獲取所有Django的級聯的AUTH_USER

Question

我想獲得的是取決於所有的Django模型（有外鍵）在一個特定的auth_user（用戶模式）

的相關模型這樣做的SQL版本看起來something like this除了將實例不是我想要的遞歸。

理想情況下，我想刪除任何相關數據到特定的User而不銷燬該用戶，例如觸發級聯刪除但跳過刪除根對象，在本例中爲用戶。

Answer 1

您可以定義所有ForeignKeys或M2M鍵，用戶模型的related_name，像這樣：

# you models.py 
class SomeModel(models.Model): 
    name = models.CharField(...) 
    user = models.ForeignKey(related_name='userrelated__somemodel') 

# views.py 
# you can get all dependence names of user model attributes 
all_user_attrs = dir(request.user) 
# ['userrelated__somemodel1', 'userrelated__somemodel2', ...] 
# and here you can get all names only related fields 
related_fields = filter(lambda x: 'userrelated__' in x, all_user_attrs) 
# and if you want to get this field, you can do this: 
for attr_name in related_fields: 
    attr = getattr(request.user, attr_name, None) 
    print attr