Function-based views - Cannot apply DjangoModelPermissions on a view that does not set .querysetor have a.get_queryset() method

[cristiangabor]

Checklist

• I have verified that that issue exists against the master branch of Django REST framework.
• I have searched for similar issues in both open and closed tickets and cannot find a duplicate.
• This is not a usage question. (Those should be directed to the discussion group instead.)
• This cannot be dealt with as a third party library. (We prefer new functionality to be in the form of third party libraries where possible.)
• I have reduced the issue to the simplest possible case.
• I have included a failing test as a pull request. (If you are unable to do so we can still accept the issue.)

Steps to reproduce

Write a functional view and apply DjangoModelPermissions permissions

@api_view(['GET', 'POST', 'DELETE'])
@permission_classes((DjangoModelPermissions,))
def test(request):
    if request.method == 'GET':

Expected behavior

Forbidden: /api/test
[12/Dec/2020 22:04:02] "GET /api/test HTTP/1.1" 403 63

Actual behavior

AssertionError: Cannot apply DjangoModelPermissions on a view that does not set .queryset or have a .get_queryset() method.

[xordoquy]

I don't think I'll be going down that road.
Adding a queryset attribute as proposed in the associated PR will open the pandora's box to an important stream of improvements that would make the function based views bloated - such as, why being limited to a static queryset ?
I'd rather keep the function based views for simpler things and advise to switch to class based view if it is not enough.

[cristiangabor]

I understand,
In our case someone has already written many lines of functional views and we chose to implement this rather than implementing classed based views.

[xordoquy]

Please note that api_view basically set the function into an APIView's method and the various arguments to that class attributes (see https://github.com/encode/django-rest-framework/blob/master/rest_framework/decorators.py#L23 for details).

[Dennis-Asamoah]

@xordoquy,@cristiangabor ,Am having the same issue , is there a work around for it or am obliged to use CBV.