django - 在 Django REST 中引发异常

Question

我正在尝试测试 django rest 框架中的异常。
基于 http://www.django-rest-framework.org/api-guide/exceptions/提高 NotFound，

By default this exception results in a response with the HTTP status code "404 Not Found".

但是，当我发出 GET(到/example1)时，我得到了 500，

Request Method: GET
Request URL:    http://192.168.59.103:8002/example1
Django Version: 1.8.3
Exception Type: NotFound
Exception Value:    
not found
Exception Location: /home/djangoapp/testtools/api/views.py in example1, line 7
Python Executable:  /usr/bin/python

详情如下，

设置.py

REST_FRAMEWORK = {'EXCEPTION_HANDLER':'rest_framework.views.exception_handler'}

INSTALLED_APPS = (
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'rest_framework',
)

urls.py

from django.conf.urls import include, url
from api import views

urlpatterns = [
    url(r'example1', views.example1),
]

View .py

from rest_framework import status
from rest_framework.decorators import api_view
from rest_framework.response import Response
from rest_framework.exceptions import APIException,ParseError,NotFound

def example1(request):                                                                                                                               
    raise NotFound("not found")

有任何想法吗 ？

Answer 1

from rest_framework.exceptions import NotFound

类(class) NotFound扩展自 APIException . APIException 的默认状态码是 500 Internal Server Error , 而对于 NotFound是 404 .

所以根据我这里的说法，您正在尝试抛出 rest framework纯 Django View 中的异常。我在这里写了一个测试用例来检查出现错误的几率是多少。猜猜想提出一个多么简单的 Django View rest framework异常不会被识别为 View 错误。但是在提供装饰器并将其声明为 API View 时，它会进入 exception_handler
所以当你这样做时:

from rest_framework.decorators import api_view

@api_view()
def example1(request):
    raise NotFound('not found')

这现在被识别为 API 抛出的异常，该异常进入默认值 rest_framework EXCEPTION_HANDLER由您提供，它返回任何给定异常的响应。

它的 docstring说:

Returns the response that should be used for any given exception. By default we handle the REST framework APIException, and also Django's built-in ValidationError, Http404 and PermissionDenied exceptions. Any unhandled exceptions may return None, which will cause a 500 error to be raised.