Django+Vue开发生鲜电商平台之10.购物车、订单管理和支付功能

很多机遇是外界赋予的，这方面我们自己觉得很幸运，所以更加不能浪费这个机会，应该想得更多。而不能说你现在得到的是自然的，别人打不赢你，我们从来都会很担心，不会觉得自己很强。
——马化腾

Github和Gitee代码同步更新：
https://github.com/PythonWebProject/Django_Fresh_Ecommerce；
https://gitee.com/Python_Web_Project/Django_Fresh_Ecommerce。

一、购物车功能实现

1.加入购物车功能实现

购物车需要实现在商品详情页面将该商品加入购物车后，右上角同步显示，并且点击去结算会同步显示，并且价格与数量同步，具体包括了增删改查等操作，在apps/trade中实现。

在spps/trade下新建serializers.py如下：

from rest_framework import serializers

from goods.models import Goods
from .models import ShoppingCart

class ShoppingCartSerializer(serializers.Serializer):
    user = serializers.HiddenField(default=serializers.CurrentUserDefault())
    nums = serializers.IntegerField(required=True, min_value=1, label='数量',
                                    error_messages={
                                        'required': '请选择商品数量',
                                        'min_value': '商品数量至少为1'
                                    })
    goods = serializers.PrimaryKeyRelatedField(required=True, queryset=Goods.objects.filter(is_delete=False))

    def create(self, validated_data):
        '''新增数据'''
        user = self.context['request'].user
        nums = validated_data['nums']
        goods = validated_data['goods']
        existed = ShoppingCart.objects.filter(is_delete=False, user=user, goods=goods)
        if existed:
            existed = existed[0]
            existed.nums += 1
            existed.save()
        else:
            existed = ShoppingCart.objects.create(**validated_data)
        return existed

模型修改如下：

class ShoppingCart(models.Model):
    '''购物车'''
    user = models.ForeignKey(User, verbose_name='用户', null=True, on_delete=models.SET_NULL)
    goods = models.ForeignKey(Goods, verbose_name='商品', null=True, on_delete=models.SET_NULL)
    nums = models.IntegerField(default=0, verbose_name='商品数量')

    add_time = models.DateTimeField(default=datetime.now, verbose_name=u'添加时间')
    is_delete = models.BooleanField(default=False, verbose_name='是否删除')

    class Meta:
        verbose_name = '购物车'
        verbose_name_plural = verbose_name
        unique_together = ('user', 'goods')

    def __str__(self):
        return '%s(%d)'.format(self.goods.name, self.nums)

因为在一个用户的购物车中的一个商品是唯一的，因此需要给ShoppingCart模型增加unique_together = ('user', 'goods')约束，并且导致了在定义序列化时只能继承自Serializer而不能继承自ModelSerializer，因为在ModelSerializer中的create()方法可能因为插入数据时重复而验证不通过导致抛出异常，无法继续执行，而继承自Serializer有更高的灵活性和代码复用性。

apps/trade/views.py中定义视图如下：

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

from utils.permissions import IsOwnerOrReadOnly
from .serializers import ShoppingCartSerializer
from .models import ShoppingCart

# Create your views here.


class ShoppingCartViewSet(viewsets.ModelViewSet):
    '''
    list:
        购物车列表
    create:
        加入购物车
    update:
        购物车修改
    delete:
        删除购物车
    '''

    permission_classes = [IsAuthenticated, IsOwnerOrReadOnly]
    authentication_classes = [JSONWebTokenAuthentication, SessionAuthentication]
    serializer_class = ShoppingCartSerializer

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

为了获取购物车列表，需要在视图中实现get_queryset()方法。

urls.py中定义路由如下：

# 配置购物车路由
router.register(r'shopcarts', ShoppingCartViewSet, basename='shopcarts')

API测试如下：

显然可以新增和更新数据。

2.修改购物车数量功能实现

因为定义的ShoppingCartSerializer继承自Serializer，而Serializer又继承自BaseSerializer，BaseSerializer中声明了update(instance, validated_data)方法但是直接抛出异常，并且Serializer中并未重写该方法，因此如果在ShoppingCartSerializer中不重写该方法会导致在修改购物车详情时会抛出异常，如果继承自ModelSerializer则不需要重写，在ShoppingCartSerializer中重写update(instance, validated_data)方法如下：

class ShoppingCartSerializer(serializers.Serializer):
    user = serializers.HiddenField(default=serializers.CurrentUserDefault())
    nums = serializers.IntegerField(required=True, min_value=1, label='数量',
                                    error_messages={
                                        'required': '请选择商品数量',
                                        'min_value': '商品数量至少为1'
                                    })
    goods = serializers.PrimaryKeyRelatedField(required=True, queryset=Goods.objects.filter(is_delete=False))

    def create(self, validated_data):
        '''新增数据'''
        user = self.context['request'].user
        nums = validated_data['nums']
        goods = validated_data['goods']
        existed = ShoppingCart.objects.filter(is_delete=False, user=user, goods=goods)
        if existed:
            existed = existed[0]
            existed.nums += 1
            existed.save()
        else:
            existed = ShoppingCart.objects.create(**validated_data)
        return existed

    def update(self, instance, validated_data):
        # 修改购物车商品数量
        instance.nums = validated_data['nums']
        instance.save()
        return instance

再次访问测试修改和删除某一个购物车记录如下：

此时，已实现修改和删除购物车记录详情。

3.和Vue结合实现购物车功能

可以看到，在购物车中会显示商品详情，因此需要再定义一个序列化实现商品详情动态显示：

class ShoppingCartDetailSerializer(serializers.ModelSerializer):
    goods = GoodsSerializer(many=False)

    class Meta:
        model = ShoppingCart
        fields = '__all__'

views.py如下：

class ShoppingCartViewSet(viewsets.ModelViewSet):
    '''
    list:
        购物车列表
    create:
        加入购物车
    update:
        购物车修改
    delete:
        删除购物车
    '''

    permission_classes = [IsAuthenticated, IsOwnerOrReadOnly]
    authentication_classes = [JSONWebTokenAuthentication, SessionAuthentication]
    serializer_class = ShoppingCartSerializer
    lookup_field = 'goods_id'

    def get_serializer_class(self):
        if self.action == 'list':
            return ShoppingCartDetailSerializer
        else:
            return ShoppingCartSerializer

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

现在访问购物车列表，如下：

显然，购物车的商品详情已显示出来。

此时再看前端，在src/views/productDetail/productDetail.vue中：

<li class="skunum_li cle">
    <span class="lbl">数   量span>
    <div class="skunum" id="skunum"> <span class="minus" title="减少1个数量" @click="reduceNum"><i class="iconfont">-i>span>
        <input id="number" name="number" type="text" min="1" v-model="buyNum"  onchange="countNum(0)">
        <span class="add" title="增加1个数量" @click="addNum"><i class="iconfont">+i>span> <cite class="storage"> 件 cite>
    div>
    <div class="skunum" id="skunum">

