Django 信号 post_save 未创建返回两次

Question

当我尝试在信号中更新帖子时，会发生此错误：

from django.db.models.signals import post_save

@receiver(post_save, sender=Post)
def post_save_receiver(sender, instance, created, *args, **kwargs):

  if created:
    print(instance.author, " Created")

  else:
    print(instance.author, " was just saved")

输出：

root was just saved

root was just saved

这是我更新帖子的时候。它运行了两次。为什么？

Answer 1

我不是 100% 确定您的案例，但您应该创建它，而不是打印。

@receiver(post_save, sender=User)
def create_profile(sender, instance, created, **kwargs):
    if created:
        Profile.objects.create(user=instance)


@receiver(post_save, sender=User)
def save_profile(sender, instance,  **kwargs):
    try:
        instance.profile.save()
    except ObjectDoesNotExist:
        Profile.objects.create(user=instance)