Day 74 作业 汽车系统

'''
2、完成汽车系统表模型的建立（表关系自己设计）
    汽车表、汽车商家表、赞助商表、赞助商详情表
'''


from django.db import models

# 汽车表、汽车商家表、赞助商表、赞助商详情表
class BaseModel(models.Model):
    is_delete = models.BooleanField(default=False)
    createdTime = models.DateTimeField(auto_now_add=True)
    class Meta:
        abstract = True

class Car(BaseModel):
    name = models.CharField(max_length=64)
    price = models.DecimalField(max_digits=10, decimal_places=2)
    brand = models.ForeignKey(to='Brand', db_constraint=False, null=True, on_delete=models.SET_NULL, related_name='cars')
    sponsors = models.ManyToManyField(to='Sponsor', db_constraint=False, related_name='cars')

    @property
    def brand_name(self):
        return self.brand.name

    @property
    def sponsor_list(self):
        sponsor_list_temp = []
        for sponsor in self.sponsors.all():
            sponsor_dic = {
                'name': sponsor.name
            }
            try:
                sponsor_dic['phone'] = sponsor.detail.phone
            except:
                sponsor_dic['phone'] = '未知'
            sponsor_list_temp.append(sponsor_dic)
        return sponsor_list_temp

    class Meta:
        verbose_name_plural = '汽车'

    def __str__(self):
        return self.name

class Brand(BaseModel):
    name = models.CharField(max_length=64)

    class Meta:
        verbose_name_plural = '品牌'

    def __str__(self):
        return self.name

class Sponsor(BaseModel):
    name = models.CharField(max_length=64)

    @property
    def phone(self):
        try:
            return self.detail.phone
        except:
            return "无"

    class Meta:
        verbose_name_plural = '赞助商'

    def __str__(self):
        return self.name

class SponsorDetail(BaseModel):
    phone = models.CharField(max_length=11)
    sponsor = models.OneToOneField(to=Sponsor, db_constraint=False, on_delete=models.CASCADE, related_name='detail')

    class Meta:
        verbose_name_plural = '赞助商详情'

    def __str__(self):
        try:  # 连表可能会出现问题，所以要异常处理
            return self.sponsor.name + '的详情'
        except:
            return super().__str__()

'''
3、完成汽车系统的接口编写
    汽车表：八大接口(不需要写put方法)
    汽车商家表：八大接口(不需要写put方法)
'''

class CarModelViewSet(ModelViewSet):
    queryset = models.Car.objects.filter(is_delete=False).all()
    serializer_class = serializers.CarModelSerializer
    # 分析：从实际开发角度分析不合理点
    # 1）没有群增，群整体改，群局部改，群删四个接口
    # 2）删除操作视图集默认走的destroy方法是将资源从数据库中删除，通常一个做字段is_delete字段修改表示删除
    # 3）响应的结果只有数据，没有数据状态码和状态信息

    # 解决1,
    # 群整体改，群局部改，全删三个接口可以独立成三个方法
    # def many_update(self, request, *args, **kwargs):
    #     return APIResponse(msg='这个地方是群整体改，你会写！')
    def many_partial_update(self, request, *args, **kwargs):
        return APIResponse(msg='这个地方是群局部改，你会写！')
    def many_destroy(self, request, *args, **kwargs):
        return APIResponse(msg='这个地方是群删，你会写！')
    # 群增与单增必须公用一个接口，都要走create方法 - 重写create方法，用逻辑进行拆分
    def create(self, request, *args, **kwargs):
        request_data = request.data
        if isinstance(request_data, list):
            car_ser = self.get_serializer(data=request_data, many=True)
            car_ser.is_valid(raise_exception=True)
            car_obj = car_ser.save()
            return APIResponse(msg='群增成功', results=self.get_serializer(car_obj, many=True).data)

        return super().create(request, *args, **kwargs)


    # 解决2，destroy方法是完成is_delete字段值修改 - 重写destroy方法，自定义实现体
    def destroy(self, request, *args, **kwargs):
        car_obj = self.get_object()
        car_obj.is_delete = True
        car_obj.save()
        return APIResponse(msg='删除成功')


    # 解决3，让群查有状态码和状态信息 - 重写list方法
    def list(self, request, *args, **kwargs):
        response = super().list(request, *args, **kwargs)
        return APIResponse(results=response.data)