django 商品及购物车逻辑实现

基于类视图模式实现商品分类菜单接口开发

创建菜单子应用

python manage.py startapp menu

测试

apps/menu/views

from django.http import HttpResponse
from django.views import Viewclass GoodsMainMenu(View):def get(self,request):print("get请求")return HttpResponse("get 请求")def post(self,request):print("post请求")return HttpResponse("post 请求")

muxi_shop_back/urls

path("main_menu/", GoodsMainMenu.as_view()),

这时候测试请求
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setting
把csrf中间件注释了

MIDDLEWARE = ["django.middleware.security.SecurityMiddleware","django.contrib.sessions.middleware.SessionMiddleware","django.middleware.common.CommonMiddleware",# "django.middleware.csrf.CsrfViewMiddleware","django.contrib.auth.middleware.AuthenticationMiddleware","django.contrib.messages.middleware.MessageMiddleware","django.middleware.clickjacking.XFrameOptionsMiddleware",
]

接近cors跨域问题

# 解决跨域的一个插件
# pip install django-cors-headers
# 允许所有域名跨域
CORS_ORIGIN_ALLOW_ALL=True
# 允许携带cookie
CORS_ALLOW_CREDENTIALS=True

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解决办法
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获取一级菜单列表
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获取二级菜单列表

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封装统一的返回格式
utils/ResponseMessage

import jsonfrom django.http import HttpResponse, JsonResponse# 我们的菜单成功了状态码就是1000
# 失败了就是1001
# 其它不确定的1002
class MenuResponse():@staticmethoddef success(data):result = {"status":1000,"data":data}return HttpResponse(json.dumps(result), content_type = "application/json")@staticmethoddef failed(data):result = {"status": 1001, "data": data}return HttpResponse(json.dumps(result), content_type="application/json")@staticmethoddef other(data):result = {"status": 1002, "data": data}return HttpResponse(json.dumps(result), content_type="application/json")
# 商品的响应全部都是2开头的
class GoodsResponse():@staticmethoddef success(data):result = {"status":2000,"data":data}return HttpResponse(json.dumps(result), content_type = "application/json")@staticmethoddef failed(data):result = {"status": 2001, "data": data}return HttpResponse(json.dumps(result), content_type="application/json")@staticmethoddef other(data):result = {"status": 2002, "data": data}return HttpResponse(json.dumps(result), content_type="application/json")# 购物车的响应全部都是3开头的
class CartResponse():@staticmethoddef success(data):result = {"status":3000,"data":data}return JsonResponse(result,safe=False)@staticmethoddef failed(data):result = {"status": 3001, "data": data}return JsonResponse(result, safe=False)@staticmethoddef other(data):result = {"status": 3002, "data": data}return JsonResponse(result, safe=False)# 用户的响应全部都是4开头的
class UserResponse():@staticmethoddef success(data):result = {"status":4000,"data":data}return JsonResponse(result,safe=False)@staticmethoddef failed(data):result = {"status": 4001, "data": data}return JsonResponse(result, safe=False)@staticmethoddef other(data):result = {"status": 4002, "data": data}return JsonResponse(result, safe=False)

可以修改为
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APIView继承实现商品类型接口开发

鼠标移动到不同的商品类型显示其对应的商品
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goods/models

