题目：

1、查看并研究ListAPIView工具视图类，继承该类完成汽车资源的群查接口，汽车资源需要有image资源，查看接口image资源的值

2、研究GenericViewSet工具集，继承该类完成汽车资源的单查，群查，单增，单改，单删接口

urls.py


from . import views
from django.conf.urls import url

urlpatterns = [


url(<span class="hljs-string">r'^v2/Cars/$'</span>, views.CarViewList.as_view()),

url(<span class="hljs-string">r'^v3/Cars/$'</span>, views.CarViewGenericViewSet.as_view({<span class="hljs-string">'get'</span>: <span class="hljs-string">'list'</span>})),
url(<span class="hljs-string">r'^v3/Cars/(?P&lt;pk&gt;\d+)$'</span>, views.CarViewGenericViewSet.as_view(
    {<span class="hljs-string">'get'</span>: <span class="hljs-string">'retrieve'</span>, <span class="hljs-string">'post'</span>: <span class="hljs-string">'create'</span>, <span class="hljs-string">'put'</span>: <span class="hljs-string">'update'</span>, <span class="hljs-string">'patch'</span>: <span class="hljs-string">'partial_update'</span>, <span class="hljs-string">'delete'</span>: <span class="hljs-string">'destroy'</span>})),



]

views.py


class CarViewList(ListAPIView):
    serializer_class = serializers.CarModelSrealizer
    queryset = models.Car.objects.filter(is_delete=False).all()
    lookup_url_kwarg = 'pk'

<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">get</span><span class="hljs-params">(self, request, *args, **kwargs)</span>:</span>
    <span class="hljs-keyword">return</span> self.list(request, *args, **kwargs)



class CarViewGenericViewSet(GenericViewSet, ListModelMixin, RetrieveModelMixin, CreateModelMixin, UpdateModelMixin,

DestroyModelMixin):

serializer_class = serializers.CarModelSrealizer

queryset = models.Car.objects.filter(is_delete=False).all()

lookup_url_kwarg = 'pk'

models.py ``` 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)
image = models.ImageField(upload_to='img', default='media/img/default.png')
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__()