Python项目-全选购物车

在购物车页面修改购物车使用局部刷新的效果。
全选购物车接口设计和定义


后端接口定义

class CartsSelectAllView(View):
    """全选购物车"""
    def put(self, request):
        # 接收和校验参数
        # 判断用户是否登录
        user = request.user
        if user.is_authenticated:
            # 用户已登录，操作redis购物车
            pass
        else:
            # 用户未登录，操作cookie购物车
            pass

全选购物车后端逻辑实现
接收和校验参数

class CartsSelectAllView(View):
    """全选购物车"""
    def put(self, request):
        # 接收参数
        json_dict = json.loads(request.body.decode())
        selected = json_dict.get('selected', True)
        # 校验参数
        if selected:
            if not isinstance(selected, bool):
                return http.HttpResponseForbidden('参数selected有误')
        # 判断用户是否登录
        user = request.user
        if user is not None and user.is_authenticated:
            # 用户已登录，操作redis购物车
            pass
        else:
            # 用户已登录，操作cookie购物车
            pass

全选Redis购物车

class CartsSelectAllView(View):
    """全选购物车"""
    def put(self, request):
        # 接收和校验参数
        ......
        # 判断用户是否登录
        user = request.user
        if user is not None and user.is_authenticated:
            # 用户已登录，操作redis购物车
            redis_conn = get_redis_connection('carts')
            cart = redis_conn.hgetall('carts_%s' % user.id)
            sku_id_list = cart.keys()
            if selected:
                # 全选
                redis_conn.sadd('selected_%s' % user.id, *sku_id_list)
            else:
                # 取消全选
                redis_conn.srem('selected_%s' % user.id, *sku_id_list)
            return http.JsonResponse({'code': RETCODE.OK, 'errmsg': '全选购物车成功'})
        else:
            # 用户已登录，操作cookie购物车
            pass

全选cookie购物车

class CartsSelectAllView(View):
    """全选购物车"""
    def put(self, request):
        # 接收和校验参数
        ......
        # 判断用户是否登录
        user = request.user
        if user is not None and user.is_authenticated:
            # 用户已登录，操作redis购物车
            ......
        else:
            # 用户已登录，操作cookie购物车
            cart = request.COOKIES.get('carts')
            response = http.JsonResponse({'code': RETCODE.OK, 'errmsg': '全选购物车成功'})
            if cart is not None:
                cart = pickle.loads(base64.b64decode(cart.encode()))
                for sku_id in cart:
                    cart[sku_id]['selected'] = selected
                cookie_cart = base64.b64encode(pickle.dumps(cart)).decode()
                response.set_cookie('carts', cookie_cart, max_age=constants.CARTS_COOKIE_EXPIRES)
            return response

全选购物车:
carts/ views.py

class CartsSelectAllView(View):
    """购物车全选"""
    def put(self, request):
        # 接收参数
        json_dict = json.loads(request.body.decode())
        selected = json_dict.get('selected')

        # 校验参数
        if selected:
            if not isinstance(selected, bool):
                return http.HttpResponseForbidden('参数selected有误')

        user = request.user
        if user.is_authenticated:
            redis_conn = get_redis_connection('carts')
            # 思路：点击了selected 全选就把所有的sku_id添加到set中，反之全部删除

            # 获取购物车所有的sku_id记录 {b'3': b'1',b'5': b'2'}
            redis_cart = redis_conn.hgetall('cart_%s' % user.id)

            redis_sku_ids = redis_cart.keys()

            if selected:
                for redis_sku_id in redis_sku_ids:
                    redis_conn.sadd('selected_%s' % user.id, redis_sku_id)
            else:
                for redis_sku_id in redis_sku_ids:
                    redis_conn.srem('selected_%s' % user.id, redis_sku_id)

            return http.JsonResponse({'code': RETCODE.OK, 'errmsg': 'OK'})

        else:
            # 用户未登录
            cart_str = request.COOKIES.get('carts')

            response = http.JsonResponse({'code': RETCODE.OK, 'errmsg': 'ok'})
            if cart_str and cart_str != 'gAN9cQAu':
                # 转成bytes类型字符串
                cart_str_bytes = cart_str.encode()
                # 转成bytes类型的字典
                cart_dict_bytes = base64.b64decode(cart_str_bytes)
                # 转成真正的字典
                cart_dict = pickle.loads(cart_dict_bytes)

                # cart_dict = {'1': {'count': 10, 'selected': True}, '2': {'count': 20, 'selected': False}}
                # 思路：根据上面验证selected的状态来修改cart_dict里的数据，如果传的是True,全都是True,反之为False 这又是一个循环操作

                for sku_id in cart_dict:
                    cart_dict[sku_id]['selected'] = selected

                cart_dict_bytes = pickle.dumps(cart_dict)
                cart_str_bytes = base64.b64encode(cart_dict_bytes)
                cookie_cart_str = cart_str_bytes.decode()


                # 将新的购物车记录写入到购物车
                response.set_cookie('carts', cookie_cart_str)

            return response

urls.py

# @Time:2021/3/30 19:51
# @Author:Ellen
# @File:urls.py
from django.urls import path, re_path
from . import views

app_name = 'carts'

urlpatterns = [
    # 购物车
    path('carts/', views.CartsView.as_view(), name='info'),
    # 购物车全选
    path('carts/selection/', views.CartsSelectAllView.as_view())
]