import decimalfrom django.db import models
import jsonfrom muxi_shop_back.settings import IMAGE_URLclass Goods(models.Model):type_id = models.IntegerField(blank=True, null=True)name = models.CharField(max_length=255, blank=True, null=True)sku_id = models.CharField(max_length=255, blank=True, null=True)target_url = models.CharField(max_length=255, blank=True, null=True)jd_price = models.DecimalField(max_digits=10, decimal_places=2, blank=True, null=True)p_price = models.DecimalField(max_digits=10, decimal_places=2, blank=True, null=True)image = models.CharField(max_length=255, blank=True, null=True)shop_name = models.CharField(max_length=255, blank=True, null=True)shop_id = models.IntegerField(blank=True, null=True)spu_id = models.CharField(max_length=255, blank=True, null=True)mk_price = models.DecimalField(max_digits=10, decimal_places=2, blank=True, null=True)vender_id = models.IntegerField(blank=True, null=True)find = models.IntegerField(blank=True, null=True)create_time = models.DateTimeField(blank=True, null=True)def __str__(self):result = {}result['type_id']=self.type_idresult['name']=self.nameresult['sku_id']=self.sku_idresult['target_url']=self.target_urlresult['jd_price']=self.jd_priceresult['p_price']=self.p_priceresult['image']= IMAGE_URL + self.imageresult['shop_name']=self.shop_nameresult['shop_id']=self.shop_idresult['spu_id']=self.spu_idresult['mk_price']=self.mk_priceresult['vender_id']=self.vender_idresult['find']=self.findreturn json.dumps(result,cls=DecimalEncoder, ensure_ascii=False)class Meta:managed = Falsedb_table = 'goods'class DecimalEncoder(json.JSONEncoder):def default(self, o):if isinstance(o,decimal.Decimal):return float(o)

goods/urls

from django.urls import pathfrom .views import GoodsCategoryAPIViewurlpatterns = [path("category/<int:category_id>/<int:page>",GoodsCategoryAPIView.as_view()),]

goods/views

from rest_framework.views import APIView# APIView 继承了View
# 获取商品分类的接口
#访问方式 http://localhost:8000/goods/category/1
from apps.goods.models import Goods
from utils import ResponseMessageclass GoodsCategoryAPIView(APIView):def get(self,request,category_id,page):current_page = (page-1)*20end_data = page*20category_data = Goods.objects.filter(type_id=category_id).all()[current_page:end_data]result_list=[]for m in category_data:result_list.append(m.__str__())return ResponseMessage.GoodsResponse.success(result_list)

urls

from django.contrib import admin
from django.urls import path, includefrom apps.menu.views import GoodsMainMenu,GoodsSubMenuurlpatterns = [path("admin/", admin.site.urls),path("main_menu/", GoodsMainMenu.as_view()),path("sub_menu/", GoodsSubMenu.as_view()),path("goods/",include("goods.urls"))
]

setting

# 静态文件服务器配置
IMAGE_URL = "http://localhost:8000/static/product_images/"

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序列化起实现商品详情数据查询接口

使用商品表的su_id 查询
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在商品分类中任意点击一个商品进入就能看到该商品的商品详情

goods/views.py

class GoodsDetailAPIView(APIView):def get(self,request,sku_id):print(sku_id)goods_data = Goods.objects.filter(sku_id=sku_id).first()# 进行序列化的动作 序列化的参数时instance， 反序列化的参数就是dataresult = GoodsSerializer(instance=goods_data)return ResponseMessage.GoodsResponse.success(result.data)

goods/urls

path("<str:sku_id>",GoodsDetailAPIView.as_view()),

goods/serializers.py

from rest_framework import serializers
from apps.goods.models import Goods
from muxi_shop_back.settings import IMAGE_URLclass GoodsSerializer(serializers.ModelSerializer):# 这里边写的字段就是你想要进行序列化时处理的字段# name = serializers.CharField()# 对序列化中的图片做处理image = serializers.SerializerMethodField()# 对序列化中的日期做处理create_time = serializers.DateTimeField("%Y-%m-%d %H:%M:%S")# 自动调用该方法  把 new_image_path 赋值给image   比如给序列化字段image做处理image前面加getdef get_image(self,obj):new_image_path = IMAGE_URL + obj.imagereturn new_image_pathclass Meta:model = Goodsfields = "__all__"

不知道该序列化什么
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    class Meta:# 指定序列化的类model = Goods# 序列化所有的字段fields = "__all__"

