qhfl-6 购物车
购物车中心
用户点击价格策略加入购物车，个人中心可以查看自己所有购物车中数据
在购物车中可以删除课程，还可以更新购物车中课程的价格策略
所以接口应该有四种请求方式， get，post，patch，delete
购物车是属于中间状态数据,而且很多时候需要过期时间,所以我们选择redis
读取速度快,并且redis可以做持久化,支持的数据类型也比较多。
要点：将购物车数据组织放到reids中，reids的增删改查对应http的四种请求方法 。对购物车操作前需验证。
加入购物车接口
# 前端传过来的数据结构
{ course_id , price_policy_id}
# 把购物车数据放入redis中的结构 """ { SHOPPINGCAR_USERID_COURSE_ID: { "id", "title", "course_img", "price_policy_dict": { price_policy_id: "{valid_period, price}" price_policy_id2: "{valid_period, price}" price_policy_id3: "{valid_period, price}" }, "default_price_policy_id": 1 } } """
"""
购物车接口
1010 代表成功
1011 课程不存在
1012 价格策略不存在
1013 获取购物车失败
1014 删除的购物车数据不存在
"""
from rest_framework.views import APIView from rest_framework.response import Response from utils.base_response import BaseResponse from utils.my_auth import LoginAuth from utils.redis_pool import POOL from Course.models import Course import json import redis SHOPPINGCAR_KEY = "SHOPPINGCAR_%s_%s" CONN = redis.Redis(connection_pool=POOL) class ShoppingCarView(APIView): authentication_classes = [LoginAuth, ] def post(self, request): res = BaseResponse() # 1, 获取前端传过来的数据以及user_id course_id = request.data.get("course_id", "") price_policy_id = request.data.get("price_policy_id", "") user_id = request.user.pk # 2, 校验数据的合法性 # 2.1 校验课程id合法性 course_obj = Course.objects.filter(id=course_id).first() if not course_obj: res.code = 1040 res.error = "课程id不合法" return Response(res.dict) # 2.2 校验价格策略id是否合法 price_policy_queryset = course_obj.price_policy.all() price_policy_dict = {} for price_policy in price_policy_queryset: price_policy_dict[price_policy.id] = { "price": price_policy.price, "valid_period": price_policy.valid_period, "valid_period_display": price_policy.get_valid_period_display() } if price_policy_id not in price_policy_dict: res.code = 1041 res.error = "价格策略id不合法" return Response(res.dict) # 3，构建redisKEY key = SHOPPINGCAR_KEY % (user_id, course_id) # 4，构建数据结构 course_info = { "id": course_obj.id, "title": course_obj.title, "course_img": str(course_obj.course_img), "price_policy_dict": json.dumps(price_policy_dict, ensure_ascii=False), "default_price_policy_id": price_policy_id } # 5 写入redis CONN.hmset(key, course_info) res.data = "加入购物车成功" return Response(res.dict)
接口测试
查看购物车接口
def get(self, request): res = BaseResponse() # 1, 拼接redis key user_id = request.user.pk shopping_car_key = SHOPPINGCAR_KEY % (user_id, "*") # 购物车可能 # 2, 去redis中读取数据 # 2.1 匹配所有的keys # 3，构建数据结构展示 all_keys = CONN.scan_iter(shopping_car_key) # redis 扫描相似的 ret = [] for key in all_keys: ret.append(CONN.hgetall(key)) res.data = ret return Response(res.dict)
更新购物车
更新购物车中课程的价格策略
PUT以及DELETE接口
def put(self, request): # 前端 course_id price_policy_id res = BaseResponse() # 1, 获取前端传过来的数据以及user_id course_id = request.data.get("course_id", "") price_policy_id = request.data.get("price_policy_id", "") user_id = request.user.pk # 2, 校验数据的合法性 # 2.1 course_id是否合法 key = SHOPPINGCAR_KEY % (user_id, course_id) if not CONN.exists(key): res.code = 1043 res.error = "课程id不合法" return Response(res.dict) # 2,2 price_policy_id是否合法 price_policy_dict = json.loads(CONN.hget(key, "price_policy_dict")) print(price_policy_dict) if str(price_policy_id) not in price_policy_dict: res.code = 1044 res.error = "价格策略不合法" return Response(res.dict) # 3, 更新redis default_price_policy_id CONN.hset(key, "default_price_policy_id", price_policy_id) res.data = "更新成功" return Response(res.dict)
删除购物车的课程
这里可能是一到多个课程，因此将课程id存到一个列表里面
def delete(self, request): # course_list = [course_id, ] res = BaseResponse() # 1 获取前端传来的数据以及user_id course_list = request.data.get("course_list", "") user_id = request.user.pk # 2 校验course_id是否合法 for course_id in course_list: key = SHOPPINGCAR_KEY % (user_id, course_id) if not CONN.exists(key): res.code = 1045 res.error = "课程ID不合法" return Response(res.dict) # 3， 删除redis数据 CONN.delete(key) res.data = "删除成功" return Response(res.dict)
