Django import models.py FK錯誤

我在notifications應用中有一個模型。Django import models.py FK錯誤

class Notification(models.Model): 
    name = models.CharField(max_length = 255, primary_key = True) 
    description = models.CharField(max_length = 255)

而在Server的另一個模型應用程序。

from modules.notifications.models import * # importing notification's model 

class Server(models.Model): 
    url = models.CharField(max_length = 255, unique = True) 

    @staticmethod 
    def get_as_dict(server): 
     server_notification_mapping_obj = ServerNotificationMapping.objects.filter(server = server) 
     notifications_list = [obj.notification.name for obj in server_notification_mapping_obj] 

     return { 
        'id':server.id, 
        'url':server.url, 
        'notifications':notifications_list 
       } 




class ServerNotificationMapping(models.Model): 
    server = models.ForeignKey('Server', related_name = 'servers') 
    notification = models.ForeignKey('Notification',related_name = 'notifications') 
    class Meta: 
     unique_together = (("server", "notification"),)

即使我從通知應用程序導入模型，我仍然得到一個錯誤說

Unhandled exception in thread started by <function wrapper at 0x7fb523bad0c8> 
Traceback (most recent call last): 
    File "/usr/lib/python2.7/dist-packages/django/utils/autoreload.py", line 93, in wrapper 
    fn(*args, **kwargs) 
    File "/usr/lib/python2.7/dist-packages/django/core/management/commands/runserver.py", line 101, in inner_run 
    self.validate(display_num_errors=True) 
    File "/usr/lib/python2.7/dist-packages/django/core/management/base.py", line 314, in validate 
    raise CommandError("One or more models did not validate:\n%s" % error_text) 
django.core.management.base.CommandError: One or more models did not validate: 
servers.servernotificationmapping: 'notification' has a relation with model Notification, which has either not been installed or is abstract.

來源

2014-10-08 PythonEnthusiast

嘗試（使用實際的類名，而不是一個字符串）：

class ServerNotificationMapping(models.Model): 
    server = models.ForeignKey('Server', related_name = 'servers') 
    notification = models.ForeignKey(Notification,related_name = 'notifications') 
    class Meta: 
     unique_together = (("server", "notification"),)

來源

2014-10-08 04:54:46

謝謝......它的工作....但1個問題。它會影響關係嗎？另外，我還有其他的FK關係，我在''''裏面提供了類名，所以我應該刪除它們嗎？最佳做法是什麼？ – PythonEnthusiast 2014-10-08 05:09:34

此外，它是否建議有不同的應用程序具體models.py文件或所有模型應該合併在一個應用程序。在不同應用程序中使用不同模型的缺點是我必須以不同方式「架構移植」和「移植」不同的應用程序。那麼，推薦哪一個？ – PythonEnthusiast 2014-10-08 05:24:25

約定是使用實際的類而不是類名字符串。所以是的，最好爲其他FK關係做同樣的事情。它不影響關係，但它可能與django如何回顧課程有關。 – 2014-10-08 21:07:55

Django import models.py FK錯誤

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