Django REST framework+Vue 打造生鲜超市（九）

生鲜超市（一）生鲜超市（二）生鲜超市（三）

生鲜超市（四）生鲜超市（五）生鲜超市（六）

生鲜超市（七）生鲜超市（八）生鲜超市（九）

生鲜超市（十）生鲜超市（十一）生鲜超市（十二）生鲜超市（十三）

代码下载

github

教程

学习自慕课网-前端vue结合后端DjangoFramework的在线生鲜超市

十、购物车、订单管理和支付功能

10.1.添加商品到购物车

（1）trade/serializer.py

# trade/serializer.py
__author__ = 'derek'from .models import ShoppingCart
from rest_framework import serializers
from goods.models import Goodsclass ShopCartSerializer(serializers.Serializer):#获取当前登录的用户user = serializers.HiddenField(default=serializers.CurrentUserDefault())nums = serializers.IntegerField(required=True, label="数量",min_value=1,error_messages={"min_value":"商品数量不能小于一","required": "请选择购买数量"})#这里是继承Serializer，必须指定queryset对象，如果继承ModelSerializer则不需要指定#goods是一个外键，可以通过这方法获取goods object中所有的值goods = serializers.PrimaryKeyRelatedField(required=True, queryset=Goods.objects.all())#继承的Serializer没有save功能，必须写一个create方法def create(self, validated_data):# validated_data是已经处理过的数据#获取当前用户# view中:self.request.user；serizlizer中:self.context["request"].useruser = self.context["request"].usernums = validated_data["nums"]goods = validated_data["goods"]existed = ShoppingCart.objects.filter(user=user, goods=goods)#如果购物车中有记录，数量+1#如果购物车车没有记录，就创建if existed:existed = existed[0]existed.nums += numsexisted.save()else:#添加到购物车existed = ShoppingCart.objects.create(**validated_data)return existed

（2）trade/views.py

# trade/views.pyfrom rest_framework import viewsets
from rest_framework.permissions import IsAuthenticated
from utils.permissions import IsOwnerOrReadOnly
from rest_framework_jwt.authentication import JSONWebTokenAuthentication
from rest_framework.authentication import SessionAuthentication
from .serializers import ShopCartSerializer
from .models import ShoppingCartclass ShoppingCartViewset(viewsets.ModelViewSet):"""购物车功能list:获取购物车详情create：加入购物车delete：删除购物记录"""permission_classes = (IsAuthenticated, IsOwnerOrReadOnly)authentication_classes = (JSONWebTokenAuthentication, SessionAuthentication)serializer_class = ShopCartSerializerdef get_queryset(self):return ShoppingCart.objects.filter(user=self.request.user

（3）配置url

# 配置购物车的url
router.register(r'shopcarts', ShoppingCartViewset, base_name="shopcarts")

10.1.添加购物车数量

Serializer继承BaseSerializer，但是Seriazer中并没有重新update方法，所有添加一个update方法

trade/serializer.py

 def update(self, instance, validated_data):# 修改商品数量instance.nums = validated_data["nums"]instance.save()return instance

在view中要把商品id传过去

 lookup_field = "goods_id"

10.3.vue和购物车接口联调

购物车中可以看商品详情，需要写一个商品详情的serializer,所有在view中需要动态设置serializer

（1）trade/serializer.py

class ShopCartDetailSerializer(serializers.ModelSerializer):'''购物车商品详情信息'''# 一个购物车对应一个商品goods = GoodsSerializer(many=False, read_only=True)class Meta:model = ShoppingCartfields = ("goods", "nums")

（2）trade/views.py

需要动态选择serializer

    def get_serializer_class(self):if self.action == 'list':return ShopCartDetailSerializerelse:return ShopCartSerializer

10.4.订单管理接口

（1）trade/serializer.py

用户添加商品到购物车，点去购物车结算，填上地址留言，结算生成订单，在会员中心我的订单里面，可以看到订单列表，点订单可以看到订单的详细信息。

#订单中的商品
class OrderGoodsSerialzier(serializers.ModelSerializer):goods = GoodsSerializer(many=False)class Meta:model = OrderGoodsfields = "__all__"#订单商品信息
# goods字段需要嵌套一个OrderGoodsSerializer
class OrderDetailSerializer(serializers.ModelSerializer):goods = OrderGoodsSerialzier(many=True)class Meta:model = OrderInfofields = "__all__"class OrderSerializer(serializers.ModelSerializer):user = serializers.HiddenField(default=serializers.CurrentUserDefault())#生成订单的时候这些不用postpay_status = serializers.CharField(read_only=True)trade_no = serializers.CharField(read_only=True)order_sn = serializers.CharField(read_only=True)pay_time = serializers.DateTimeField(read_only=True)nonce_str = serializers.CharField(read_only=True)pay_type = serializers.CharField(read_only=True)def generate_order_sn(self):#生成订单号# 当前时间+userid+随机数from random import Randomrandom_ins = Random()order_sn = "{time_str}{userid}{ranstr}".format(time_str=time.strftime("%Y%m%d%H%M%S"),userid=self.context["request"].user.id,ranstr=random_ins.randint(10, 99))return order_sndef validate(self, attrs):#validate中添加order_sn，然后在view中就可以saveattrs["order_sn"] = self.generate_order_sn()return attrsclass Meta:model = OrderInfofields = "__all__"

（2）trade/views.py

class OrderViewset(mixins.ListModelMixin, mixins.RetrieveModelMixin, mixins.CreateModelMixin, mixins.DestroyModelMixin,viewsets.GenericViewSet):"""订单管理list:获取个人订单delete:删除订单create：新增订单"""permission_classes = (IsAuthenticated, IsOwnerOrReadOnly)authentication_classes = (JSONWebTokenAuthentication, SessionAuthentication)serializer_class = OrderSerializer#动态配置serializerdef get_serializer_class(self):if self.action == "retrieve":return OrderDetailSerializerreturn OrderSerializer#获取订单列表def get_queryset(self):return OrderInfo.objects.filter(user=self.request.user)#在订单提交保存之前还需要多两步步骤，所以这里自定义perform_create方法#1.将购物车中的商品保存到OrderGoods中#2.清空购物车def perform_create(self, serializer):order = serializer.save()# 获取购物车所有商品shop_carts = ShoppingCart.objects.filter(user=self.request.user)for shop_cart in shop_carts:order_goods = OrderGoods()order_goods.goods = shop_cart.goodsorder_goods.goods_num = shop_cart.numsorder_goods.order = orderorder_goods.save()#清空购物车
            shop_cart.delete()return order

（3）配置url

# 配置订单的url
router.register(r'orders', OrderViewset, base_name="orders")

转载于:https://www.cnblogs.com/derek1184405959/p/8846501.html