from django.shortcuts import render from rest_framework.views import APIView from rest_framework.response import Response from utils.base_response import BaseResponse from utils.my_auth import LoginAuth from utils.redis_pool import POOL from Course.models import Course import json import redis # Create your views here. # 前端传过来 course_id price_policy_id # 把购物车数据放入redis """ { SHOPPINGCAR_USERID_COURSE_ID: { "id", "title", "course_img", "price_policy_dict": { price_policy_id: "{valid_period, price}" price_policy_id2: "{valid_period, price}" price_policy_id3: "{valid_period, price}" }, "default_price_policy_id": 1 } } """ SHOPPINGCAR_KEY = "SHOPPINGCAR_%s_%s" CONN = redis.Redis(connection_pool=POOL) class ShoppingCarView(APIView): authentication_classes = [LoginAuth, ] def post(self, request): res = BaseResponse() # 1, 获取前端传过来的数据以及user_id course_id = request.data.get("course_id", "") price_policy_id = request.data.get("price_policy_id", "") user_id = request.user.pk # 2, 校验数据的合法性 # 2.1 校验课程id合法性 course_obj = Course.objects.filter(id=course_id).first() if not course_obj: res.code = 1040 res.error = "课程id不合法" return Response(res.dict) # 2.2 校验价格策略id是否合法 price_policy_queryset = course_obj.price_policy.all() price_policy_dict = {} for price_policy in price_policy_queryset: price_policy_dict[price_policy.id] = { "price": price_policy.price, "valid_period": price_policy.valid_period, "valid_period_display": price_policy.get_valid_period_display() } if price_policy_id not in price_policy_dict: res.code = 1041 res.error = "价格策略id不合法" return Response(res.dict) # 3，构建redisKEY key = SHOPPINGCAR_KEY % (user_id, course_id) # 4，构建数据结构 course_info = { "id": course_obj.id, "title": course_obj.title, "course_img": str(course_obj.course_img), "price_policy_dict": json.dumps(price_policy_dict, ensure_ascii=False), "default_price_policy_id": price_policy_id } # 5 写入redis CONN.hmset(key, course_info) res.data = "加入购物车成功" return Response(res.dict) def get(self, request): res = BaseResponse() # 1, 拼接redis key user_id = request.user.pk shopping_car_key = SHOPPINGCAR_KEY % (user_id, "*") # 2, 去redis中读取数据 # 2.1 匹配所有的keys # 3，构建数据结构展示 all_keys = CONN.scan_iter(shopping_car_key) ret = [] for key in all_keys: ret.append(CONN.hgetall(key)) res.data = ret return Response(res.dict) def put(self, request): # 前端 course_id price_policy_id res = BaseResponse() # 1, 获取前端传过来的数据以及user_id course_id = request.data.get("course_id", "") price_policy_id = request.data.get("price_policy_id", "") user_id = request.user.pk # 2, 校验数据的合法性 # 2.1 course_id是否合法 key = SHOPPINGCAR_KEY % (user_id, course_id) if not CONN.exists(key): res.code = 1043 res.error = "课程id不合法" return Response(res.dict) # 2,2 price_policy_id是否合法 price_policy_dict = json.loads(CONN.hget(key, "price_policy_dict")) print(price_policy_dict) if str(price_policy_id) not in price_policy_dict: res.code = 1044 res.error = "价格策略不合法" return Response(res.dict) # 3, 更新redis default_price_policy_id CONN.hset(key, "default_price_policy_id", price_policy_id) res.data = "更新成功" return Response(res.dict) def delete(self, request): # course_list = [course_id, ] res = BaseResponse() # 1 获取前端传来的数据以及user_id course_list = request.data.get("course_list", "") user_id = request.user.pk # 2 校验course_id是否合法 for course_id in course_list: key = SHOPPINGCAR_KEY % (user_id, course_id) if not CONN.exists(key): res.code = 1045 res.error = "课程ID不合法" return Response(res.dict) # 3， 删除redis数据 CONN.delete(key) res.data = "删除成功" return Response(res.dict)
