change user_name still used as login and add display_name for dashboard view instead of username on login

backend/apps/accounts/views.py

@@ -57,7 +57,7 @@ class UserViewSet(viewsets.ModelViewSet):
 
     def get_queryset(self):
         qs = User.objects.select_related("managed_by", "managed_by_pending").order_by(
-            "user_name"
+            "display_name"
         )
         return filter_users_queryset(qs, self.request.user)
 
@@ -103,7 +103,7 @@ class UserViewSet(viewsets.ModelViewSet):
         rows = User.objects.filter(
             status=User.STATUS_BUH,
             is_active=True,
-        ).order_by("user_name")
+        ).order_by("display_name")
         return Response(UserSerializer(rows, many=True).data)
 
     @action(detail=False, methods=["get"], url_path="pending-managed")
@@ -114,7 +114,7 @@ class UserViewSet(viewsets.ModelViewSet):
         rows = User.objects.filter(
             managed_by_pending=request.user,
             status=User.STATUS_GM,
-        ).select_related("managed_by", "managed_by_pending").order_by("user_name")
+        ).select_related("managed_by", "managed_by_pending").order_by("display_name")
         return Response(UserSerializer(rows, many=True).data)
 
     @action(detail=False, methods=["post"], url_path="request-managed-by")
@@ -235,7 +235,7 @@ class LoginView(APIView):
         serializer.is_valid(raise_exception=True)
         user = authenticate(
             request,
-            username=serializer.validated_data["user_login"],
+            username=serializer.validated_data["user_name"],
             password=serializer.validated_data["password"],
         )
         if user is None: