Django之form重写save()方法

class UserInfo(models.Model):
username = models.CharField("用户名", max_length=64, unique=True)
password = models.CharField("密码", max_length=64)
uid = models.CharField(verbose_name='个人唯一ID', max_length=64, unique=True)

wx_id = models.CharField(verbose_name="微信ID", max_length=128, blank=True, null=True, db_index=True)

def save(self, *args, **kwargs):
# 创建用户时，为用户自动生成个人唯一ID
if not self.pk:
# 存在就更新，不存在就创建
m = hashlib.md5()
m.update(self.username.encode(encoding="utf-8"))
self.uid = m.hexdigest()
super(UserInfo, self).save(*args, **kwargs)