django-改写manage类-objects

class AddressManage(models.Manager):
    ‘‘‘地址模型管理类‘‘‘
    def get_default_addr(self, user):
        ‘‘‘获取默认收货地址‘‘‘
        try:
            address = self.get(user=user, is_default=True)
        except self.model.DoesNotExist:
            # 不存在默认收货地址
            address = None
        return address


class Address(BaseModel):
    ‘‘‘地址模型类‘‘‘
    user = models.ForeignKey(‘User‘, verbose_name=‘所属账户‘, on_delete=models.CASCADE,)
    receiver = models.CharField(max_length=20, verbose_name=‘收件人‘)
    addr = models.CharField(max_length=256, verbose_name=‘收件地址‘)
    zip_code = models.CharField(max_length=6, null=True, verbose_name=‘邮政编码‘)
    phone = models.CharField(max_length=11, verbose_name=‘联系电话‘)
    is_default = models.BooleanField(default=False, verbose_name=‘是否默认‘)
    # 自定义一个模型管理器对象
    objects = AddressManage()

    class Meta:
        db_table = ‘df_address‘
        verbose_name = ‘地址‘
        verbose_name_plural = verbose_name

# 用户地址
# /user/address
from user.models import Address
class AddressView(LoginRequiredMinxin, View):
    def get(self, request):
        ‘‘‘显示用户信息页面‘‘‘
        # 获取地址信息
        user = request.user
        address = Address.objects.get_default_addr(user)
        print(address)
        return render(request, ‘user_center_site.html‘, {‘page‘:‘address‘, ‘address‘:address})

    def post(self, request):
        ‘‘‘添加地址‘‘‘
        # 接收数据
        receiver = request.POST.get(‘receiver‘)
        zip_code = request.POST.get(‘zip_code‘)
        addr = request.POST.get(‘addr‘)
        phone = request.POST.get(‘phone‘)
        # 校验数据
        if not all([receiver, addr, phone]):
            return render(request, ‘user_center_site.html‘, {‘errmsg‘:‘数据不完整‘})
        if not re.match(r‘^1[3|4|5|7|8][0-9]{9}$‘, phone):
            return render(request, ‘user_center_site.html‘, {‘errmsg‘:‘手机格式不正确‘})
        # 业务处理：地址添加
        # 如果用户已存在默认收货地址，添加的地址不作为默认收货地址，否则作为默认收货地址
        # 获取登录用户对应User对象
        user = request.user
        address = Address.objects.get_default_addr(user)

        if address:
            is_default = False
        else:
            is_default = True

        # 添加地址
        Address.objects.create(user=user,
                               receiver=receiver,
                               zip_code=zip_code,
                               addr=addr,
                               phone=phone,
                               is_default=is_default)
        # 返回应答 刷新页面
        return redirect(reverse(‘user:address‘))