecate?
hack = False
if request.META['PATH_INFO'] == '/wallet/vendor/orders/advance/':
print("[HACK - views.py] Method identified as advance_order")
hack = True
try:
self.initial(request, *args, **kwargs)
# Get the appropriate handler method
if request.method.lower() in self.http_method_names:
handler = getattr(self, request.method.lower(),
self.http_method_not_allowed)
else:
print("[HACK - views.py] list of http_method_names associated with the function: {}".format(self.http_method_names))
handler = self.http_method_not_allowed
response = handler(request, *args, **kwargs)
except Exception as exc:
response = self.handle_exception(exc)
# and so on as usual...
我修改的另一种方法是decorators.api_view()：
def api_view(http_method_names=None, exclude_from_schema=False, hack=False):
"""
Decorator that converts a function-based view into an APIView subclass.
Takes a list of allowed methods for the view as an argument.
"""
http_method_names = ['GET'] if (http_method_names is None) else http_method_names
if hack:
print("[HACK - decorators.py] Provided http_method_names: {}".format(http_method_names))
# and so on as usual...
./manage.py test Wallet.tests.test_api_vendors.API_VendorTestCase --failfast
现在我使用并打印我们的结果来运行我的测试：
[HACK - decorators.py] Provided http_method_names: ['POST']
System check identified no issues (0 silenced).
[HACK - views.py] Method identified as advance_order
[HACK - views.py] list of http_method_names associated with the function: ['get', 'options']
{"detail":"Method \"POST\" not allowed."}
F
======================================================================
FAIL: test_advance_order (Wallet.tests.test_api_vendors.API_VendorTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/mnt/CommonShare/Code/DVM/APOGEE/Wallet/tests/test_api_vendors.py", line 231, in test_advance_order
self.assertEqual(r.status_code, 400)
AssertionError: 405 != 400
----------------------------------------------------------------------
Ran 1 test in 0.377s
FAILED (failures=1)
Destroying test database for alias 'default'...
这让我非常困惑，因为这意味着装饰器认识到我想要允许“POST”方法，但是当我的视图“advance_order”被执行时，“POST”不包含在允许的方法列表中。
所以我的问题是：是我的错误吗？如果是这样，怎么做？否则，我能做些什么来解决这样的问题？（删除 __pycache__ 文件不起作用）。
PS为这个非常冗长的问题道歉，我只想非常清楚我的问题。