[Update] 优化User操作private_token的接口 (#3091)

* [Update] 优化User操作private_token的接口

* [Update] 优化User操作private_token的接口 2

apps/users/models/user.py

@@ -207,20 +207,19 @@ class TokenMixin:
 
     @property
     def private_token(self):
-        from authentication.models import PrivateToken
-        try:
-            token = PrivateToken.objects.get(user=self)
-        except PrivateToken.DoesNotExist:
-            token = self.create_private_token()
-        return token
+        return self.create_private_token()
 
     def create_private_token(self):
         from authentication.models import PrivateToken
-        token = PrivateToken.objects.create(user=self)
+        token, created = PrivateToken.objects.get_or_create(user=self)
         return token
 
+    def delete_private_token(self):
+        from authentication.models import PrivateToken
+        PrivateToken.objects.filter(user=self).delete()
+
     def refresh_private_token(self):
-        self.private_token.delete()
+        self.delete_private_token()
         return self.create_private_token()
 
     def create_bearer_token(self, request=None):