常见signal类型

• pre_save 对象save前触发

  
  

• post_save 对象save后触发

  
  

• pre_delete 对象delete前触发

  
  

• post_delete 对象delete后触发

  
  

• m2m_changed ManyToManyField 字段更新后触发

  
  

用户注册案例的使用

signals.py

from django.contrib.auth import get_user_model

from django.db.models.signals import post_save

from django.dispatch import receiver



User = get_user_model()





@receiver(post_save, sender=User)

def create_user_profile(sender, instance = None, created = False, **kwargs):

    if created:

        password = instance.password

        instance.set_password(password)

        # User.objects.create(user=instance)

        instance.save()

apps.py

from django.apps import AppConfig





class UsersConfig(AppConfig):

    default_auto_field = 'django.db.models.BigAutoField'

    name = 'apps.users'

    verbose_name = '用户管理'



    # 注册信号

    def ready(self):

        import apps.users.signals

备注

在用户注册之前,加密了 password, 相当于重写create方法