pagination for statement feed

social_network/the_social_network/urls/contentUrls.py

@@ -6,5 +6,6 @@ urlpatterns = [
     path('statements/get/<int:id>/', ShowStatement.as_view(), name="show_statement"),
     path('statements/with/hashtag/', ShowStatementsWithHashtag.as_view(), name="show_statement_with_hashtag"),
     path('statements/feed/', ShowStatementFeed.as_view(), name="show_statement_feed"),
+    path('statements/feed/pagination', ShowStatementFeedPagination.as_view(), name="show_statement_feed_pagination"),
     path('trending/hashtag/', ShowTrendingHashtag.as_view(), name="show_trending_hashtags"),
 ]
\ No newline at end of file

social_network/the_social_network/views/contentViews.py

@@ -82,7 +82,6 @@ class ShowStatementFeed(APIView):
     def get(request: Request):
         """
         This is for getting the feed.
-        Todo: Add pagination for infinite scrolling.
         :param request: The request containing the token to identify the calling user.
         :return: Feed for the calling user based on the actions of those the calling account follows.
         """
@@ -91,6 +90,47 @@ class ShowStatementFeed(APIView):
         feed: QuerySet[Statement] = Statement.objects.filter(author__in=following)
         serializer: StatementSerializer = StatementSerializer(instance=feed, many=True)
         return Response(status=status.HTTP_200_OK, data=serializer.data)
+    
+    
+class ShowStatementFeedPagination(APIView):
+    """
+    This view is for querying the feed for an calling account.
+    The feed is generated by the accounts the calling account is following.
+    To get the feed the calling account must be authenticated.
+    """
+    authentication_classes = [TokenAuthentication]
+    permission_classes = (IsAuthenticated,)
+
+    @staticmethod
+    def get(request: Request):
+        """
+        This is for getting the feed with pagination.
+        Todo: Add pagination for infinite scrolling.
+        :param request: The request containing the token to identify the calling user. The page number. The size number.
+        :return: Feed for the calling user based on the actions of those the calling account follows.
+        """
+        page: int = int(request.query_params.get('page', None))
+        size: int = int(request.query_params.get('size', None))
+        if not page or not size or page <= 0 or size <= 0:
+            return Response(status=status.HTTP_400_BAD_REQUEST)
+        
+        account: Account = Account.objects.get(user=request.user)
+        following: List[Account] = account.get_related_to() + [account]
+        feed: QuerySet[Statement] = Statement.objects.filter(author__in=following)
+        
+        first = (page - 1) * size
+        last = first + size
+        total: int = feed.count()
+        
+        if first >= total:
+            feed = []
+        else:
+            if last >= total:
+                last = None
+                feed = feed[first:last]
+        
+        serializer: StatementSerializer = StatementSerializer(instance=feed, many=True)
+        return Response(status=status.HTTP_200_OK, data={"data": serializer.data, "total": total})
 
 
 class ShowTrendingHashtag(APIView):
@@ -114,9 +154,7 @@ class ShowTrendingHashtag(APIView):
         :return: 200 OK with empty or not empty data section. The data section is empty if there are not hashtags.
         """
         hashtags: QuerySet[Dict] = HashtagTagging.objects.values('hashtag')
-        hashtags_counted: QuerySet[Dict] = hashtags.annotate(
-            the_count=Count('hashtag')
-        ).order_by("-the_count")
+        hashtags_counted: QuerySet[Dict] = hashtags.annotate(the_count=Count('hashtag')).order_by("-the_count")
         counted: Dict = {item["hashtag"]: item["the_count"] for item in hashtags_counted}
         hashtags: QuerySet[Hashtag] = Hashtag.objects.filter(id__in=counted.keys())
         if not hashtags_counted: