查询购物车数据

Posted 2020-12-26 hzlnice

1. 后端接口设计

请求方式 ： GET /cart/

请求参数： 无

返回数据： JSON 或 表单

[
    {
        "id": 9,
        "count": 3,
        "name": "华为 HUAWEI P10 Plus 6GB+64GB 钻雕金 移动联通电信4G手机 双卡双待",
        "default_image_url": "http://image.meiduo.site:8888/group1/M00/00/02/CtM3BVrRcUeAHp9pAARfIK95am88523545",
        "price": "3388.00",
        "selected": true
    },
    {
        "id": 12,
        "count": 1,
        "name": "华为 HUAWEI P10 Plus 6GB+64GB 钻雕蓝 移动联通电信4G手机 双卡双待",
        "default_image_url": "http://image.meiduo.site:8888/group1/M00/00/02/CtM3BVrRdICAO_CRAAcPaeOqMpA2024091",
        "price": "3388.00",
        "selected": true
    }
]

参数	类型	是否必须	说明
id	int	是	商品sku id
count	int	是	数量
selected	bool	是	是否勾选，默认勾选
name	str	是	商品名称
default_image_url	str	是	商品默认图片
price	decimal	是	商品单价

2. 后端实现

在carts/serializers.py中创建序列化器

class CartSKUSerializer(serializers.ModelSerializer):
    """
    购物车商品数据序列化器
    """
    count = serializers.IntegerField(label=‘数量‘)
    selected = serializers.BooleanField(label=‘是否勾选‘)

    class Meta:
        model = SKU
        fields = (‘id‘, ‘count‘, ‘name‘, ‘default_image_url‘, ‘price‘, ‘selected‘)

在carts/views.py 中修改视图，增加get方法

class CartView(APIView):
    ...

    def get(self, request):
        """
        获取购物车
        """
        try:
            user = request.user
        except Exception:
            user = None

        if user is not None and user.is_authenticated:
            # 用户已登录，从redis中读取
            redis_conn = get_redis_connection(‘cart‘)
            redis_cart = redis_conn.hgetall(‘cart_%s‘ % user.id)
            redis_cart_selected = redis_conn.smembers(‘cart_selected_%s‘ % user.id)
            cart = {}
            for sku_id, count in redis_cart.items():
                cart[int(sku_id)] = {
                    ‘count‘: int(count),
                    ‘selected‘: sku_id in redis_cart_selected
                }
        else:
            # 用户未登录，从cookie中读取
            cart = request.COOKIES.get(‘cart‘)
            if cart is not None:
                cart = pickle.loads(base64.b64decode(cart.encode()))
            else:
                cart = {}

        # 遍历处理购物车数据
        skus = SKU.objects.filter(id__in=cart.keys())
        for sku in skus:
            sku.count = cart[sku.id][‘count‘]
            sku.selected = cart[sku.id][‘selected‘]

        serializer = CartSKUSerializer(skus, many=True)
        return Response(serializer.data)