07-商品详情页功能


一、商品详情页功能

1、viewsets实现商品详情页接口

  商品详情页,需要加上mixins.RetrieveModelMixin,因为路由为/goods/id/,因此在之前商品列表页视图中继承详情页类。代码逻辑为:

class GoodsListViewSet(mixins.ListModelMixin,mixins.RetrieveModelMixin,viewsets.GenericViewSet):
    """
    商品列表页 分页 搜索 过滤 排序
    """
    queryset = Goods.objects.all()
    serializer_class = GoodsSerializer
    pagination_class = GoodsSetPagination
    filter_backends = [DjangoFilterBackend,filters.SearchFilter,filters.OrderingFilter]
    #这是精确搜索过滤,我们需要的是模糊搜索
    # filterset_fields = ['name', 'shop_price']
    filter_class = GoodsFilter
    search_fields = ("name","goods_brief","goods_desc")
    ordering_fields = ("shop_price","sold_num","add_time")
goods/serializers.py中的逻辑为:
from rest_framework import serializers

from .models import Goods,GoodsCategory,GoodsImage


class GoodsImageSerializer(serializers.ModelSerializer):
    class Meta:
        model = GoodsImage
        fields = ("image",)


class GoodsSerializer(serializers.ModelSerializer):
    """
    在这里可以利用新写的字段来覆盖已有字段
    """
    category = GoodsCategorySerializer() #在这里实例化外键的序列化器,就可以完成
    images = GoodsImageSerializer(many=True) #名字一定要和related_name="images"中的名字一样
    class Meta:
        model = Goods #指明model
        #fields = ['category', 'goods_sn', 'name', 'click_num','sold_num','fav_num','add_time'] #指明字段
        fields = "__all__" #将全部字段显示出来

这样商品的详情页就完成啦。

 

 2、热卖商品接口实现

数据的模型类中有is_hot这个字段,因此过滤商品的时候我们应该加上is_hot字段。前端的逻辑中,有这个is_hot的条件,因此在过滤器中加上过滤字段为:

import django_filters
from django.db.models import Q

from .models import Goods


class GoodsFilter(django_filters.rest_framework.FilterSet):
    """
    商品过滤器
    """
    pricemin = django_filters.NumberFilter(field_name="shop_price",lookup_expr="gte")
    pricemax = django_filters.NumberFilter(field_name="shop_price", lookup_expr="lte")
    name = django_filters.CharFilter(field_name="name", lookup_expr="icontains")
    #这里过滤的字段要和前端传过来的字段一样
    top_category = django_filters.NumberFilter(method="top_category_filter")

    def top_category_filter(self,queryset,name,value):
        return queryset.filter(Q(category_id=value)|Q(category__parent_category_id=value)|Q(category__parent_category__parent_category_id=value))

    class Meta:
        model = Goods
        fields = ["pricemin","pricemax","name","top_category","is_hot"]

 

 会发现数据没有热销的,因此我们需要去后台管理系统去修改几条数据展示。修改好之后,验证数据。结果出现热搜啦。

 

 3、用户收藏接口实现

用户收藏,是用户操作的,因此需要到user_operation中的视图中操作:

user_operation/views.py:

from django.shortcuts import render
from rest_framework import viewsets
from rest_framework import mixins

from .models import UserFav
from .serializers import UserFavSerializer

# Create your views here.
#添加一条记录, 获取收藏商品列表的功能  删除一条记录  因此继承
class UserFavViewset(mixins.CreateModelMixin,mixins.ListModelMixin,mixins.DestroyModelMixin,viewsets.GenericViewSet):
    """
    用户收藏功能
    """
    queryset = UserFav.objects.all()
    serializer_class = UserFavSerializer

user_operaton/serializers.py:

from rest_framework import serializers
from rest_framework.validators import UniqueTogetherValidator