        <cite class="storage">(<font id="shows_number">{{proDetail.goods_num}}件font>)cite>

    div>
li>
<li class="add_cart_li">
    <a class="btn" id="buy_btn" @click="addShoppingCart">
        <i class="iconfont">i>
        加入购物车a>
li>

addShoppingCart () { //加入购物车
    addShopCart({
        goods: this.productId, // 商品id
        nums: this.buyNum, // 购买数量
    }).then((response)=> {
        this.$refs.model.setShow();
        // 更新store数据
        this.$store.dispatch('setShopList');

    }).catch(function (error) {
        console.log(error);
    });
},

在添加购物车时，调用addShoppingCart()方法，并调用addShopCart实现数据交互。

在src/views/head/head.vue中：

<div class="hd_cart" id="ECS_CARTINFO"  @mouseover="overShopCar" @mouseout="outShopCar">
    

        <b class="iconfont">b>去购物车结算<span><i class="iconfont">i>span>
        <em class="num" id="hd_cartnum" style="visibility: visible;">{{goods_list.goods_list.length}}em>router-link>
            <div class="list" v-show="showShopCar">
                <div class="data">
                    <dl v-for="(item,index) in goods_list.goods_list">
                    <dt><img :src="item.goods.goods_front_image">router-link>dt>
                    <dd>
                        <h4>{{item.goods.name}}router-link>h4>
                        <p><span class="red">{{item.goods.shop_price}}span> <i>Xi> {{item.nums}}p>
                        <a title="删除" class="iconfont del" @click="deleteGoods(index,item.goods.id)">×a>dd>
                    dl>
                div>
                <div class="count">共<span class="red" id="hd_cart_count">{{goods_list.length}}span>件商品哦~
                        <p>总价:<span class="red"><em id="hd_cart_total">{{goods_list.totalPrice}}em>span>
                        去结算
                        router-link>
                        p>
                div>
            div>
div>

显示出购物车中的商品信息，并计算总价，并显示去结算的链接。

src/views/cart/cart.vue如下：

<div class="cart-box" id="cart-box">
    <div class="hd"> <span class="no2" id="itemsnum-top">{{goods.goods_list.length}}件商品span>
    <span class="no4">单价span> <span>数量span> <span>小计span>
    div>
    <div class="goods-list">
    <ul>
        <li class="cle hover" style="border-bottom-style: none;" v-for="(item,index) in goods.goods_list">
        <div class="pic">
            <a target="_blank"> <img :alt="item.goods.name" :src="item.goods.goods_front_image">a>
        div>
        <div class="name">
            <a target="_blank">{{item.goods.name}}a>
            <p>p>
        div>
        <div class="price-xj">
            <p><em>￥{{item.goods.shop_price}}元em>p>
        div>
        <div class="nums" id="nums">
            <span class="minus" title="减少1个数量" @click="reduceCartNum(index, item.goods.id);">-span>
            <input type="text"  v-model="item.nums" >
            <span class="add" title="增加1个数量" @click="addCartNum(index, item.goods.id);">+span>
        div>
        <div class="price-xj"><span>span>
            <em id="total_items_3137">￥{{item.goods.shop_price * item.nums}}元em>
        div>
        <div class="del">
            <a class="btn-del" @click="deleteGoods(index, item.goods.id)">删除a>
        div>
        li>
    ul>
    div>

    <div class="fd cle">
    <div class="fl">
        <p class="no1"> <a id="del-all" @click="delAll">清空购物车a> p>
        <p><a class="graybtn" @click="continueShopping">继续购物a>p>
    div>
    <div class="fr" id="price-total">
        <p><span id="selectedCount">{{goods.goods_list.length}}span>件商品，总价：<span class="red"><strong id="totalSkuPrice">￥{{totalPrice}}元strong>span>p>
    div>
    <div class="extr">
        <div class="address">
        <p class="title">配送地址p>
        <ul>
            <li class="add" @click="addAddr">
            
                +
                点击添加地址router-link>
            li>
            <li v-for="item in addrInfo" :class="{'addressActive':addressActive==item.id}" @click="selectAddr(item.id)">
            <p class="item">地址：{{item.province}} {{item.city}} {{item.district}} {{item.address}}p>
            <p class="item">电话：{{item.signer_mobile}}p>
            <p class="item">姓名：{{item.signer_name}}p>
            li>
        ul>
        div>
        <div class="pay">
        <p class="title">选择支付方式p>
        <p class="payWrap"><img v-for="item in payWrapList" src="../../static/images/alipay.jpg" :class="{'payWrapActive':payWrapActive==item.id}" @click="selectPay(item.id)">p>
        div>
    div>
    <textarea type="text" v-model="post_script" placeholder="请输入留言" style="margin-top: 10px; height:50px;width: 100%;">
    textarea>
    <p class="sumup"><a class="btn" @click="balanceCount">去结算a>p>
    div>
div>

created () {
    // 请求购物车商品
    getShopCarts().then((response)=> {
    console.log(response.data)
    // 更新store数据
    //this.goods_list = response.data;
    var totalPrice = 0
    this.goods.goods_list = response.data;
    response.data.forEach(function(entry) {
        totalPrice += entry.goods.shop_price*entry.nums
        console.log(entry.goods.shop_price);
    });

    this.goods.totalPrice = totalPrice
    this.totalPrice = totalPrice
    }).catch(function (error) {
    });
    this.getAllAddr ()

},

addCartNum(index, id) { //添加数量
updateShopCart(id,{
    nums: this.goods.goods_list[index].nums+1
}).then((response)=> {
    this.goods.goods_list[index].nums = this.goods.goods_list[index].nums + 1;
    // 更新store数据
    this.$store.dispatch('setShopList');
    //更新总价
    this.setTotalPrice();

}).catch(function (error) {
    console.log(error);
});
},
setTotalPrice(){
var goods_list = this.goods.goods_list;
var totalPrice = 0;
for(var i = 0;i {
    console.log(response.data);
    this.goods.goods_list.splice(index,1);

    // 更新store数据
    this.$store.dispatch('setShopList');

}).catch(function (error) {
    console.log(error);
});
},
reduceCartNum(index, id) { //删除数量
if(this.goods.goods_list[index].nums<=1){
    this.deleteGoods(index, id)
}else{
    updateShopCart(id,{
    nums: this.goods.goods_list[index].nums-1
    }).then((response)=> {
    this.goods.goods_list[index].nums = this.goods.goods_list[index].nums - 1;
    // 更新store数据
    this.$store.dispatch('setShopList');
    //更新总价
    this.setTotalPrice();

    }).catch(function (error) {
    console.log(error);
    });
}


},
continueShopping () { // 继续购物
this.$router.push({name: 'index'});
},
delAll () { //清空购物车

this.$http.post('/shoppingCart/clear', {

}).then((response)=> {
    console.log(response.data);
    this.goods.goods_list.splice(0, this.goods.goods_list.length);
    // 更新store数据
    this.$store.dispatch('setShopList');

}).catch(function (error) {
    console.log(error);
});
},
selectPay(id){
this.payWrapActive = id;
},
getAllAddr () { //获得所有配送地址
getAddress().then((response)=> {
    this.addrInfo = response.data;
}).catch(function (error) {
    console.log(error);
});
},
addAddr () { //添加地址

},
selectAddr (id) { //选择配送地址
this.addressActive = id;
var cur_address = ''
var cur_name = ''
var cur_mobile = ''
this.addrInfo.forEach(function(addrItem) {
    if(addrItem.id == id){
    cur_address = addrItem.province+addrItem.city+addrItem.district+addrItem.address
    cur_name = addrItem.signer_name
    cur_mobile = addrItem.signer_mobile
    }
});
this.address = cur_address
this.signer_mobile = cur_mobile
this.signer_name = cur_name
},
balanceCount () { // 结算
    if(this.addrInfo.length==0){
        alert("请选择收货地址")
    }else{
    createOrder(
        {
        post_script:this.post_script,
        address:this.address,
        signer_name:this.signer_name,
        singer_mobile:this.signer_mobile,
        order_mount:this.totalPrice
        }
    ).then((response)=> {
        alert('订单创建成功')
        window.location.href=response.data.alipay_url;
    }).catch(function (error) {
        console.log(error);
    });
    }
},

初始化时调用getShopCarts接口获取所有购物车记录，并调用getAllAddr()获取收货地址，再通过for循环见给购物车里路和收货地址显示出来；减少商品数量调用reduceCartNum(index, id)方法，分情况调用deleteGoods(index, id)方法和updateShopCart接口；增加商品数量调用addCartNum(index, id)方法，调用updateShopCart接口实现数据交互；删除记录调用deleteGoods(index,id)方法，通过deleteShopCart接口实现数据交互；清空购物车通过delAll()方法实现；继续购物通过continueShopping()方法实现；通过调用addAddr()方法实现添加收货地址；通过selectAddr(id)方法选择收货地址；调用selectPay(id)方法选择支付方式；并调用balanceCount()进行结算。

api.js修改接口如下：

//获取购物车商品
export const getShopCarts = params => { return axios.get(`${local_host}/shopcarts/`) }
// 添加商品到购物车
export const addShopCart = params => { return axios.post(`${local_host}/shopcarts/`, params) }
//更新购物车商品信息
export const updateShopCart = (goodsId, params) => { return axios.patch(`${local_host}/shopcarts/`+goodsId+'/', params) }
//删除某个商品的购物记录
export const deleteShopCart = goodsId => { return axios.delete(`${local_host}/shopcarts/`+goodsId+'/') }

演示如下：

此时，可以实现购物车的基本功能。

二、订单功能实现

1.订单管理接口

OrderInfo模型中，有order_sn字段表示订单编号，是在提交订单之后生成的，因此在创建记录时应该允许为空，OrderInfo模型修改如下：

class OrderInfo(models.Model):
    '''订单信息'''
    ORDER_STATUS = (
        ('success', '成功'),
        ('cancel', '取消'),
        ('paying', '待支付'),
    )
    user = models.ForeignKey(User, verbose_name='用户', null=True, on_delete=models.SET_NULL)
    order_sn = models.CharField(max_length=30, unique=True, null=True, blank=True, verbose_name='订单号')
    trade_no = models.CharField(max_length=50, unique=True, null=True, blank=True, verbose_name='交易号')
    pay_status = models.CharField(max_length=100, default='paying', choices=ORDER_STATUS, verbose_name='订单状态')
    post_script = models.CharField(max_length=11, verbose_name='订单留言')
    order_mount = models.FloatField(default=0.0, verbose_name='订单金额')
    pay_time = models.DateTimeField(null=True, blank=True, verbose_name='支付时间')

    # 用户基本信息
    address = models.CharField(max_length=100, default='', verbose_name='收货地址')
    signer_name = models.CharField(max_length=20, default='', verbose_name='签收人')
    signer_mobile = models.CharField(max_length=11, verbose_name='联系电话')

    add_time = models.DateTimeField(default=datetime.now, verbose_name=u'添加时间')
    is_delete = models.BooleanField(default=False, verbose_name='是否删除')

    class Meta:
        verbose_name = u"订单"
        verbose_name_plural = verbose_name

    def __str__(self):
        return str(self.order_sn)


class OrderGoods(models.Model):
    '''订单商品详情'''
    order = models.ForeignKey(OrderInfo, verbose_name='订单信息', null=True, on_delete=models.CASCADE)
    goods = models.ForeignKey(Goods, verbose_name='商品', null=True, on_delete=models.SET_NULL)
    goods_num = models.IntegerField(default=0, verbose_name='商品数量')

    add_time = models.DateTimeField(default=datetime.now, verbose_name=u'添加时间')
    is_delete = models.BooleanField(default=False, verbose_name='是否删除')

    class Meta:
        verbose_name = '订单商品'
        verbose_name_plural = verbose_name

    def __str__(self):
        return str(self.order.order_sn)

定义序列化如下：

class OrderSerializer(serializers.ModelSerializer):
    user = serializers.HiddenField(default=serializers.CurrentUserDefault())
    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)
    is_delete = serializers.BooleanField(read_only=True)

    def generate_order_sn(self):
        # 生成订单编号
        return '%s%d%d' % (time.strftime('%Y%m%d%H%M%S'), self.context['request'].user.id, randint(1000, 9999))

    def validate(self, attrs):
        attrs['order_sn'] = self.generate_order_sn()
        return attrs

    class Meta:
        model = OrderInfo
        fields = '__all__'

定义视图如下：

class OrderViewSet(mixins.CreateModelMixin, mixins.ListModelMixin, mixins.DestroyModelMixin, viewsets.GenericViewSet):
    '''
    订单管理
    list:
        订单列表
    delete:
        删除订单
    create:
        新增订单
    '''

    permission_classes = [IsAuthenticated, IsOwnerOrReadOnly]
    authentication_classes = [JSONWebTokenAuthentication, SessionAuthentication]
    serializer_class = OrderSerializer

    def get_queryset(self):
        return OrderInfo.objects.filter(user=self.request.user, is_delete=False)

    def perform_create(self, serializer):
        order = serializer.save()
        shop_carts = ShoppingCart.objects.filter(user=self.request.user, is_delete=False)
        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()
            shop_cart.delete()
        return order

因为订单一般不允许修改，因此不需要继承自UpdateModelMixin。

配置路由如下：

# 配置下订单路由
router.register(r'orders', OrderViewSet, basename='orders')

现进行接口测试如下：

显然，可以获取、添加和删除订单。

2.Vue接入订单接口

需要完善订单详情，新建序列化如下：

class OrderGoodsSerializer(serializers.ModelSerializer):
    goods = GoodsSerializer(many=False)

    class Meta:
        model = OrderGoods
        fields = '__all__'


class OrderDetailSerializer(serializers.ModelSerializer):
    goods = OrderGoodsSerializer(many=True)

    class Meta:
        model = OrderInfo
        fields = '__all__'

视图完善如下：

class OrderViewSet(mixins.CreateModelMixin, mixins.ListModelMixin, mixins.RetrieveModelMixin, mixins.DestroyModelMixin, viewsets.GenericViewSet):
    '''
    订单管理
    list:
        订单列表
    delete:
        删除订单
    create:
        新增订单
    '''

    permission_classes = [IsAuthenticated, IsOwnerOrReadOnly]
    authentication_classes = [JSONWebTokenAuthentication, SessionAuthentication]
    serializer_class = OrderSerializer

    def get_queryset(self):
        return OrderInfo.objects.filter(user=self.request.user, is_delete=False)

    def get_serializer_class(self):
        if self.action == 'retrieve':
            return OrderDetailSerializer
        return OrderSerializer

    def perform_create(self, serializer):
        order = serializer.save()
        shop_carts = ShoppingCart.objects.filter(user=self.request.user, is_delete=False)
        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()
            shop_cart.delete()
        return order

查看前端cart.vue如下：

<p class="sumup"><a class="btn" @click="balanceCount">去结算a>p>

balanceCount () { // 结算
    if(this.address==''){
        alert("请选择收货地址")
    }else{
    createOrder(
        {
        post_script:this.post_script,
        address:this.address,
        signer_name:this.signer_name,
        signer_mobile:this.signer_mobile,
        order_mount:this.totalPrice
        }
    ).then((response)=> {
        alert('订单创建成功')
        window.location.href=response.data.alipay_url;
    }).catch(function (error) {
        console.log(error);
    });
    }
},

通过调用balanceCount()方法创建订单，是通过调用createOrder接口实现的。

src/views/member/order.vue如下：

<table width="100%" border="0" cellpadding="5" cellspacing="1" bgcolor="#dddddd">
    <tbody>
        <tr align="center">
            <td bgcolor="#ffffff">订单号td>
            <td bgcolor="#ffffff">下单时间td>
            <td bgcolor="#ffffff">订单总金额td>
            <td bgcolor="#ffffff">订单状态td>
            <td bgcolor="#ffffff">操作td>
        tr>
        <tr v-for="item in orders">
            <td align="center" bgcolor="#ffffff"><a class="f6" @click="goDetail(item.id)">{{item.order_sn}}a>td>
            <td align="center" bgcolor="#ffffff">{{item.add_time}}td>
            <td align="right" bgcolor="#ffffff">￥{{item.order_mount}}元td>
            <td v-if="item.pay_status == 'paying' " align="center" bgcolor="#ffffff">待支付td>
            <td v-if="item.pay_status == 'TRADE_SUCCESS' " align="center" bgcolor="#ffffff">已支付td>
            <td align="center" bgcolor="#ffffff"><font class="f6"><a @click="cancelOrder(item.id)">取消订单a>font>td>
        tr>
    tbody>
table>

created () {
    this.getOrder();
},

getOrder () {
    getOrders().then((response)=> {
        this.orders = response.data;
    }).catch(function (error) {
        console.log(error);
    });
},
cancelOrder (id) {
    alert('您确认要取消该订单吗？取消后此订单将视为无效订单');
    delOrder(id).then((response)=> {
        alert('订单删除成功')
    }).catch(function (error) {
        console.log(error);
    });
},
goDetail (id) {
    this.$router.push({name: 'orderDetail', params: {orderId: id}});
}

初始化时调用getOrder()方法获取订单列表，通过调用getOrders接口实现，再通过for循环显示出来；取消订单调用cancelOrder(id)方法，调用delOrder接口实现；获取订单详情直接调用goDetail(id)方法。

src/views/member/orderDetail.vue如下：

<div class="userCenterBox boxCenterList clearfix" style="_height:1%;">
        <h5><span>订单状态span>h5>
        <div class="blank">div>
        <table width="100%" border="1" cellpadding="5" cellspacing="1" bgcolor="#09C762">
            <tbody>
                <tr>
                    <td width="15%" align="right" bgcolor="#ffffff">订单号：td>
                    <td align="left" bgcolor="#ffffff">{{orderInfo.order_sn}}
                        
                    td>
                tr>
                <tr>
                    <td align="right" bgcolor="#ffffff">订单状态：td>
                    <td v-if="orderInfo.pay_status == 'paying' " align="left" bgcolor="#ffffff">待支付    <div style="text-align:center"><a :href="orderInfo.alipay_url"><input type="button" onclick="" value="立即使用支付宝支付">a>div>td>
                    <td v-if="orderInfo.pay_status == 'TRADE_SUCCESS' " align="left" bgcolor="#ffffff">已支付td>
                tr>
            tbody>
        table>
        <table>table>
    <div class="blank">div>
    <h5>
        <span>商品列表span>
    h5>
    <div class="blank">div>
    <table width="100%" border="1" cellpadding="5" cellspacing="1" bgcolor="#09C762">
        <tbody>
            <tr>
                <th width="30%" align="center" bgcolor="#ffffff">商品名称th>
                
                <th width="19%" align="center" bgcolor="#ffffff">商品价格th>
                <th width="9%" align="center" bgcolor="#ffffff">购买数量th>
                <th width="20%" align="center" bgcolor="#ffffff">小计th>
            tr>
            <tr v-for="item in orderInfo.goods">
                <td bgcolor="#ffffff">
                    <router-link  :to="'/app/home/productDetail/'+item.id" class="f6">{{item.goods.name}}router-link>
                    
                td>
                <td align="center" bgcolor="#ffffff">￥{{item.goods.shop_price}}元td>
                <td align="center" bgcolor="#ffffff">{{item.goods_num}}td>
                <td align="center" bgcolor="#ffffff">￥{{item.goods.shop_price*item.goods_num}}元td>
            tr>
            <tr>
                <td colspan="8" bgcolor="#ffffff" align="right">
                    商品总价: ￥{{totalPrice}}元
                td>
            tr>
        tbody>
    table>
    <div class="blank">div>
    <div class="blank">div>
    <h5><span>收货人信息span>h5>
    <div class="blank">div>
    <form name="formAddress" id="formAddress">
        <table width="100%" border="0" cellpadding="5" cellspacing="1" bgcolor="#09C762">
            <tbody>
            <tr>
                <td width="15%" align="right" bgcolor="#ffffff">收货人姓名： td>
                <td width="35%" align="left" bgcolor="#ffffff"><input name="consignee" type="text" class="inputBg" v-model="orderInfo.signer_name" size="25">
                td>
                <td width="15%" align="right" bgcolor="#ffffff">收货地址： td>
                <td width="35%" align="left" bgcolor="#ffffff"><input name="email" type="text" class="inputBg" v-model="orderInfo.address" size="25">
                td>
            tr>

            <tr>
                <td align="right" bgcolor="#ffffff">电话： td>
                <td align="left" bgcolor="#ffffff"><input name="address" type="text" class="inputBg" v-model="orderInfo.signer_mobile" size="25">td>
            tr>
        tbody>
    table>
form>

created () {
    this.orderId = this.$route.params.orderId;
    this.getOrderInfo();
    this.getReceiveByOrderId();
},

getProList () { //根据订单号获取商品列表


},
getOrderInfo () { //获取订单信息
    getOrderDetail(this.orderId).then((response)=> {
        this.orderInfo = response.data;
        var totalPrice = 0
        response.data.goods.forEach(function(entry) {
            totalPrice += entry.goods_num*entry.goods.shop_price
        });
        this.totalPrice = totalPrice

    }).catch(function (error) {
        console.log(error);
    });

},
getReceiveByOrderId () { //通过orderid找收货人信息

    this.$http.post('/order/receiveInfo', {
        params: {
            orderId: this.orderId
        }
    }).then((response)=> {


        this.receiveData = response.data;
    }).catch(function (error) {
        console.log(error);
    });

},
updateReceiveInfo () { //更新收货人信息
    this.$http.post('/order/updateReceiveInfo', {
        data: {
            receiveInfo: this.receiveData
        }
    }).then((response)=> {
        alert('更新成功');

    }).catch(function (error) {
        console.log(error);
    });
}

初始化时调用getOrderInfo()和getReceiveByOrderId()方法：
getOrderInfo()方法获取订单信息，通过getOrderDetail接口实现；getProList()方法获取订单中的商品列表；getReceiveByOrderId()方法获取收货人信息。

api.js中接口修改如下：

//获取订单
export const getOrders = () => { return axios.get(`${local_host}/orders/`) }
//删除订单
export const delOrder = orderId => { return axios.delete(`${local_host}/orders/`+orderId+'/') }
//添加订单
export const createOrder = params => {return axios.post(`${local_host}/orders/`, params)}
//获取订单详情
export const getOrderDetail = orderId => {return axios.get(`${local_host}/orders/`+orderId+'/')}

创建订单示意如下：

查看如下：

显然，创建和查看订单信息均实现。

三、支付宝支付接口完成

1.支付宝公钥、私钥生成和沙箱环境配置

要接入支付宝支付需要在支付宝开放平台https://openhome.alipay.com/platform/home.htm登录并进行验证。

因为对个人开发者不能开放，因此只能进行沙箱环境测试，地址为https://openhome.alipay.com/platform/appDaily.htm?tab=info，此时可以看到APPID、支付宝网关和RSA2(SHA256)密钥，如下：

首先需要下载支付宝开发平台开发助手生成应用公钥和应用私钥，可以点击https://download.csdn.net/download/CUFEECR/12680902或https://ideservice.alipay.com/ide/getPluginUrl.htm?clientType=assistant&platform=win&channelType=WEB下载后安装按照以下示意生成应用公钥和私钥：

然后将生成的公钥复制，在https://openhome.alipay.com/platform/appDaily.htm?tab=info中点击设置生成应用公钥和支付宝公钥，将应用公钥、应用私钥和支付宝公钥都按照固定格式分别保存到app_public.txt、app_private.txt和ali_public.txt中，如下：

-----BEGIN PRIVATE KEY-----
MIIBIjxxxxxxIDAQAB
-----END PRIVATE KEY-----

其中中间部分对应着公钥或私钥，并将这3个文件保存到apps/trade/keys目录下。

2.支付宝开发文档

在支付宝开发文档https://opendocs.alipay.com/apis中有很多API接口，这里主要用到支付类API的统一收单下单并支付页面接口，地址为https://opendocs.alipay.com/apis/api_1/alipay.trade.page.pay，请求地址为https://openapi.alipay.com/gateway.do，包含公共参数、请求参数、公共参数等，这里只需要用到公共请求参数中的必填参数即可。

在公共请求参数中，大部分的参数已经获取到或为固定值，比较重要的两个为sign和biz_content，其中sign是商户请求参数的签名串，biz_content是请求参数的集合，最大长度不限，除公共参数外所有请求参数都必须放在这个参数中传递；在请求参数中，out_trade_no、product_code、total_amount和subject为必填参数，其他均为选填，可根据需要填写。

sign参数即签名，需要专门生成，可参考https://opendocs.alipay.com/open/291/105974，这里选择普通公钥方式生成签名，可以使用开放平台SDK接入，也可以未使用开放平台SDK、自行实现签名过程，还可以直接使用支付宝开放平台开发助手的签名功能。

这里先选择自行实现签名，以便了解签名的生成过程，可查看https://opendocs.alipay.com/open/291/106118，需要对参数进行筛选并排序、拼接，再请求，在apps/utils下新建ali_sign_self.py如下：

from datetime import datetime
from Crypto.PublicKey import RSA
from Crypto.Signature import PKCS1_v1_5
from Crypto.Hash import SHA256
from urllib.parse import quote_plus
from urllib.parse import urlparse, parse_qs
from base64 import decodebytes, encodebytes

import json


class AliPay(object):
    """
    支付宝支付接口
    """
    def __init__(self, appid, app_private_key_path,
                 alipay_public_key_path, app_notify_url=None, return_url=None, debug=False):
        self.appid = appid
        self.app_notify_url = app_notify_url
        self.app_private_key_path = app_private_key_path
        self.app_private_key = app_notify_url
        self.return_url = return_url
        with open(self.app_private_key_path) as fp:
            self.app_private_key = RSA.importKey(fp.read())

        self.alipay_public_key_path = alipay_public_key_path
        with open(self.alipay_public_key_path) as fp:
            self.alipay_public_key = RSA.import_key(fp.read())


        if debug is True:
            self.__gateway = "https://openapi.alipaydev.com/gateway.do"
        else:
            self.__gateway = "https://openapi.alipay.com/gateway.do"

    def direct_pay(self, subject, out_trade_no, total_amount, return_url=None, **kwargs):
        biz_content = {
            "subject": subject,
            "out_trade_no": out_trade_no,
            "total_amount": total_amount,
            "product_code": "FAST_INSTANT_TRADE_PAY",
            # "qr_pay_mode":4
        }

        biz_content.update(kwargs)
        data = self.build_body("alipay.trade.page.pay", biz_content, self.return_url)
        return self.sign_data(data)

    def build_body(self, method, biz_content, return_url=None):
        data = {
            "app_id": self.appid,
            "method": method,
            "charset": "utf-8",
            "sign_type": "RSA2",
            "timestamp": datetime.now().strftime("%Y-%m-%d %H:%M:%S"),
            "version": "1.0",
            "biz_content": biz_content
        }

        if return_url is not None:
            data["notify_url"] = self.app_notify_url
            data["return_url"] = self.return_url

        return data

    def sign_data(self, data):
        data.pop("sign", None)
        # 排序后的字符串
        unsigned_items = self.ordered_data(data)
        unsigned_string = "&".join("{0}={1}".format(k, v) for k, v in unsigned_items)
        sign = self.sign(unsigned_string.encode("utf-8"))
        ordered_items = self.ordered_data(data)
        quoted_string = "&".join("{0}={1}".format(k, quote_plus(v)) for k, v in ordered_items)

        # 获得最终的订单信息字符串
        signed_string = quoted_string + "&sign=" + quote_plus(sign)
        return signed_string

    def ordered_data(self, data):
        complex_keys = []
        for key, value in data.items():
            if isinstance(value, dict):
                complex_keys.append(key)

        # 将字典类型的数据dump出来
        for key in complex_keys:
            data[key] = json.dumps(data[key], separators=(',', ':'))

        return sorted([(k, v) for k, v in data.items()])

    def sign(self, unsigned_string):
        # 开始计算签名
        key = self.app_private_key
        signer = PKCS1_v1_5.new(key)
        print(signer)
        signature = signer.sign(SHA256.new(unsigned_string))
        # base64 编码，转换为unicode表示并移除回车
        sign = encodebytes(signature).decode("utf8").replace("\n", "")
        return sign

    def _verify(self, raw_content, signature):
        # 开始计算签名
        key = self.alipay_public_key
        signer = PKCS1_v1_5.new(key)
        digest = SHA256.new()
        digest.update(raw_content.encode("utf8"))
        if signer.verify(digest, decodebytes(signature.encode("utf8"))):
            return True
        return False

    def verify(self, data, signature):
        if "sign_type" in data:
            sign_type = data.pop("sign_type")
        # 排序后的字符串
        unsigned_items = self.ordered_data(data)
        message = "&".join(u"{}={}".format(k, v) for k, v in unsigned_items)
        return self._verify(message, signature)


if __name__ == "__main__":
    return_url = 'https://openapi.alipaydev.com/gateway.do?app_id=2021000116666333&biz_content=%7B%22subject%22%3A%22%5Cu6d4b%5Cu8bd5%5Cu8ba2%5Cu5355%22%2C%22out_trade_no%22%3A%222020073117084113308%22%2C%22total_amount%22%3A10.01%2C%22product_code%22%3A%22FAST_INSTANT_TRADE_PAY%22%7D&charset=utf-8&method=alipay.trade.page.pay¬ify_url=http%3A%2F%2F127.0.0.1%3A8080%2F&return_url=http%3A%2F%2F123.56.18.248%3A8000%2F&sign_type=RSA2×tamp=2020-08-01+08%3A56%3A07&version=1.0&sign=LuwD5iaqKfLxzcwQswFbuCIwqHg8THta3monZlRQiUkPI8u3MvbXhvSio8WqAvYCsBxnWMss14zzQU1awuJo7OVv%2BDG%2F6hkiO%2BEFlMIkYQzix518tgLgq30O8hfqDWbzch6sSo8RRthldlLHy9KrpWZYCjwSlR1ivFiHS2FGGXjeYxasUfU06LK04fNn%2ForwonJXslqRuUckRVOm56AczkXpuD5Zr3yI%2BOpwYJp4wFCo4tvaYd3qwsqjprGMnUiVWBDlElLJnMtYxf04YKVcDcsBiBTA%2FWffAZZmQv%2FDlyUrbggza1%2FqQZzggVnxtREL%2FYYUCO9enztEpJaVE0SXHw%3D%3D'

    alipay = AliPay(
        appid="2021000116666333",
        app_private_key_path=u"../trade/keys/app_private.txt",
        alipay_public_key_path="../trade/keys/ali_public.txt",  # 支付宝的公钥，验证支付宝回传消息使用，不是你自己的公钥,
        debug=True,  # 默认False,
    )

    o = urlparse(return_url)
    query = parse_qs(o.query)
    processed_query = {}
    ali_sign = query.pop("sign")[0]
    for key, value in query.items():
        processed_query[key] = value[0]
    print (alipay.verify(processed_query, ali_sign))

    url = alipay.direct_pay(
        subject="测试订单",
        out_trade_no="2020073117084113310",
        total_amount=10.01
    )
    re_url = "https://openapi.alipaydev.com/gateway.do?{data}".format(data=url)
    print(re_url)

需要将AliPay初始化的参数换为自己的参数，包括公钥、私钥和appid等。
可以看到需要安装加密使用的依赖库Crypto，直接使用pip install pycryptodome -i https://pypi.douban.com/simple命令安装即可。

运行可以得到签名后的请求地址，例如：

https://openapi.alipaydev.com/gateway.do?app_id=2021000116666333&biz_content=%7B%22subject%22%3A%22%5Cu6d4b%5Cu8bd5%5Cu8ba2%5Cu5355%22%2C%22out_trade_no%22%3A%222020073117084113308%22%2C%22total_amount%22%3A10.01%2C%22product_code%22%3A%22FAST_INSTANT_TRADE_PAY%22%7D&charset=utf-8&method=alipay.trade.page.pay¬ify_url=http%3A%2F%2F127.0.0.1%3A8080%2F&return_url=http%3A%2F%2F123.56.18.248%3A8000%2F&sign_type=RSA2×tamp=2020-08-01+08%3A56%3A38&version=1.0&sign=EcVfBzcX%2BBPDUb6Gx9TDAMdlISmctAWVKi1R9Mdpv5bl6kl0GU7N7gUM2K%2FxGe%2F%2BMYFDhBuVfjpc6bQ5kleVvxK4Gt5lhH5SFFK%2BVgUd1ye1cKrocx59sNQlR5W26hHtVzp%2BN5i%2FT5nSIQr%2BaH3eGd892XB71Wj7rbOnElBO4w8tdlNtqa9YwmocC%2FZcvPkpkLHGMgoAFItMOR%2FqChPIeA4Za8s9gPlXRqhqHFe9PYGIQsD26q1ImJpYRLD0mra4G9S2Pioiox4uwFwySsRnEvwxRDdKErx%2BSpmzMFGUmBMYSEMYmG1up70ovx4ibPRoU5TutWYcwSrClzs632MwwQ%3D%3D

在配置成功的情况下即可使用该链接访问到支付页面。

由于沙箱环境是模拟测试环境，因此不允许使用自己的支付宝支付，需要使用提供的沙箱账号和密码进行支付测试，地址为https://openhome.alipay.com/platform/appDaily.htm?tab=account，还需要在沙箱工具中https://openhome.alipay.com/platform/appDaily.htm?tab=tool下载沙箱版钱包、登录后进行支付。

3.支付宝生成签名源码分析

在初始化AliPay类时，需要传入appid、应用私钥和支付宝公钥等参数，还需要用到app_notify_url和return_url。

direct_pay(subject, out_trade_no, total_amount, return_url=None, **kwargs)方法先生成biz_content，至少应包括4个必填参数，还可以添加可选参数，并调用build_body(method, biz_content, return_url=None)方法来生成完整参数。

build_body(method, biz_content, return_url=None)方法生成请求需要的公共参数，并将biz_content作为参数的一部分，并将两个链接放入data中。

在形成完整地址后，通过sign_data(data)方法对data生成签名，是最重要的部分，先调用ordered_data(data)对data进行排序，然后将其连接成字符串，然后对该字符串调用sign()方法进行签名，sign()方法中先使用SHA256加密，再进行base64编码。

有两个url，app_notify_url和return_url，前者是与支付宝进行异步交互链接，后者是同步接收跳转接口。

在获取到签名后，就可以直接访问付款链接了，示意如下：

显然，已经成功测试付款，这里选择的是通过账号和支付密码进行付款，还可以手机下载沙箱版钱包登录扫码付款。在付款成功后跳转到指定页面。

除了自定义签名生成和链接生成，还可以使用第三方库，如python-alipay-sdk，通过命令pip install python-alipay-sdk -i https://pypi.douban.com/simple安装到虚拟环境即可，然后新建ali_sign_sdk代码如下：

from alipay import AliPay

# 沙箱环境中 app 私钥
app_private_key_string = open('../trade/keys/app_private.txt').read()
# 支付宝公钥
alipay_public_key_string = open( '../trade/keys/ali_public.txt').read()

def get_alipay_url():
    alipay = AliPay(
        appid="2021000116666333",  # 沙箱appid
        app_notify_url=None,  # 默认回调url
        app_private_key_string=app_private_key_string,
        # 支付宝的公钥，验证支付宝回传消息使用，不是你自己的公钥,
        alipay_public_key_string=alipay_public_key_string,
        sign_type="RSA2",  # RSA 或者 RSA2
        debug=True,  # 默认False,我们是沙箱，所以改成True(让访问沙箱环境支付宝地址)
    )
    # 调用支付接口
    # 电脑网站支付，需要跳转到https://openapi.alipay.com/gateway.do? + order_string
    order_string = alipay.api_alipay_trade_page_pay(
        out_trade_no="2020073117084113330",  # 订单id，应该从前端获取
        total_amount=10.01,  # 订单总金额
        subject="测试支付宝付款",  # 付款标题信息,
        return_url='http://127.0.0.1:8080/#/app/home/index'
    )
    pay_url = "https://openapi.alipaydev.com/gateway.do?" + order_string
    print(pay_url)  # 将这个url复制到浏览器，就会打开支付宝支付页面


if __name__ == '__main__':
    get_alipay_url()

效果一样，但是显然代码更加简洁。

从前面可以看到，return_url是支付宝付款成功后直接跳转的页面，回到商家页面后，应该对支付宝返回的数据进行验证，验证部分为：

return_url = 'https://openapi.alipaydev.com/gateway.do?app_id=2021000116666333&biz_content=%7B%22subject%22%3A%22%5Cu6d4b%5Cu8bd5%5Cu8ba2%5Cu5355%22%2C%22out_trade_no%22%3A%222020073117084113310%22%2C%22total_amount%22%3A%2210.01%22%2C%22product_code%22%3A%22FAST_INSTANT_TRADE_PAY%22%7D&charset=utf-8&method=alipay.trade.page.pay&sign_type=RSA2×tamp=2020-08-01+20%3A52%3A55&version=1.0&sign=GMkujrhzKgS%2FTYpUJVcEVcyU9uZ2cQ%2BZApinxSYML1kceQ3NsghC13BnVHOHfP9cT1lGmyKDKA0at7UHhmeIhgMyEPuyb2SG085zkARlkIDKyzTQKVJ7K0QtQH8zenTv3TJEHJUJMWrm5rfXHsympNyF06bvu%2BMdc9TlYVFiexY7fe1c%2FO1pJADx7CSoPhRGQksKIChQ5HVoQxI6NTuaOXjQ%2B7SiJ9Q5qKsrMFtHzOiN5HwAzjljvFn7%2BxNNNnkG0BseTqIXi%2FWryK4v6bsAEE9SfPlNs6FIwvOa3Ve6q90YHmA48p7PcEmH7Mt0KPfhOEclvTIu7ExKoMlpQ7Wk%2Fg%3D%3D'
alipay = AliPay(
    appid="2021000116666333",
    app_private_key_path=u"../trade/keys/app_private.txt",
    alipay_public_key_path="../trade/keys/ali_public.txt",  # 支付宝的公钥，验证支付宝回传消息使用，不是你自己的公钥,
    debug=True,  # 默认False,
)

o = urlparse(return_url)
query = parse_qs(o.query)
print(query)
processed_query = {}
ali_sign = query.pop("sign")[0]
for key, value in query.items():
    processed_query[key] = value[0]
print(processed_query)
print(alipay.verify(processed_query, ali_sign))

如果链接参数未被修改、验证成功，会打印True，否则会打印False。

4.Django集成支付宝renturn_url和notify_url

如果想在支付宝支付成功后跳转页面和返回数据，就需要指定notify_url和renturn_url，其中notify_url的应用范围更广，通过POST方法发送异步请求；renturn_url是通过GET方法同步发送请求。所以可以直接在后端配置一个路由即可实现两种方式的请求发送。

现在apps/trade/views.py中实现支付宝支付视图如下：

class AliPayView(APIView):
    '''
    get:
        处理支付宝return_url请求
    post:
        处理支付宝notify_url请求
    '''

    def get(self, request):
        alipay = AliPay(
            appid=ali_app_id,
            app_notify_url=None,
            app_private_key_string=open(app_private_key_path).read(),
            alipay_public_key_string=open(alipay_public_key_path).read(),
            sign_type="RSA2",
            debug=True,
        )
        data = dict(request.GET.items())
        signature = data.pop("sign", None)
        print(data)
        success = alipay.verify(data, signature)
        print(success)
        trade_status = alipay.api_alipay_trade_query(out_trade_no="2020073117084113309").get("trade_status", None)
        print(trade_status)
        if success and trade_status in ("TRADE_SUCCESS", "TRADE_FINISHED"):
            order_sn = data.get('out_trade_no', None)
            trade_no = data.get('trade_no', None)
            existed_orders = OrderInfo.objects.filter(order_sn=order_sn, is_delete=False)
            if existed_orders:
                for order in existed_orders:
                    order.pay_status = trade_status
                    order.trade_no = trade_no
                    order.pay_time = datetime.now()
                    order.save()
                return Response('success')
        return Response('failed')

    def post(self, request):
        alipay = AliPay(
            appid=ali_app_id,
            app_notify_url=None,
            app_private_key_string=open(app_private_key_path).read(),
            alipay_public_key_string=open(alipay_public_key_path).read(),
            sign_type="RSA2",
            debug=True,
        )
        data = dict(request.POST.items())
        signature = data.pop("sign", None)
        success = alipay.verify(data, signature)
        trade_status = alipay.api_alipay_trade_query(out_trade_no="2020073117084113366").get("trade_status", None)
        if success and trade_status in ("TRADE_SUCCESS", "TRADE_FINISHED"):
            order_sn = data.get('out_trade_no', None)
            trade_no = data.get('trade_no', None)
            existed_orders = OrderInfo.objects.filter(order_sn=order_sn, is_delete=False)
            print(len(existed_orders))
            if existed_orders:
                for order in existed_orders:
                    order.pay_status = trade_status
                    order.trade_no = trade_no
                    order.pay_time = datetime.now()
                    order.save()
                return Response('success')
        return Response('failed')

urls.py中注册路由如下：

# 支付宝结果返回接口
url(r'^alipay/return/', AliPayView.as_view(), name='alipay')

settings.py中配置如下：

# 支付宝相关配置
app_private_key_path = os.path.join(BASE_DIR, 'apps/trade/keys/app_private.txt')
alipay_public_key_path = os.path.join(BASE_DIR, 'apps/trade/keys/ali_public.txt')
ali_app_id = "2021000116666333"
return_url = 'http://127.0.0.1:8000/alipay/return/'
notify_url = 'http://127.0.0.1:8000/alipay/return/'

进行测试如下：

因为测试用的订单号不在数据库中，因此返回failed。

5.支付宝接口前端调试

首先要在后端生成支付宝支付链接，需要在序列化中定义并实现，需要用到serializers提供的SerializerMethodField字段，这是一个只读字段，它通过在附加的序列化器类上调用一个方法来获取其值，可以用于将任何类型的数据添加到对象的序列化表示中。
定义格式为SerializerMethodField(method_name=None)，method_name是要调用的序列化程序上的方法的名称，如果未包括，则默认为get_。method_name参数所对应的序列化程序方法应接受单个参数（除了self之外），该参数是要序列化的对象，它应该返回要包含在对象的序列化表示中的任何内容。

serializers.py完善如下：

class OrderSerializer(serializers.ModelSerializer):
    user = serializers.HiddenField(default=serializers.CurrentUserDefault())
    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)
    is_delete = serializers.BooleanField(read_only=True)
    alipay_url = serializers.SerializerMethodField(read_only=True)

    def get_alipay_url(self, obj):
        # 获取支付宝支付链接
        alipay = AliPay(
            appid=ali_app_id,
            app_notify_url=notify_url,
            app_private_key_string=open(app_private_key_path).read(),
            alipay_public_key_string=open(alipay_public_key_path).read(),
            sign_type="RSA2",
            debug=True,
        )
        order_string = alipay.api_alipay_trade_page_pay(
            out_trade_no=obj.order_sn,
            total_amount=obj.order_mount,
            subject='订单号：%s' % obj.order_sn,
            return_url=return_url,
            notify_url=notify_url
        )
        pay_url = "https://openapi.alipaydev.com/gateway.do?" + order_string
        return pay_url

    def generate_order_sn(self):
        # 生成订单编号
        return '%s%d%d' % (time.strftime('%Y%m%d%H%M%S'), self.context['request'].user.id, randint(1000, 9999))

    def validate(self, attrs):
        attrs['order_sn'] = self.generate_order_sn()
        return attrs

    class Meta:
        model = OrderInfo
        fields = '__all__'


class OrderGoodsSerializer(serializers.ModelSerializer):
    goods = GoodsSerializer(many=False)

    class Meta:
        model = OrderGoods
        fields = '__all__'


class OrderDetailSerializer(serializers.ModelSerializer):
    goods = OrderGoodsSerializer(many=True)
    alipay_url = serializers.SerializerMethodField(read_only=True)

    def get_alipay_url(self, obj):
        # 获取支付宝支付链接
        alipay = AliPay(
            appid=ali_app_id,
            app_notify_url=notify_url,
            app_private_key_string=open(app_private_key_path).read(),
            alipay_public_key_string=open(alipay_public_key_path).read(),
            sign_type="RSA2",
            debug=True,
        )
        order_string = alipay.api_alipay_trade_page_pay(
            out_trade_no=obj.order_sn,
            total_amount=obj.order_mount,
            subject='订单号：%s' % obj.order_sn,
            return_url=return_url,
            notify_url=notify_url
        )
        pay_url = alipay.gateway + '?' + order_string
        return pay_url

    class Meta:
        model = OrderInfo
        fields = '__all__'

进行测试如下：

显然，在创建订单时，即生成支付宝生成链接，并成功支付。

前端，购物车组件中代码为：

balanceCount () { // 结算
    if(this.address==''){
        alert("请选择收货地址")
    }else{
    createOrder(
        {
        post_script:this.post_script,
        address:this.address,
        signer_name:this.signer_name,
        signer_mobile:this.signer_mobile,
        order_mount:this.totalPrice
        }
    ).then((response)=> {
        alert('订单创建成功')
        window.location.href=response.data.alipay_url;
    }).catch(function (error) {
        console.log(error);
    });
    }
},

可以看到，在进行结算时，点击弹框就会跳转到支付宝支付链接，在支付完成后应该跳转回订单页面，因此需要设置return_url，有两种实现思路，一种是在前端通过Vue实现，一种是通过后端实现，即支付完成后进行页面跳转。

views.py修改如下：

class AliPayView(APIView):
    '''
    get:
        处理支付宝return_url请求
    post:
        处理支付宝notify_url请求
    '''

    def get(self, request):
        alipay = AliPay(
            appid=ali_app_id,
            app_notify_url=None,
            app_private_key_string=open(app_private_key_path).read(),
            alipay_public_key_string=open(alipay_public_key_path).read(),
            sign_type="RSA2",
            debug=True,
        )
        data = dict(request.GET.items())
        signature = data.pop("sign", None)
        print(data)
        success = alipay.verify(data, signature)
        order_sn = data.get('out_trade_no', None)
        print(success)
        trade_status = alipay.api_alipay_trade_query(out_trade_no=order_sn).get("trade_status", None)
        print(trade_status)
        if success and trade_status in ("TRADE_SUCCESS", "TRADE_FINISHED"):
            trade_no = data.get('trade_no', None)
            existed_orders = OrderInfo.objects.filter(order_sn=order_sn, is_delete=False)
            if existed_orders:
                for order in existed_orders:
                    order.pay_status = trade_status
                    order.trade_no = trade_no
                    order.pay_time = datetime.now()
                    order.save()
                response = HttpResponseRedirect('http://127.0.0.1:8080/#/app/home/member/order')
                response.set_cookie('nextPath', 'pay', max_age=2)
                print('cookie', response.cookies)
                return response
        return HttpResponseRedirect('http://127.0.0.1:8080/#/app/shoppingcart/cart')

    def post(self, request):
        alipay = AliPay(
            appid=ali_app_id,
            app_notify_url=None,
            app_private_key_string=open(app_private_key_path).read(),
            alipay_public_key_string=open(alipay_public_key_path).read(),
            sign_type="RSA2",
            debug=True,
        )
        data = dict(request.POST.items())
        signature = data.pop("sign", None)
        success = alipay.verify(data, signature)
        trade_status = alipay.api_alipay_trade_query(out_trade_no="2020073117084113366").get("trade_status", None)
        if success and trade_status in ("TRADE_SUCCESS", "TRADE_FINISHED"):
            order_sn = data.get('out_trade_no', None)
            trade_no = data.get('trade_no', None)
            existed_orders = OrderInfo.objects.filter(order_sn=order_sn, is_delete=False)
            print(len(existed_orders))
            if existed_orders:
                for order in existed_orders:
                    order.pay_status = trade_status
                    order.trade_no = trade_no
                    order.pay_time = datetime.now()
                    order.save()
                response = HttpResponseRedirect('http://127.0.0.1:8080/#/app/home/member/order')
                response.set_cookie('nextPath', 'pay', max_age=2)
                print('cookie', response.cookies)
                return response
        return HttpResponseRedirect('http://127.0.0.1:8080/#/app/shoppingcart/cart')

演示如下：

显然，已经实现支付的过程，并且在支付完成后跳转回订单页面。