Use aggregation to get the thread images count

boards/models/thread.py

@@ -1,5 +1,5 b''
 import logging
-from django.db.models import Count
+from django.db.models import Count, Sum
 from django.utils import timezone
 from django.core.cache import cache
 from django.db import models
@@ -81,12 +81,8 b' class Thread(models.Model):'
         return self.replies.count()
 
     def get_images_count(self):
-        # TODO Use sum
-        total_count = 0
-        for post_with_image in self.replies.annotate(images_count=Count(
-                'images')):
-            total_count += post_with_image.images_count
-        return total_count
+        return self.replies.annotate(images_count=Count(
+                'images')).aggregate(Sum('images_count'))['images_count__sum']
 
     def can_bump(self):
         """