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1，2两种序列化都可以实现数据的返回

购物车接口开发–实现数据的添加

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cart/views

from django.http import HttpResponsefrom rest_framework.views import APIView
from apps.cart.models import Cart
from apps.cart.serializers import CartSerializer
class CartAPIView(APIView):# 购物车应该登录之后才能访问def post(self,request):request_data = request.dataemail = request_data.get("email")sku_id = request_data.get('sku_id')nums = request_data.get('nums')# 判断数据是否存在  如果存在就更新，如果不存在就插入data_exists = Cart.objects.filter(email=email,is_delete = 0,sku_id=sku_id)# 存在即更新if data_exists.exists():exists_cart_data = data_exists.get(email=email,is_delete = 0,sku_id=sku_id)new_nums = nums + exists_cart_data.numsrequest_data["nums"] = new_nums# 反序列化  json转对象cart_ser = CartSerializer(data=request_data)cart_ser.is_valid(raise_exception=True)# 更新Cart.objects.filter(email=email, is_delete=0, sku_id=sku_id).update(**cart_ser.data)return ResponseMessage.CartResponse.success("更新成功")else:# 不存在插入cart_ser = CartSerializer(data=request_data)cart_ser.is_valid(raise_exception=True)Cart.objects.create(**cart_ser.data)return ResponseMessage.CartResponse.success("插入成功")

cart/urls

from django.urls import path
from .views import CartAPIViewurlpatterns = [path("",CartAPIView.as_view()),]

cart/serializers.py

from rest_framework import serializersfrom apps.cart.models import Cartclass CartSerializer(serializers.ModelSerializer):sku_id = serializers.CharField(required=True)# email本身设置的是唯一的  所以这里重新设置一下覆盖掉email = serializers.CharField(required=True)class Meta:model = Cartfields = "__all__"

cart/models

from django.db import models# Create your models here.
class Cart(models.Model):id = models.AutoField(primary_key=True,null=False,unique=True)email =  models.CharField(null=False,max_length=255,unique=True)sku_id = models.CharField(null=False,max_length=255,unique=True)nums = models.IntegerField()is_delete = models.IntegerField()class Meta:db_table="shopping_cart"

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购物车接口开发数据的查询

cart/views

    def get(self, request):email = request.GET.get("email")cart_result = Cart.objects.filter(email=email,is_delete=0)# many=True 返回多条cart_ser = CartSerializer(instance=cart_result,many=True)# return JsonResponse(cart_ser.data,safe=False)return ResponseMessage.CartResponse.success(cart_ser.data)

购物车查询接口Bug修复及数据逻辑删除

cart/views

class CartAPIView(APIView):# 购物车应该登录之后才能访问def post(self, request):request_data = request.dataemail = request_data.get("email")sku_id = request_data.get('sku_id')nums = request_data.get('nums')is_delete = request_data.get('is_delete')# 判断数据是否存在  如果存在就更新，如果不存在就插入data_exists = Cart.objects.filter(email=email, is_delete=0, sku_id=sku_id)# 存在即更新if data_exists.exists():exists_cart_data = data_exists.get(email=email, is_delete=0, sku_id=sku_id)if is_delete == 0:new_nums = nums + exists_cart_data.numsrequest_data["nums"] = new_numselif is_delete == 1:new_nums = nums + exists_cart_data.nums# 反序列化  json转对象cart_ser = CartSerializer(data=request_data)cart_ser.is_valid(raise_exception=True)# 更新Cart.objects.filter(email=email, is_delete=0, sku_id=sku_id).update(**cart_ser.data)if is_delete == 0:return ResponseMessage.CartResponse.success("更新成功")elif is_delete == 1:return ResponseMessage.CartResponse.success("删除成功")else:# 不存在插入cart_ser = CartSerializer(data=request_data)cart_ser.is_valid(raise_exception=True)Cart.objects.create(**cart_ser.data)return ResponseMessage.CartResponse.success("插入成功")