diff --git a/src/newsreader/news/core/endpoints.py b/src/newsreader/news/core/endpoints.py
index 184515b..39a8ecb 100644
--- a/src/newsreader/news/core/endpoints.py
+++ b/src/newsreader/news/core/endpoints.py
@@ -1,3 +1,4 @@
+from django.db.models import Prefetch
 from rest_framework import status
 from rest_framework.generics import (
     GenericAPIView,
@@ -11,6 +12,7 @@ from rest_framework.response import Response
 
 from newsreader.accounts.permissions import IsPostOwner
 from newsreader.core.pagination import CursorPagination
+from newsreader.news.collection.models import CollectionRule
 from newsreader.news.collection.serializers import RuleSerializer
 from newsreader.news.core.filters import ReadFilter, SavedFilter
 from newsreader.news.core.models import Category, Post
@@ -63,10 +65,9 @@ class NestedRuleCategoryView(ListAPIView):
 
 
 class NestedPostCategoryView(ListAPIView):
-    queryset = Category.objects.prefetch_related("rules", "rules__posts").all()
     serializer_class = PostSerializer
     pagination_class = CursorPagination
-    filter_backends = [ReadFilter]
+    filter_backends = [ReadFilter] # TODO: remove read filter usage
 
     def get_queryset(self):
         lookup_url_kwarg = self.lookup_url_kwarg or self.lookup_field
@@ -75,13 +76,18 @@ class NestedPostCategoryView(ListAPIView):
         # filtered on the user.
         filter_kwargs = {self.lookup_field: self.kwargs[lookup_url_kwarg]}
 
-        category = get_object_or_404(self.queryset, **filter_kwargs)
+        rules_queryset = CollectionRule.objects.filter(user=self.request.user)
+        prefetch = Prefetch("rules", queryset=rules_queryset, to_attr="user_rules")
+        category_queryset = (
+            Category.objects
+            .prefetch_related(prefetch)
+            .filter(user=self.request.user)
+        )
+        category = get_object_or_404(category_queryset, **filter_kwargs)
+
         self.check_object_permissions(self.request, category)
 
-        rules = category.rules.values_list("id", flat=True)
-        queryset = Post.objects.filter(rule__in=rules)
-
-        return queryset
+        return Post.objects.filter(rule__in=category.user_rules, read=False)
 
 
 class CategoryReadView(GenericAPIView):