作业 day72

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)

# model.py
from django.db import models


class Car(models.Model):
    """
    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
    """
    COLOR_CHOICES = [(0, '银色'), (1, '黑色'), (2, '红色'), (3, '灰色')]
    name = models.CharField(max_length=64)
    color = models.IntegerField(choices=COLOR_CHOICES, default=0)
    price = models.DecimalField(max_digits=10, decimal_places=2)
    image = models.ImageField(upload_to='img', default='img/default.png')
    brand = models.CharField(max_length=64)

    @property
    def car_color(self):
        return self.get_color_display()

serializers.py

from rest_framework import serializers
from . import models


class CarModelSerializer(serializers.ModelSerializer):
    re_brand = serializers.CharField(write_only=True)

    class Meta:
        model = models.Car
        fields = ['name', 'price', 'color', 'car_color', 'image', 'brand', 're_brand']
        extra_kwargs = {
            'image': {
                'read_only': True
            },
            'color': {
                'write_only': True
            }
        }

    def validate(self, attrs):
        brand = attrs.get('brand')
        re_brand = attrs.pop('re_brand')
        if brand != re_brand:
            raise serializers.ValidationError({'re_brand': '品牌不一致'})
        return attrs

总路由

from django.conf.urls import url, include
from django.contrib import admin
from django.views.static import serve
from django.conf import settings
urlpatterns = [
    url(r'^admin/', admin.site.urls),

    url(r'^api/', include('api.urls')),


    url(r'^media/(?P<path>.*)', serve, {'document_root': settings.MEDIA_ROOT}),
]

子路由

from django.conf.urls import url

from . import views

urlpatterns = [
    # 自定义序列化
    url(r'^cars/$', views.CarAPIView.as_view()),
    url(r'^cars/(?P<pk>\d+)/$', views.CarAPIView.as_view()),

    url(r'^publishes/$', views.PublishAPIView.as_view()),
]

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