prompt: We are currently solving the following issue within our repository. Here is the issue text:
  --- BEGIN ISSUE ---
  Count ratings appropriately
  If a contributor rates A versus B on 9 quality criteria, this should count as 9 ratings.
  The home page statistics should reflect this, on not the number of times a contributor rated A versus B :)
  
  --- END ISSUE ---
  
  Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
  --- BEGIN FILES ---
  Path: `backend/backend/api_v2/statistics.py`
  Content:
  ```
  1 from backend.models import ExpertRating, Video, UserInformation
  2 from drf_spectacular.utils import extend_schema
  3 from rest_framework import serializers
  4 from rest_framework import viewsets
  5 from rest_framework.decorators import action
  6 from rest_framework.permissions import IsAuthenticatedOrReadOnly
  7 from rest_framework.response import Response
  8 from backend.rating_fields import VIDEO_FIELDS
  9 from django.db.models import Min, Max, F, Q
  10 from backend.api_v2.helpers import WithPKOverflowProtection
  11 import datetime
  12 from django.utils.timezone import make_aware
  13 
  14 
  15 class StatisticsSerializerV2(serializers.Serializer):
  16     """Serialize statistics for the website."""
  17     certified_experts = serializers.IntegerField(
  18         help_text="Number of experts with certified e-mails")
  19     total_experts = serializers.IntegerField(
  20         help_text="Number of all experts")
  21     pairwise_comparisons = serializers.IntegerField(
  22         help_text="Total number of pairwise comparisons")
  23     videos = serializers.IntegerField(
  24         help_text="Total number of videos in the database")
  25     min_score = serializers.FloatField(
  26         help_text="Minimal aggregated score over all videos and features")
  27     max_score = serializers.FloatField(
  28         help_text="Maximal aggregated score over all videos and features")
  29     weekly_active_ratings = serializers.IntegerField(
  30         help_text="Number of ratings added within a week")
  31     n_rated_videos = serializers.IntegerField(
  32         help_text="Total number of videos with ratings")
  33 
  34 
  35 class StatisticsViewSetV2(viewsets.ViewSet, WithPKOverflowProtection):
  36     """Show website statistics."""
  37     serializer_class = StatisticsSerializerV2
  38     permission_classes = [IsAuthenticatedOrReadOnly]
  39 
  40     # need a list, otherwise router will not register this viewset
  41     @extend_schema(exclude=True, responses={
  42                 200: StatisticsSerializerV2(
  43                     many=True),
  44                 400: None})
  45     def list(self, request):
  46         return Response({})
  47 
  48     @extend_schema(
  49         responses={
  50             200: StatisticsSerializerV2(
  51                 many=False)},
  52         operation_id="view")
  53     @action(methods=['GET'], detail=False)
  54     def view(self, request):
  55         """Get statistics for the website."""
  56         minmax_scores = \
  57             Video.objects.aggregate(**{'max_' + f: Max(F(f)) for f in VIDEO_FIELDS},
  58                                     **{'min_' + f: Min(F(f)) for f in VIDEO_FIELDS})
  59 
  60         try:
  61             min_score = min([v for k, v in minmax_scores.items() if k.startswith('min')])
  62             max_score = max([v for k, v in minmax_scores.items() if k.startswith('max')])
  63         except Exception:
  64             min_score = 0.0
  65             max_score = 0.0
  66 
  67         date_week_ago = make_aware(datetime.datetime.now()) - datetime.timedelta(days=7)
  68 
  69         data = {'certified_experts': UserInformation.
  70                 _annotate_is_certified(UserInformation.objects.all())
  71                 .filter(_is_certified=1, user__is_active=True).count(),
  72                 'pairwise_comparisons': ExpertRating.objects.all().count(),
  73                 'videos': Video.objects.all().count(),
  74                 'min_score': min_score,
  75                 'max_score': max_score,
  76                 'total_experts': UserInformation.objects.filter(is_demo=False).count(),
  77                 'weekly_active_ratings': ExpertRating.objects.filter(
  78                         datetime_lastedit__gte=date_week_ago).count(),
  79                 'n_rated_videos': Video.objects.exclude(Q(expertrating_video_1__id=None) &
  80                                                         Q(expertrating_video_2__id=None)
  81                                                         ).distinct().count()
  82                 }
  83 
  84         return Response(StatisticsSerializerV2(data, many=False).data)
  85
  ```
  --- END FILES ---
  
  Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.
  
