feat: add pagination to viewsets

[paulov59]

Description

Adding Pagination to Viewsets.

[auvipy]

can you please share code example, of what this change is going to let us do?

[paulov59]

At the moment, it is not possible to use response pagination with ViewSets, and it is necessary to inherit GenericAPIView. However, the concept of ViewSets is to create only what is necessary and inheriting another class, receiving other methods that may be unnecessary in this context, just to use an attribute does not match this and it also decreases performance, since some data may be cached.

Example of paginated return of action in the current ViewSet structure:

from rest_framework import viewsets, generics
from rest_framework.decorators import action

class MyViewSet(viewsets.ViewSet, generics.GenericAPIView):
    queryset = MyModel.objects.all()
    serializer_class = MyModelSerializer

    @action(detail=False, methods=['get'], pagination_class=MyPaginationClass)
    def list_paginated_objects(self, request, *args, **kwargs):
        my_objects = self.paginate_queryset(self.queryset)

        return self.get_paginated_response(MyModelSerializer(my_objects, many=True).data)

With my suggestion, we can perform pagination in the ViewSet, without the need to inherit other classes and their methods.

Example of paginated return of action in the proposed ViewSet structure:

from rest_framework import viewsets
from rest_framework.decorators import action

class MyViewSet(viewsets.ViewSet):
    queryset = MyModel.objects.all()
    serializer_class = MyModelSerializer

    @action(detail=False, methods=['get'], pagination_class=MyPaginationClass)
    def list_paginated_objects(self, request, *args, **kwargs):
        my_objects = self.paginate_queryset(self.queryset)

        return self.get_paginated_response(MyModelSerializer(my_objects, many=True).data)