fix: optimize queryset in CourseListAPIView with select_related and improved filtering

apps/course/views/course.py

@@ -33,15 +33,6 @@ class CourseListAPIView(ListAPIView):
     filter_backends = [SearchFilter]
     search_fields = ['title', 'category__name', 'professor__fullname']
 
-    def get_queryset(self):
-        """
-        Optimized queryset with select_related for ForeignKey relationships
-        """
-        return Course.objects.select_related(
-            'category',
-            'professor'
-        ).exclude(status=Course.StatusChoices.INACTIVE)
-
     @swagger_auto_schema(
     operation_description=doc_course_list(),
     manual_parameters=[
@@ -59,7 +50,7 @@ class CourseListAPIView(ListAPIView):
         openapi.Parameter(
             'status', openapi.IN_QUERY,
             type=openapi.TYPE_STRING,
-            description="""Status => 
+            description="""Status =>
             Upcoming (visible but registration not allowed)---Предстоящие
             Registering (registration is open)---регистрация
             Ongoing (course has started, registration closed)---Впроцессе
@@ -79,13 +70,20 @@ class CourseListAPIView(ListAPIView):
         ),
     ])
     def get(self, request, *args, **kwargs):
-        return super().get(request, *args, **kwargs)        
-        
+        return super().get(request, *args, **kwargs)
+
     def get_queryset(self):
-        queryset = super().get_queryset()
+        """
+        Optimized queryset with select_related for ForeignKey relationships and filtering
+        """
+        queryset = Course.objects.select_related(
+            'category',
+            'professor'
+        ).exclude(status=Course.StatusChoices.INACTIVE)
+
         request = self.request
         filters = request.query_params
-            
+
         # Handle category_slug with multiple values separated by commas
         if category_slugs := filters.get('category_slug'):
             category_slugs_list = category_slugs.split(',')
@@ -95,7 +93,7 @@ class CourseListAPIView(ListAPIView):
         if statuses := filters.get('status'):
             statuses_list = statuses.split(',')
             queryset = queryset.filter(status__in=statuses_list)
-        
+
         if is_free := filters.get('is_free'):
             is_free = is_free.lower() == 'true'
             queryset = queryset.filter(
@@ -104,7 +102,7 @@ class CourseListAPIView(ListAPIView):
         if is_online := filters.get('is_online'):
             is_online = is_online.lower() == 'true'
             queryset = queryset.filter(is_online=is_online)
-            
+
         return queryset