Pagination in Django-Rest-Framework using API-View

Question

I currently have an API view setup as follows:

class CartView(APIView):
    authentication_classes = [SessionAuthentication, TokenAuthentication]
    permission_classes = [IsAuthenticated, ]
    api_view = ['GET', 'POST']

    def get(self, request, format=None):
        try:
            cart = request.user.cart
        except Cart.DoesNotExist:
            cart = Cart.objects.create(user=request.user)
        cart_details = cart.cart_details.all()
        serializer = CartDetailSerializer(cart_details, many=True, fields=['id', 'item', 'quantity', 'product_type'])
        return Response(serializer.data)

Here CartDetailSerializer is a normal ModelSerializer.

I want to paginate this API. However, in the docs of DRF, I found this:

If you're using a regular APIView, you'll need to call into the pagination API yourself to ensure you return a paginated response.

There is no example provided on how to paginate a regular APIView API.

Can anyone post an example which I can use in above scenario.

Thanks.

Answer 1

When using regular APIView, you need to use Django's own Paginator class.

Django Pagination in Views

In your case you can paginate queryset before sending it to serializer.

Something like this:

def get(self, request, format=None):
    try:
        cart = request.user.cart
    except Cart.DoesNotExist:
        cart = Cart.objects.create(user=request.user)
    cart_details = cart.cart_details.all()

    paginator = Paginator(cart_details, 10)
    page = request.GET.get('page')

    try:
        cart_details = paginator.page(page)
    except PageNotAnInteger:
        # If page is not an integer, deliver first page.
        cart_details = paginator.page(1)
    except EmptyPage:
        # If page is out of range (e.g. 9999), deliver last page of results.
        cart_details = paginator.page(paginator.num_pages)
    serializer = CartDetailSerializer(cart_details, many=True, fields=['id', 'item', 'quantity', 'product_type'])
    return Response(serializer.data)

Hope this helps.