fix soft-delete-manager

apps/core/manager.py

@@ -3,6 +3,7 @@ from django.db import models
 
 class SoftDeleteManager(models.Manager):
     """ manager for get all records with trash=False in whole project """
+
     def get_queryset(self):
         return super().get_queryset().filter(trash=False)
 
@@ -10,3 +11,5 @@ class SoftDeleteManager(models.Manager):
         """ get all records, also deleted ones """
         return super().get_queryset().all()
 
+    def get_by_natural_key(self, username):
+        return self.get_queryset().get(username=username)