update admin panels quiz and courses

apps/course/serializers/admin.py

@@ -538,10 +538,11 @@ class AdminLiveSessionRecordingSerializer(serializers.ModelSerializer):
 class AdminLiveSessionListSerializer(serializers.ModelSerializer):
     course_title = serializers.SerializerMethodField()
     participant_count = serializers.SerializerMethodField()
+    media_count = serializers.IntegerField(read_only=True)
 
     class Meta:
         model = CourseLiveSession
-        fields = ['id', 'course', 'course_title', 'room_id', 'subject', 'started_at', 'ended_at', 'participant_count', 'created_at']
+        fields = ['id', 'course', 'course_title', 'room_id', 'subject', 'started_at', 'ended_at', 'participant_count', 'media_count', 'created_at']
 
     def get_course_title(self, obj):
         if not obj.course:

apps/course/views/admin.py

@@ -1,7 +1,7 @@
 import logging
 
 from django.db import transaction
-from django.db.models import Q
+from django.db.models import Count, Q
 from django.utils import timezone
 from rest_framework import serializers, viewsets
 from rest_framework.permissions import IsAuthenticated
@@ -541,7 +541,9 @@ class AdminLiveSessionViewSet(viewsets.ModelViewSet):
         return AdminLiveSessionDetailSerializer
 
     def get_queryset(self):
-        queryset = CourseLiveSession.objects.all().select_related('course')
+        queryset = CourseLiveSession.objects.all().select_related('course').annotate(
+            media_count=Count('recordings', distinct=True)
+        )
 
         # Professors can only see live sessions of their own courses
         if is_professor(self.request):

apps/quiz/serializers/admin.py

@@ -118,7 +118,7 @@ class AdminQuizDetailSerializer(serializers.ModelSerializer):
             'questions_count', 
             'participants_count'
         ]
-        read_only_fields = ['course', 'course_title', 'lesson_title', 'questions_count', 'participants_count']
+        read_only_fields = ['course_title', 'lesson_title', 'questions_count', 'participants_count']
 
     def get_questions_count(self, obj):
         return obj.questions.count()