Solved cache invalidation problem when user do paginate

backend/apps/pet/pagination.py

@@ -5,3 +5,12 @@
 # !PetPagination
 class PetPagination(PageNumberPagination):
     page_size = 2  # Set the number of items per page
+    cursor_query_param = "page"
+
+    def get_paginated_response(self, data):
+        return Response(
+            {
+                "count": self.page.paginator.count,
+                "pets": data,
+            }
+        )

backend/apps/pet/serializers.py

@@ -7,6 +7,7 @@
 class PetSerializer(serializers.ModelSerializer):
     # created = serializers.DateTimeField(format="%Y-%m-%d")
     # modified = serializers.DateTimeField(format="%Y-%m-%d")
+    # obj_count = serializers.SerializerMethodField()
 
     class Meta:
         model = Pet

backend/apps/pet/views.py

@@ -34,18 +34,22 @@ def get(self, request):
             Response: A response object containing the serialized data of all pets and the HTTP status code.
         """
         pet_objects = cache.get("pet_objects")
+        pet_count = cache.get("pet_count")
+        page_number = cache.get("page_number")
         paginator = self.pagination_class()  # Use the desired pagination class
 
-        page_number = request.query_params.get("page")
-        print("Page number ", page_number)
+        page = request.query_params.get("page")
 
-        if pet_objects is None:
+        if pet_objects is None or pet_count is None or page_number != page:
             pet_objects = paginator.paginate_queryset(Pet.objects.all(), request)
+            pet_count = Pet.objects.count()
             cache.set("pet_objects", pet_objects, 60 * 3)
+            cache.set("pet_count", pet_count, 60 * 3)
+            cache.set("page_number", page, 60 * 3)
 
-        # pet_objects = Pet.objects.all()
         serializer = self.serializer_class(pet_objects, many=True)
-        return Response(serializer.data, status=status.HTTP_200_OK)
+        response_data = {"pet_count": pet_count, "pet_objects": serializer.data}
+        return Response(response_data, status=status.HTTP_200_OK)
 
     def post(self, request, format=None):
         """