Added some statistics.

forums/urls.py

@@ -16,6 +16,7 @@
     url(r'tags/(?P<id>[0-9]+)/$', TagDetail.as_view()),
     url(r'tags/', TagList.as_view()),
     url(r'users/', UserList.as_view()),
-    url(r'avatars/(?P<pk>[0-9]+)/$', GravatarLink.as_view())
+    url(r'avatars/(?P<pk>[0-9]+)/$', GravatarLink.as_view()),
+    url(r'stats/', ForumStats.as_view())
 ]
 

forums/views.py

@@ -1,9 +1,11 @@
 from django.contrib.auth.models import User, Group
 from django.dispatch import receiver
-from django.db.models import Case, Count, F, Max, When
+from django.db.models import Avg, Case, Count, F, Max, When
 from rest_framework import generics
 from rest_framework.permissions import AllowAny, DjangoObjectPermissions
 from rest_framework.throttling import UserRateThrottle
+from rest_framework.views import APIView
+from rest_framework.response import Response
 from guardian.shortcuts import assign_perm
 from djoser.signals import user_activated
 
@@ -23,6 +25,21 @@ class StandardThrottle(UserRateThrottle):
     rate = '60/min'  # 1 per second
 
 
+class ForumStats(APIView):
+    def get(self, request, format=None):
+        resp_data = {'post_count': Post.objects.count(),
+                     'topic_count': Post.objects.filter(is_topic=True).count(),
+                     'most_replies': Post.objects.filter(is_topic=True).annotate(reply_count=Count('replies')) \
+                         .aggregate(Max('reply_count'))['reply_count__max'],
+                     'user_most_posts': User.objects.annotate(post_count=Count('posts')).order_by('-post_count')[0] \
+                         .username,
+                     'average_post_per_user': User.objects.annotate(post_count=Count('posts')) \
+                         .aggregate(Avg('post_count'))['post_count__avg'],
+                     'average_replies': Post.objects.filter(is_topic=True).annotate(reply_count=Count('replies')) \
+                         .aggregate(Avg('reply_count'))['reply_count__avg'],
+                     }
+        return Response(resp_data)
+
 class TagDetail(generics.ListAPIView):
     queryset = Post.objects.all()
     serializer_class = TopicSerializer