本文整理匯總了Python中django.db.models.deletion.SET_NULL屬性的典型用法代碼示例。如果您正苦於以下問題：Python deletion.SET_NULL屬性的具體用法？Python deletion.SET_NULL怎麽用？Python deletion.SET_NULL使用的例子？那麽, 這裏精選的屬性代碼示例或許可以為您提供幫助。您也可以進一步了解該屬性所在類django.db.models.deletion的用法示例。
在下文中一共展示了deletion.SET_NULL屬性的2個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的Python代碼示例。
示例1: _check_on_delete
# 需要導入模塊: from django.db.models import deletion [as 別名]
# 或者: from django.db.models.deletion import SET_NULL [as 別名]
def _check_on_delete(self):
on_delete = getattr(self.rel, 'on_delete', None)
if on_delete == SET_NULL and not self.null:
return [
checks.Error(
'Field specifies on_delete=SET_NULL, but cannot be null.',
hint='Set null=True argument on the field, or change the on_delete rule.',
obj=self,
id='fields.E320',
)
]
elif on_delete == SET_DEFAULT and not self.has_default():
return [
checks.Error(
'Field specifies on_delete=SET_DEFAULT, but has no default value.',
hint='Set a default value, or change the on_delete rule.',
obj=self,
id='fields.E321',
)
]
else:
return [] 示例2: _check_on_delete
# 需要導入模塊: from django.db.models import deletion [as 別名]
# 或者: from django.db.models.deletion import SET_NULL [as 別名]
def _check_on_delete(self):
on_delete = getattr(self.remote_field, 'on_delete', None)
if on_delete == SET_NULL and not self.null:
return [
checks.Error(
'Field specifies on_delete=SET_NULL, but cannot be null.',
hint='Set null=True argument on the field, or change the on_delete rule.',
obj=self,
id='fields.E320',
)
]
elif on_delete == SET_DEFAULT and not self.has_default():
return [
checks.Error(
'Field specifies on_delete=SET_DEFAULT, but has no default value.',
hint='Set a default value, or change the on_delete rule.',
obj=self,
id='fields.E321',
)
]
else:
return []