django信号量

django进行增删时候都会发出一个信号量

#在apps.py中添加 def ready(self)的方法
class UserOperationConfig(AppConfig):
    name = 'user_operation'
    verbose_name = "用户操作管理"

    def ready(self):
        import user_operation.signals

#新建signals.py

from django.db.models.signals import post_save, post_delete
from django.dispatch import receiver
from rest_framework.authtoken.models import Token
from django.contrib.auth import get_user_model


from user_operation.models import UserFav


@receiver(post_save, sender=UserFav)
def create_userfav(sender, instance=None, created=False, **kwargs):
    if created:
        goods = instance.goods
        goods.fav_num += 1
        goods.save()


@receiver(post_delete, sender=UserFav)
def delete_userfav(sender, instance=None, created=False, **kwargs):
    goods = instance.goods
    goods.fav_num -= 1
    goods.save()

 

或者在view.py viewsets类中重新加载，不利用前后端分离的规范性

# def perform_create(self, serializer):
    #     instance = serializer.save()
    #     goods = instance.goods
    #     goods.fav_num += 1
    #     goods.save()

 

来源：https://www.cnblogs.com/luguochang/p/12258504.html