在管理员中完成操作时，django信号启动两次

Question

我删除对象后启动的简单信号

@receiver(post_delete, sender=Operation, dispatch_uid="delete_operation")
def delete_operation(sender, instance, **kwargs):
    # Track balance operations for delete
    instance.user.balance = instance.user.balance - int(instance.amount) # Note the "-"
    instance.user.save()

问题在于，当我将对象删除到管理员中时，信号会启动两次并失去我的余额。我想避免2次触发。我在stackoverflow上搜索并尝试了几种解决方案，但仍无法正常工作。

以下是我导入信号的方法：

apps.py

class CommonConfig(AppConfig):
name = 'sl.common'

def ready(self):
    import sl.common.signals

如果有人有想法，欢迎!!

Answer 1

@receiver(post_delete, sender=Operation, dispatch_uid="delete_operation")
def delete_operation(sender, instance, action, **kwargs):
    if action[0:4] == 'post':
        # Track balance operations for delete
        instance.user.balance = instance.user.balance - int(instance.amount) # Note the "-"
        instance.user.save()

每个信号都有两个动作：前置和后置 - 前置实例在更改前有字段，后置实例在更改后有字段。

• pre_add和post_add
• pre_remove和post_remove