Django Rest Framework: Exception handler not working

Question

The Django Rest Framework exception handler doesn't seem to be working for me. ValidationErrors are getting turned into 500 responses.

When a ValidationError is raised, it doesn't get converted into a 400.

Traceback (most recent call last):
  File "/example/.local/lib/python3.6/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
  File "/example/.local/lib/python3.6/site-packages/django/core/handlers/base.py", line 115, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/example/.local/lib/python3.6/site-packages/django/core/handlers/base.py", line 113, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/example/.local/lib/python3.6/site-packages/django/views/generic/base.py", line 71, in view
    return self.dispatch(request, *args, **kwargs)
  File "/example/.local/lib/python3.6/site-packages/django/views/generic/base.py", line 97, in dispatch
    return handler(request, *args, **kwargs)
  File "/example/app/views.py", line 25, in post
    serializer.is_valid(raise_exception=True)
  File "/example/.local/lib/python3.6/site-packages/rest_framework/serializers.py", line 242, in is_valid
    raise ValidationError(self.errors)
rest_framework.exceptions.ValidationError: {'email': [ErrorDetail(string='Enter a valid email address.', code='invalid')]}
[26/Feb/2020 20:44:54] "POST /login/ HTTP/1.1" 500 84465

In settings.py I have

INSTALLED_APPS = [
    # ...
    'rest_framework',
]

But I get the same behavior whether I have rest_framework in my INSTALLED_APPS or not.

Adding this to settings.py has no effect either:

REST_FRAMEWORK = {
    'EXCEPTION_HANDLER': 'bla',
}

Am I missing something obvious?

Alex L · Accepted Answer · 2020-03-01 06:37:01Z

2

It turns out it depends on the view you're sub-classing while throwing the exception.

I was subclassing View, which did not work:

from rest_framework import views
from rest_framework.exceptions import ValidationError


class LoginView(views.View):
    def post(self, request):
        raise ValidationError()

Switching to using GenericAPIView fixed my issue:

from rest_framework import generics
from rest_framework.exceptions import ValidationError


class LoginView(generics.GenericAPIView):
    def post(self, request):
        raise ValidationError()

answered Mar 1, 2020 at 6:37

Alex L

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