from .models import UserFav


class UserFavSerializer(serializers.ModelSerializer):
    """
    用户会收藏同一商品多次,因此这是不合理的  所以利用Django的model来实现这一合理操作(也可以下面自己配置)
    """
    user = serializers.HiddenField(
        default=serializers.CurrentUserDefault()
    )
    class Meta:
        model = UserFav
        validators = [
            UniqueTogetherValidator(
                queryset=UserFav.objects.all(),
                fields=['user', 'goods'],
                message="已经收藏"
            )
        ]
        fields = ("user","goods","id")

user_operation/models.pymodel---UserFav中的元类中定义联合索引去重:

class UserFav(models.Model):
    """
    用户收藏
    """
    user = models.ForeignKey(User, verbose_name="用户",on_delete=models.CASCADE)
    goods = models.ForeignKey(Goods, verbose_name="商品", help_text="商品id",on_delete=models.CASCADE)
    add_time = models.DateTimeField(default=datetime.now, verbose_name=u"添加时间")

    class Meta:
        verbose_name = '用户收藏'
        verbose_name_plural = verbose_name
        unique_together = ("user", "goods") #数据库联合索引的认证

 

 完成了收藏功能,以及删除功能。

4、DRF的权限验证

因为上面的操作有一定的问题,任何一个人都可以删除数据库中的收藏,因此DRF官方文档中提供了权限认证

 

 user_operation/views.py

from django.shortcuts import render
from rest_framework import viewsets
from rest_framework import mixins
from rest_framework.permissions import IsAuthenticated
from rest_framework_jwt.authentication import JSONWebTokenAuthentication
from rest_framework.authentication import SessionAuthentication

from utils.permissions import IsOwnerOrReadOnly
from .models import UserFav
from .serializers import UserFavSerializer

# Create your views here.
#添加一条记录, 获取收藏商品列表的功能  删除一条记录  因此继承
class UserFavViewset(mixins.CreateModelMixin,mixins.ListModelMixin,mixins.DestroyModelMixin,viewsets.GenericViewSet):
    """
    用户收藏功能
    """
    # queryset = UserFav.objects.all()
    #配置之后,必须登录才能获取相关操作
    permission_classes = (IsAuthenticated,IsOwnerOrReadOnly)
#因为项目是JWT认证,因此将认证放到具体的认证中,而不是全局设置中 authentication_classes
= (JSONWebTokenAuthentication,SessionAuthentication) serializer_class = UserFavSerializer
lookup_field = "goods_id" #直接可以看商品id查询收藏的,就不用来找收藏的id啦
  #我们只能获取当前用户的UserFav,因此我们要重载get_queryset方法 
def get_queryset(self):
return UserFav.objects.filter(user=self.request.user)

utils/permissions.py:DRF官网permissions提供的权限验证)

from rest_framework import permissions


class IsOwnerOrReadOnly(permissions.BasePermission):
    """
    Object-level permission to only allow owners of an object to edit it.
    Assumes the model instance has an `owner` attribute.
    """

    def has_object_permission(self, request, view, obj):
        # Read permissions are allowed to any request,
        # so we'll always allow GET, HEAD or OPTIONS requests.
        if request.method in permissions.SAFE_METHODS:
            return True

        # Instance must have an attribute named `owner`.
        return obj.user == request.user

MxShop/settings.py:

#配置用户认证,将JSONWebTokenAuthentication拿到具体用户操作认证,不然常规的商品列表页都不能访问
REST_FRAMEWORK = {
    'DEFAULT_AUTHENTICATION_CLASSES': [
        # 'rest_framework_jwt.authentication.JSONWebTokenAuthentication',
        'rest_framework.authentication.BasicAuthentication',
        'rest_framework.authentication.SessionAuthentication',
        'rest_framework.authentication.TokenAuthentication',
    ]
}

 

 

 

 

 

 

 

 

 

 

 整个用户的收藏以及取消收藏功能开发完成。

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