[feat] users by event

backend/project/api/users/views.py

@@ -18,6 +18,22 @@ class UserViewSet(ModelViewSet):
     serializer_class = UserSerializer
 
 
+class UsersByEvent(APIView):
+    def get(self, _, event_id):
+        try:
+            event = Event.objects.get(pk=event_id)
+        except Event.DoesNotExist:
+            return Response(
+                {"error": "Event does not exist"},
+                status=status.HTTP_404_NOT_FOUND,
+            )
+
+        users = event.users.all()
+        serializer = UserSerializer(users, many=True)
+
+        return Response(serializer.data)
+
+
 class RegisterUsersFromExcelView(APIView):
     def post(self, request, event_id):
         try: