Fix kms_provider condition to check fields

Author: aclark4life

django_mongodb_backend/routers.py

@@ -2,6 +2,8 @@
 from django.core.exceptions import ImproperlyConfigured
 from django.db.utils import ConnectionRouter
 
+from .fields import has_encrypted_fields
+
 
 class MongoRouter:
     def allow_migrate(self, db, app_label, model_name=None, **hints):
@@ -28,7 +30,7 @@ def kms_provider(self, model, *args, **kwargs):
             result = func(model, *args, **kwargs)
             if result is not None:
                 return result
-    if getattr(model, "encrypted", False):
+    if has_encrypted_fields(model):
         raise ImproperlyConfigured("No kms_provider found in database router.")
     return None