query optimization for corrections and interpretation

apps/hadis/serializers/serializers_admin.py

@@ -230,10 +230,23 @@ class AdminHadisDetailSerializer(serializers.ModelSerializer):
         return hadis
 
 
-class AdminHadisCorrectionSerializer(serializers.ModelSerializer):
-    hadis_detail = AdminHadisListSerializer(source="hadis", read_only=True)
+class AdminHadisBriefSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = Hadis
+        fields = ["id", "number", "title"]
 
-    bookmark_count = serializers.SerializerMethodField()
+
+class AdminHadisCategoryBriefSerializer(serializers.ModelSerializer):
+    title = LocalizedField()
+
+    class Meta:
+        model = HadisCategory
+        fields = ["id", "title"]
+
+
+class AdminHadisCorrectionSerializer(serializers.ModelSerializer):
+    hadis_detail = AdminHadisBriefSerializer(source="hadis", read_only=True)
+    bookmark_count = serializers.IntegerField(source="annotated_bookmark_count", read_only=True)
 
     class Meta:
         model = HadisCorrection
@@ -252,13 +265,9 @@ class AdminHadisCorrectionSerializer(serializers.ModelSerializer):
         ]
         read_only_fields = ["id", "slug", "bookmark_count", "created_at", "updated_at"]
 
-    def get_bookmark_count(self, obj):
-        from apps.bookmark.models.bookmark import Bookmark
-        return Bookmark.objects.filter(service=Bookmark.ServiceChoices.HADITH_CORRECTION, content_id=obj.id, status=True).count()
-
 
 class AdminHadisInterpretationSerializer(serializers.ModelSerializer):
-    category_detail = AdminHadisCategorySerializer(source="category", read_only=True)
+    category_detail = AdminHadisCategoryBriefSerializer(source="category", read_only=True)
 
     class Meta:
         model = HadisInterpretation

apps/hadis/views_admin.py

@@ -319,7 +319,19 @@ class AdminHadisCorrectionViewSet(ModelViewSet):
     pagination_class = None
 
     def get_queryset(self):
-        queryset = HadisCorrection.objects.all()
+        from django.db.models import Count, OuterRef, Subquery, IntegerField
+        from django.db.models.functions import Coalesce
+        from apps.bookmark.models.bookmark import Bookmark
+
+        bookmarks_subquery = Bookmark.objects.filter(
+            service=Bookmark.ServiceChoices.HADITH_CORRECTION,
+            content_id=OuterRef("id"),
+            status=True
+        ).values("content_id").annotate(count=Count("id")).values("count")
+
+        queryset = HadisCorrection.objects.all().select_related("hadis").annotate(
+            annotated_bookmark_count=Coalesce(Subquery(bookmarks_subquery, output_field=IntegerField()), 0)
+        )
         hadis_id = self.request.query_params.get("hadis_id")
         if hadis_id:
             queryset = queryset.filter(hadis_id=hadis_id)
@@ -353,7 +365,7 @@ class AdminHadisInterpretationViewSet(ModelViewSet):
     pagination_class = None
 
     def get_queryset(self):
-        queryset = HadisInterpretation.objects.all()
+        queryset = HadisInterpretation.objects.all().select_related("category")
         category_id = self.request.query_params.get("category_id")
         if category_id:
             queryset = queryset.filter(category_id=category_id)