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

backend/apps/farms/serializers.py

@@ -5,7 +5,7 @@ from apps.farms.models import Cycle, Flock, Kandang, Site
 
 
 class SiteSerializer(PkAsIdMixin, serializers.ModelSerializer):
-    owner_name = serializers.CharField(source="user.user_name", read_only=True)
+    owner_name = serializers.CharField(source="user.display_name", read_only=True)
 
     class Meta:
         model = Site