  Here is an example:
  
  ```diff
  diff --git a/examples/server_async.py b/examples/server_async.py
  --- a/examples/server_async.py
  +++ b/examples/server_async.py
  @@ -313,4 +313,4 @@
   
   
   if __name__ == "__main__":
  -    asyncio.run(run_async_server("."), debug=True)
  +    asyncio.run(run_async_server(), debug=True)
  diff --git a/examples/server_sync.py b/examples/server_sync.py
  --- a/examples/server_sync.py
  +++ b/examples/server_sync.py
  @@ -313,5 +313,5 @@
   
   
   if __name__ == "__main__":
  -    server = run_sync_server(".")
  +    server = run_sync_server()
       server.shutdown()
  
  ```
  
golden_diff: diff --git a/backend/backend/api_v2/statistics.py b/backend/backend/api_v2/statistics.py
  --- a/backend/backend/api_v2/statistics.py
  +++ b/backend/backend/api_v2/statistics.py
  @@ -12,24 +12,35 @@
   from django.utils.timezone import make_aware
   
   
  -class StatisticsSerializerV2(serializers.Serializer):
  -    """Serialize statistics for the website."""
  -    certified_experts = serializers.IntegerField(
  -        help_text="Number of experts with certified e-mails")
  -    total_experts = serializers.IntegerField(
  -        help_text="Number of all experts")
  -    pairwise_comparisons = serializers.IntegerField(
  -        help_text="Total number of pairwise comparisons")
  -    videos = serializers.IntegerField(
  -        help_text="Total number of videos in the database")
  -    min_score = serializers.FloatField(
  -        help_text="Minimal aggregated score over all videos and features")
  -    max_score = serializers.FloatField(
  -        help_text="Maximal aggregated score over all videos and features")
  -    weekly_active_ratings = serializers.IntegerField(
  -        help_text="Number of ratings added within a week")
  -    n_rated_videos = serializers.IntegerField(
  -        help_text="Total number of videos with ratings")
  +StatisticsSerializerV2 = type(
  +    'StatisticsSerializerV2', (serializers.Serializer,),
  +    {**dict(
  +        __doc__="""Serialize statistics for the website.""",
  +        certified_experts=serializers.IntegerField(
  +            help_text="Number of experts with certified e-mails"),
  +        total_experts=serializers.IntegerField(
  +            help_text="Number of all experts"),
  +        pairwise_comparisons=serializers.IntegerField(
  +            help_text="Total number of pairwise comparisons"),
  +        videos=serializers.IntegerField(
  +            help_text="Total number of videos in the database"),
  +        min_score=serializers.FloatField(
  +            help_text="Minimal aggregated score over all videos and features"),
  +        max_score=serializers.FloatField(
  +            help_text="Maximal aggregated score over all videos and features"),
  +        weekly_active_ratings=serializers.IntegerField(
  +            help_text="Number of ratings added within a week"),
  +        n_rated_videos=serializers.IntegerField(
  +            help_text="Total number of videos with ratings"),
  +
  +        n_sum_comparisons=serializers.IntegerField(
  +                help_text="Sum of all numbers of comparisons for all features"),
  +     ),
  +     **{f"n_{f}_comparisons": serializers.IntegerField(
  +            help_text=f"Number of comparisons for {f}")
  +        for f in VIDEO_FIELDS}
  +     }
  +)
   
   
   class StatisticsViewSetV2(viewsets.ViewSet, WithPKOverflowProtection):
  @@ -81,4 +92,13 @@
                                                           ).distinct().count()
                   }
   
  +        n_sum_comparisons = 0
  +        for f in VIDEO_FIELDS:
  +            val = ExpertRating.objects.filter(**{
  +                f + '__isnull': False, f + '_weight__gt': 0}).distinct().count()
  +            data[f"n_{f}_comparisons"] = val
  +            n_sum_comparisons += val
  +
  +        data["n_sum_comparisons"] = n_sum_comparisons
  +
           return Response(StatisticsSerializerV2(data, many=False).data)
  
verification_info: {"golden_diff": "diff --git a/backend/backend/api_v2/statistics.py b/backend/backend/api_v2/statistics.py\n--- a/backend/backend/api_v2/statistics.py\n+++ b/backend/backend/api_v2/statistics.py\n@@ -12,24 +12,35 @@\n from django.utils.timezone import make_aware\r\n \r\n \r\n-class StatisticsSerializerV2(serializers.Serializer):\r\n-    \"\"\"Serialize statistics for the website.\"\"\"\r\n-    certified_experts = serializers.IntegerField(\r\n-        help_text=\"Number of experts with certified e-mails\")\r\n-    total_experts = serializers.IntegerField(\r\n-        help_text=\"Number of all experts\")\r\n-    pairwise_comparisons = serializers.IntegerField(\r\n-        help_text=\"Total number of pairwise comparisons\")\r\n-    videos = serializers.IntegerField(\r\n-        help_text=\"Total number of videos in the database\")\r\n-    min_score = serializers.FloatField(\r\n-        help_text=\"Minimal aggregated score over all videos and features\")\r\n-    max_score = serializers.FloatField(\r\n-        help_text=\"Maximal aggregated score over all videos and features\")\r\n-    weekly_active_ratings = serializers.IntegerField(\r\n-        help_text=\"Number of ratings added within a week\")\r\n-    n_rated_videos = serializers.IntegerField(\r\n-        help_text=\"Total number of videos with ratings\")\r\n+StatisticsSerializerV2 = type(\r\n+    'StatisticsSerializerV2', (serializers.Serializer,),\r\n+    {**dict(\r\n+        __doc__=\"\"\"Serialize statistics for the website.\"\"\",\r\n+        certified_experts=serializers.IntegerField(\r\n+            help_text=\"Number of experts with certified e-mails\"),\r\n+        total_experts=serializers.IntegerField(\r\n+            help_text=\"Number of all experts\"),\r\n+        pairwise_comparisons=serializers.IntegerField(\r\n+            help_text=\"Total number of pairwise comparisons\"),\r\n+        videos=serializers.IntegerField(\r\n+            help_text=\"Total number of videos in the database\"),\r\n+        min_score=serializers.FloatField(\r\n+            help_text=\"Minimal aggregated score over all videos and features\"),\r\n+        max_score=serializers.FloatField(\r\n+            help_text=\"Maximal aggregated score over all videos and features\"),\r\n+        weekly_active_ratings=serializers.IntegerField(\r\n+            help_text=\"Number of ratings added within a week\"),\r\n+        n_rated_videos=serializers.IntegerField(\r\n+            help_text=\"Total number of videos with ratings\"),\r\n+\r\n+        n_sum_comparisons=serializers.IntegerField(\r\n+                help_text=\"Sum of all numbers of comparisons for all features\"),\r\n+     ),\r\n+     **{f\"n_{f}_comparisons\": serializers.IntegerField(\r\n+            help_text=f\"Number of comparisons for {f}\")\r\n+        for f in VIDEO_FIELDS}\r\n+     }\r\n+)\r\n \r\n \r\n class StatisticsViewSetV2(viewsets.ViewSet, WithPKOverflowProtection):\r\n@@ -81,4 +92,13 @@\n                                                         ).distinct().count()\r\n                 }\r\n \r\n+        n_sum_comparisons = 0\r\n+        for f in VIDEO_FIELDS:\r\n+            val = ExpertRating.objects.filter(**{\r\n+                f + '__isnull': False, f + '_weight__gt': 0}).distinct().count()\r\n+            data[f\"n_{f}_comparisons\"] = val\r\n+            n_sum_comparisons += val\r\n+\r\n+        data[\"n_sum_comparisons\"] = n_sum_comparisons\r\n+\r\n         return Response(StatisticsSerializerV2(data, many=False).data)\n", "issue": "Count ratings appropriately\nIf a contributor rates A versus B on 9 quality criteria, this should count as 9 ratings.\r\nThe home page statistics should reflect this, on not the number of times a contributor rated A versus B :)\n", "before_files": [{"content": "from backend.models import ExpertRating, Video, UserInformation\r\nfrom drf_spectacular.utils import extend_schema\r\nfrom rest_framework import serializers\r\nfrom rest_framework import viewsets\r\nfrom rest_framework.decorators import action\r\nfrom rest_framework.permissions import IsAuthenticatedOrReadOnly\r\nfrom rest_framework.response import Response\r\nfrom backend.rating_fields import VIDEO_FIELDS\r\nfrom django.db.models import Min, Max, F, Q\r\nfrom backend.api_v2.helpers import WithPKOverflowProtection\r\nimport datetime\r\nfrom django.utils.timezone import make_aware\r\n\r\n\r\nclass StatisticsSerializerV2(serializers.Serializer):\r\n    \"\"\"Serialize statistics for the website.\"\"\"\r\n    certified_experts = serializers.IntegerField(\r\n        help_text=\"Number of experts with certified e-mails\")\r\n    total_experts = serializers.IntegerField(\r\n        help_text=\"Number of all experts\")\r\n    pairwise_comparisons = serializers.IntegerField(\r\n        help_text=\"Total number of pairwise comparisons\")\r\n    videos = serializers.IntegerField(\r\n        help_text=\"Total number of videos in the database\")\r\n    min_score = serializers.FloatField(\r\n        help_text=\"Minimal aggregated score over all videos and features\")\r\n    max_score = serializers.FloatField(\r\n        help_text=\"Maximal aggregated score over all videos and features\")\r\n    weekly_active_ratings = serializers.IntegerField(\r\n        help_text=\"Number of ratings added within a week\")\r\n    n_rated_videos = serializers.IntegerField(\r\n        help_text=\"Total number of videos with ratings\")\r\n\r\n\r\nclass StatisticsViewSetV2(viewsets.ViewSet, WithPKOverflowProtection):\r\n    \"\"\"Show website statistics.\"\"\"\r\n    serializer_class = StatisticsSerializerV2\r\n    permission_classes = [IsAuthenticatedOrReadOnly]\r\n\r\n    # need a list, otherwise router will not register this viewset\r\n    @extend_schema(exclude=True, responses={\r\n                200: StatisticsSerializerV2(\r\n                    many=True),\r\n                400: None})\r\n    def list(self, request):\r\n        return Response({})\r\n\r\n    @extend_schema(\r\n        responses={\r\n            200: StatisticsSerializerV2(\r\n                many=False)},\r\n        operation_id=\"view\")\r\n    @action(methods=['GET'], detail=False)\r\n    def view(self, request):\r\n        \"\"\"Get statistics for the website.\"\"\"\r\n        minmax_scores = \\\r\n            Video.objects.aggregate(**{'max_' + f: Max(F(f)) for f in VIDEO_FIELDS},\r\n                                    **{'min_' + f: Min(F(f)) for f in VIDEO_FIELDS})\r\n\r\n        try:\r\n            min_score = min([v for k, v in minmax_scores.items() if k.startswith('min')])\r\n            max_score = max([v for k, v in minmax_scores.items() if k.startswith('max')])\r\n        except Exception:\r\n            min_score = 0.0\r\n            max_score = 0.0\r\n\r\n        date_week_ago = make_aware(datetime.datetime.now()) - datetime.timedelta(days=7)\r\n\r\n        data = {'certified_experts': UserInformation.\r\n                _annotate_is_certified(UserInformation.objects.all())\r\n                .filter(_is_certified=1, user__is_active=True).count(),\r\n                'pairwise_comparisons': ExpertRating.objects.all().count(),\r\n                'videos': Video.objects.all().count(),\r\n                'min_score': min_score,\r\n                'max_score': max_score,\r\n                'total_experts': UserInformation.objects.filter(is_demo=False).count(),\r\n                'weekly_active_ratings': ExpertRating.objects.filter(\r\n                        datetime_lastedit__gte=date_week_ago).count(),\r\n                'n_rated_videos': Video.objects.exclude(Q(expertrating_video_1__id=None) &\r\n                                                        Q(expertrating_video_2__id=None)\r\n                                                        ).distinct().count()\r\n                }\r\n\r\n        return Response(StatisticsSerializerV2(data, many=False).data)\r\n", "path": "backend/backend/api_v2/statistics.py"}], "after_files": [{"content": "from backend.models import ExpertRating, Video, UserInformation\r\nfrom drf_spectacular.utils import extend_schema\r\nfrom rest_framework import serializers\r\nfrom rest_framework import viewsets\r\nfrom rest_framework.decorators import action\r\nfrom rest_framework.permissions import IsAuthenticatedOrReadOnly\r\nfrom rest_framework.response import Response\r\nfrom backend.rating_fields import VIDEO_FIELDS\r\nfrom django.db.models import Min, Max, F, Q\r\nfrom backend.api_v2.helpers import WithPKOverflowProtection\r\nimport datetime\r\nfrom django.utils.timezone import make_aware\r\n\r\n\r\nStatisticsSerializerV2 = type(\r\n    'StatisticsSerializerV2', (serializers.Serializer,),\r\n    {**dict(\r\n        __doc__=\"\"\"Serialize statistics for the website.