Django+Vue打造购物网站(八)

购物车、订单管理和远程调试

添加商品到购物车

trade/serializers.py

from rest_framework import serializers

from goods.models import Goods
from trade.models import ShoppingCart


class 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"].user
        user = self.context["request"].user
        nums = 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 += nums
            existed.save()
        else:
            # 添加到购物车
            existed = ShoppingCart.objects.create(**validated_data)

        return existed

trade/views.py

from rest_framework import viewsets
from rest_framework.authentication import SessionAuthentication
from rest_framework.permissions import IsAuthenticated
from rest_framework_jwt.authentication import JSONWebTokenAuthentication

from trade.models import ShoppingCart
from trade.serializers import ShopCartSerializer
from utils.permissions import IsOwnerOrReadOnly


class 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 = ShopCartSerializer

    def get_queryset(self):
        return ShoppingCart.objects.filter(user=self.request.user)

urls.py

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

修改购物车数量

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/serializers.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"

vue和购物车接口联调

trade/serializers.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 = ShoppingCart
        fields = ("goods", "nums")

trade/views.py
需要动态选择serializer

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

订单管理接口

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。

trade/serializers.py

# 订单中的商品
class OrderGoodsSerialzier(serializers.ModelSerializer):
    goods = GoodsSerializer(many=False)

    class Meta:
        model = OrderGoods
        fields = "__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 = OrderInfo
        fields = "__all__"


class OrderSerializer(serializers.ModelSerializer):
    user = serializers.HiddenField(
        default=serializers.CurrentUserDefault()
    )
    # 生成订单的时候这些不用post
    pay_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 Random
        random_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_sn

    def validate(self, attrs):
        # validate中添加order_sn，然后在view中就可以save
        attrs["order_sn"] = self.generate_order_sn()
        return attrs

    class Meta:
        model = OrderInfo
        fields = "__all__"

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serializer
    def get_serializer_class(self):
        if self.action == "retrieve":
            return OrderDetailSerializer
        return 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.goods
            order_goods.goods_num = shop_cart.nums
            order_goods.order = order
            order_goods.save()
            # 清空购物车
            shop_cart.delete()
        return order

urls.py

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

远程调试

第三方登录和支付，都需要有服务器(公网IP)，我们可以用pycharm去远程调试服务器代码

配置安全组,开启ssh,数据传输等可以参考之前的部署