drf 序列化练习：

练习：

1.、新建一个django项目，定义一个Car类，有name字符串属性，color整型选择属性(0:银色，1:黑色，2:红色，3:灰色)，price全精度小数类型，image图片文件类型，brand字符串类型

2、基于ModelSerializer类，完成Car资源的单查，群查，单增接口
    序列化：显示车名，车的颜色，车的价格，车的海报，车的品牌
    反序列化：必须提供车名，车的价格，车的品牌(车的匹配需要二次确认re_brand)，车的颜色默认为银色(可以提供)，车的海报不需要提供(默认为空)
"""

models.py

from django.db import models

class Car(models.Model):
    COLOR_CHOICE = {
        （0,'银色'），
        （1,'黑色'），
        （2,'红色'）,
        （3,'灰色'）,
    }
    name = models.CharField(max_length=64,verbose_name='车名',blank=True,unique=True )
    price = models.Decimal(max_length=8，verbose_name='价格')
    img = models.ImageField(upload_to='img',default='img/default.png',verbose_name='海报')
    color = models.IntegerField(choices=SEX_CHOICES,default=0,verbose_name='样式')
    brand = models.CharField(max_length=8，verbose_name='品牌')
    id_delete = models.BooleanField(default=False,verbose_name='是否注销')
    create_time = models.DateTimeField(auto_now_add=True,verbose_name='注册时间')
    
class Meta:
    db_table = 'owen_car'
    verbose_name_plural = 'c车'
def __str__(self):
    return self.username
@property 
def color(self):
    return self.get_color_display()
@property
def icon(self):
    from django.conf import settings
    return '%s%s%s' % (settings.BASE_URL, settings.MEDIA_URL, self.img)

#views.py

from django.conf import settings
from rest_framework.views import APIView
from rest_framework.response import  Response
from . import models
from . import serializers 

class CarView(APIView):
    
    def get(self, request, *args, **kwargs):
        pk = kwargs.get('pk')
        if pk:     # 单查
            user_obj = models.User.objects.filter(is_delete=False, pk=pk).first()
            if not user_obj:
                return Response({
                    'status': 1,
                    'msg': 'pk error',
                }, status=400)
            user_ser = serializers.Car_drf(user_obj,many=False)
            return Response({
                'status': 0,
                'msg': 'ok',
                'results': user_ser.data
            })
        else:    #群查
            user_query = models.User.objects.filter(is_delete=False).all()
            user_ser = serializers.Car_drf(user_query, many=True)

            return Response({
                'status': 0,
                'msg': 'ok',
                'results': user_ser.data
            })
    
        
       #单增
    def post(self, request, *args, **kwargs):
        user_ser = serializers.Car_drf(data=request.data)
        if user_ser.is_valid():
            # 入库
            user_obj = user_ser.save()
            return Response({
                'status': 0,
                'msg': 'ok',
                'results': serializers.Car_drf(user_obj).data
            })
        else:
            return Response({
                'status': 1,
                'msg': user_ser.errors,
            })
    

#serializers.py

from rest_framework import serializers
from django.conf import settings
from . import models

class Car_drf(serializers.ModelSerializer):
    
    re_brand = serializers.CharField(max_length=8，verbose_name='品牌')
    class Meta:
        model = models.Car
        fields = ('name','color','brand','icon','price','')
        extra_kwargs = { 
         'name'{: 'max_length': 10, 'error_messages': {'max_length': '太长'}},
        'color': {'read_only':True},
        'price': {'write_only'},
        'brend': {'write_only'},
       }
   def validate_username(self, value):
        if 'x' in value.lower():
            raise serializers.ValidationError('名字中不能有x')
        return value    
   def validate(self,attrs):
        name = attrs.get('name')
        brand =attrs.get('brand')
        re_brand = attrs.get('band')
        if brand !=re_brand:
            raise serializers.ValidationError({'re_password': '两次品牌选择不一致'})
|       return attrs
            
        
         

序列化练习

原文：https://www.cnblogs.com/shaozheng/p/12099214.html