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
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)
模型层
from django.db import models
# Create your models here.
class BaseModel(models.Model):
is_delete = models.BooleanField(default=False)
create_time = models.DateTimeField(auto_now_add=True)
class Meta:
# 基表，为抽象表，是专门用来被继承，提供公有字段的，自身不会完成数据库迁移
abstract = True
class Car(BaseModel):
name = models.CharField(max_length=64)
price = models.DecimalField(max_digits=10, decimal_places=2)
merchant = models.ForeignKey(to='Merchant', related_name='cars', db_constraint=False, on_delete=models.DO_NOTHING)
sponsor = models.ForeignKey(to='Sponsor', related_name='cars', db_constraint=False, on_delete=models.DO_NOTHING)
@property
def merchant_info(self):
return {
'name': self.merchant.name,
'address': self.merchant.address
}
@property
def sponsor_list(self):
sponsor_list_temp = [] # 存放所有作者格式化成数据的列表
sponsors = self.sponsor.all() # 所有作者
for sponsor in sponsors: # 遍历处理所有作者
sponsor_dic = {
'name': sponsor.name,
}
try: # 有详情才处理详情信息
sponsor_dic['model'] = sponsor.detail.mobile
except:
sponsor_dic['model'] = '无'
sponsor_list_temp.append(sponsor_dic) # 将处理过得数据添加到数据列表中
return sponsor_list_temp # 返回处理后的结果
def __str__(self):
return self.name
class Merchant(BaseModel):
name = models.CharField(max_length=64)
class Sponsor(BaseModel):
name = models.CharField(max_length=64)
class SponsorDetail(BaseModel):
mobile = models.CharField(max_length=64)
sponsor = models.OneToOneField(to=Sponsor, related_name='detail', db_constraint=False, on_delete=models.DO_NOTHING)
视图层
from django.shortcuts import render
from rest_framework.views import APIView
from rest_framework.response import Response
from . import models, serializers
from .response import APIResponse
class CarAPIView(APIView):
# 单查群查
def get(self, request, *args, **kwargs):
pk = kwargs.get('pk')
if pk:
car_obj = models.Car.objects.filter(is_delete=False, pk=pk).first()
car_ser = serializers.CarModelSerializer(car_obj)
else:
car_query = models.car.objects.filter(is_delete=False).all()
car_ser = serializers.CarModelSerializer(car_query, many=True)
return APIResponse(results=car_ser.data)
# 单删群删
def delete(self, request, *args, **kwargs):
pk = kwargs.get('pk')
if pk:
pks = [pk] # 将单删格式化成群删的一条
else:
pks = request.data # 群删
try: # 数据如果有误，数据库执行会出错
rows = models.Car.objects.filter(is_delete=False, pk__in=pks).update(is_delete=True)
except:
return APIResponse(1, '数据有误')
if rows:
return APIResponse(0, '删除成功')
return APIResponse(1, '删除失败')
# 整体单改群改
def put(self, request, *args, **kwargs):
pk = kwargs.get('pk')
if pk: # 单改
try:
# 与增的区别在于，需要明确被修改的对象，交给序列化类
car_instance = models.Car.objects.get(is_delete=False, pk=pk)
except:
return Response({'detail': 'pk error'}, status=400)
car_ser = serializers.CarModelSerializer(instance=car_instance, data=request.data)
car_ser.is_valid(raise_exception=True)
car_obj = car_ser.save()
return APIResponse(request=serializers.CarModelSerializer(car_obj).data)
else: # 群改
request_data = request.data
try:
pks = []
for dic in request_data:
pk = dic.pop('pk') # 解决分析1，没有pk pop方法就会抛异常
pks.append(pk)
car_query = models.Car.objects.filter(is_delete=False, pk__in=pks).all()
if len(pks) != len(car_query):
raise Exception('pk对应的数据不存在')
except Exception as e:
return Response({'detail': '%s' % e}, status=400)
car_ser = serializers.CarModelSerializer(instance=car_query, data=request.data, many=True)
car_ser.is_valid(raise_exception=True)
car_list = car_ser.save()
return APIResponse(request=serializers.CarModelSerializer(car_list, many=True).data)
# 局部单改群改
def patch(self, request, *args, **kwargs):
pk = kwargs.get('pk')
if pk: # 单改
try:
# 与增的区别在于，需要明确被修改的对象，交给序列化类
car_instance = models.Car.objects.get(is_delete=False, pk=pk)
except:
return Response({'detail': 'pk error'}, status=400)
car_ser = serializers.CarModelSerializer(instance=car_instance, data=request.data, partial=True,
context={'request': request})
car_ser.is_valid(raise_exception=True)
car_obj = car_ser.save()
return APIResponse(request=serializers.CarModelSerializer(car_obj).data)
else: # 群改
request_data = request.data
try:
pks = []
for dic in request_data:
pk = dic.pop('pk') # 解决分析1，没有pk pop方法就会抛异常
pks.append(pk)
car_query = models.Car.objects.filter(is_delete=False, pk__in=pks).all()
if len(pks) != len(car_query):
raise Exception('pk对应的数据不存在')
except Exception as e:
return Response({'detail': '%s' % e}, status=400)
car_ser = serializers.CarModelSerializer(instance=car_query, data=request.data, many=True, partial=True)
car_ser.is_valid(raise_exception=True)
car_list = car_ser.save()
return APIResponse(request=serializers.CarModelSerializer(car_list, many=True).data)序列化
from rest_framework import serializers
from . import models
# 多表操作
class CarListSerializer(serializers.ListSerializer):
# 自定义的群增辅助类，没有必要重写create方法
def create(self, validated_data):
return super().create(validated_data)
#自定义的群改辅助类
def update(self, instance_list, validated_data_list):
return [
self.child.update(instance_list[index], attrs) for index, attrs in enumerate(validated_data_list)
]
class CarModelSerializer(serializers.ModelSerializer):
class Meta:
list_serializer_class = CarListSerializer
model = models.Car
fields = ['name', 'price', 'merchant', 'sponsor', 'merchant_info', 'sponsor_list']
extra_kwargs = {
'merchant': {
'write_only': True
},
'sponsor': {
'write_only': True
}
}
# 验证视图类是否将request请求参数通过context传入
def validate(self, attrs):
print('传入的request: %s' % self.context.get('request'))
return attrs
response二次封装
from rest_framework.response import Response
class APIResponse(Response):
def __init__(self, status=0, msg='ok', results=None, http_status=None,
headers=None, exception=False, content_type=None, **kwargs):
# 将status、msg、results、kwargs格式化成data
data = {
'status': status,
'msg': msg,
}
# results只要是不为空都是数据：False 0 '' 都是数据=>条件不能写if results
if results is not None:
data['results'] = results
# 将kwargs中额外的k-v数据添加到data中
data.update(**kwargs)
super().__init__(data=data, status=http_status, headers=headers, exception=exception, content_type=content_type)