用户地址管理

我们为保存用户的地址信息，创建数据库表，在users/models.py中定义模型类

class Address(BaseModel):
    """
    用户地址
    """
    user = models.ForeignKey(User, on_delete=models.CASCADE, related_name='addresses', verbose_name='用户')
    title = models.CharField(max_length=20, verbose_name='地址名称')
    receiver = models.CharField(max_length=20, verbose_name='收货人')
    province = models.ForeignKey('areas.Area', on_delete=models.PROTECT, related_name='province_addresses', verbose_name='省')
    city = models.ForeignKey('areas.Area', on_delete=models.PROTECT, related_name='city_addresses', verbose_name='市')
    district = models.ForeignKey('areas.Area', on_delete=models.PROTECT, related_name='district_addresses', verbose_name='区')
    place = models.CharField(max_length=50, verbose_name='地址')
    mobile = models.CharField(max_length=11, verbose_name='手机')
    tel = models.CharField(max_length=20, null=True, blank=True, default='', verbose_name='固定电话')
    email = models.CharField(max_length=30, null=True, blank=True, default='', verbose_name='电子邮箱')
    is_deleted = models.BooleanField(default=False, verbose_name='逻辑删除')

    class Meta:
        db_table = 'tb_address'
        verbose_name = '用户地址'
        verbose_name_plural = verbose_name
        ordering = ['-update_time']

说明：

• Address模型类中的外键指向Areas/models里面的Area，指明外键ForeignKey时，可以使用字符串应用名.模型类名来定义

• related_name 在进行反向关联查询时使用的属性，如 city = models.ForeignKey('areas.Area', related_name='city_addresses')表示可以通过Area对象.city_addresses属性获取所有相关的city数据。

• ordering 表名在进行Address查询时，默认使用的排序方式

为User模型类添加默认地址

class User(AbstractUser):
    ...
    default_address = models.ForeignKey('Address', related_name='users', null=True, blank=True, on_delete=models.SET_NULL, verbose_name='默认地址')
    ...