Django——User-Profile

Profile作用：User内置的字段不够完善，导致创建的用户信息单一，Profile就是为了对User进行扩展，即丰富用户信息

在models中创建Profile类，添加字段user与User形成OneToOne关系以及级联删除
```
on_delete=models.CASCADE
```

引入与信号相关的包

from django.dispatch import receiver
from django.db.models.signals import post_save

装饰器装饰函数，User创建时信号触发自动创建Profile的user字段并关联；User保存时信号触发，Profile自动保存

源码

 1 from django.db import models
 2 from django.contrib.auth.models import User
 3 #信号
 4 from django.db.models.signals import post_save,post_init
 5 from django.dispatch import receiver
 6 
 7 class Profile(models.Model):
 8     user = models.OneToOneField(User,on_delete=models.CASCADE)
 9     birth = models.DateField(null=True,blank=True)
10 
11     def __str__(self):
12         return self.user.username
13 
14     class Meta:
15         db_table = 'profile'
16 
17 
18 @receiver(post_save,sender=User)
19 def create_user_profile(sender,instance,created,**kwargs):
20     print('创建User')
21     if created:
22         Profile.objects.create(user=instance)
23 
24 @receiver(post_save,sender=User)
25 def save_user_profile(sender,instance,**kwargs):
26     print('保存User')
27     instance.profile.save()