\"\"\",\r\n        certified_experts=serializers.IntegerField(\r\n            help_text=\"Number of experts with certified e-mails\"),\r\n        total_experts=serializers.IntegerField(\r\n            help_text=\"Number of all experts\"),\r\n        pairwise_comparisons=serializers.IntegerField(\r\n            help_text=\"Total number of pairwise comparisons\"),\r\n        videos=serializers.IntegerField(\r\n            help_text=\"Total number of videos in the database\"),\r\n        min_score=serializers.FloatField(\r\n            help_text=\"Minimal aggregated score over all videos and features\"),\r\n        max_score=serializers.FloatField(\r\n            help_text=\"Maximal aggregated score over all videos and features\"),\r\n        weekly_active_ratings=serializers.IntegerField(\r\n            help_text=\"Number of ratings added within a week\"),\r\n        n_rated_videos=serializers.IntegerField(\r\n            help_text=\"Total number of videos with ratings\"),\r\n\r\n        n_sum_comparisons=serializers.IntegerField(\r\n                help_text=\"Sum of all numbers of comparisons for all features\"),\r\n     ),\r\n     **{f\"n_{f}_comparisons\": serializers.IntegerField(\r\n            help_text=f\"Number of comparisons for {f}\")\r\n        for f in VIDEO_FIELDS}\r\n     }\r\n)\r\n\r\n\r\nclass StatisticsViewSetV2(viewsets.ViewSet, WithPKOverflowProtection):\r\n    \"\"\"Show website statistics.\"\"\"\r\n    serializer_class = StatisticsSerializerV2\r\n    permission_classes = [IsAuthenticatedOrReadOnly]\r\n\r\n    # need a list, otherwise router will not register this viewset\r\n    @extend_schema(exclude=True, responses={\r\n                200: StatisticsSerializerV2(\r\n                    many=True),\r\n                400: None})\r\n    def list(self, request):\r\n        return Response({})\r\n\r\n    @extend_schema(\r\n        responses={\r\n            200: StatisticsSerializerV2(\r\n                many=False)},\r\n        operation_id=\"view\")\r\n    @action(methods=['GET'], detail=False)\r\n    def view(self, request):\r\n        \"\"\"Get statistics for the website.\"\"\"\r\n        minmax_scores = \\\r\n            Video.objects.aggregate(**{'max_' + f: Max(F(f)) for f in VIDEO_FIELDS},\r\n                                    **{'min_' + f: Min(F(f)) for f in VIDEO_FIELDS})\r\n\r\n        try:\r\n            min_score = min([v for k, v in minmax_scores.items() if k.startswith('min')])\r\n            max_score = max([v for k, v in minmax_scores.items() if k.startswith('max')])\r\n        except Exception:\r\n            min_score = 0.0\r\n            max_score = 0.0\r\n\r\n        date_week_ago = make_aware(datetime.datetime.now()) - datetime.timedelta(days=7)\r\n\r\n        data = {'certified_experts': UserInformation.\r\n                _annotate_is_certified(UserInformation.objects.all())\r\n                .filter(_is_certified=1, user__is_active=True).count(),\r\n                'pairwise_comparisons': ExpertRating.objects.all().count(),\r\n                'videos': Video.objects.all().count(),\r\n                'min_score': min_score,\r\n                'max_score': max_score,\r\n                'total_experts': UserInformation.objects.filter(is_demo=False).count(),\r\n                'weekly_active_ratings': ExpertRating.objects.filter(\r\n                        datetime_lastedit__gte=date_week_ago).count(),\r\n                'n_rated_videos': Video.objects.exclude(Q(expertrating_video_1__id=None) &\r\n                                                        Q(expertrating_video_2__id=None)\r\n                                                        ).distinct().count()\r\n                }\r\n\r\n        n_sum_comparisons = 0\r\n        for f in VIDEO_FIELDS:\r\n            val = ExpertRating.objects.filter(**{\r\n                f + '__isnull': False, f + '_weight__gt': 0}).distinct().count()\r\n            data[f\"n_{f}_comparisons\"] = val\r\n            n_sum_comparisons += val\r\n\r\n        data[\"n_sum_comparisons\"] = n_sum_comparisons\r\n\r\n        return Response(StatisticsSerializerV2(data, many=False).data)\r\n", "path": "backend/backend/api_v2/statistics.py"}]}