DRF学习之商品详情与热卖的实现（十三）

1.商品详情的实现只需让viewset再继承一个mixins.RetrieveModelMixin即可。

class GoodsListViewSet(CacheResponseMixin, mixins.ListModelMixin, mixins.RetrieveModelMixin, viewsets.GenericViewSet):
    """
    商品列表页, 分页， 搜索， 过滤， 排序
    """
    # throttle_classes = (UserRateThrottle, )
    queryset = Goods.objects.all()
    serializer_class = GoodsSerializer
    pagination_class = GoodsPagination
    # authentication_classes = (TokenAuthentication, )
    filter_backends = (DjangoFilterBackend, filters.SearchFilter, filters.OrderingFilter)
    filter_class = GoodsFilter
    search_fields = ('name', 'goods_brief', 'goods_desc')
    ordering_fields = ('sold_num', 'shop_price')

2.配置serializer，因为商品的详情会显示图片所以需要在GoodsSerializer中实例化GoodsImageSerializer，实现序列化GoodsSerializer的同时返回图片的数据信息

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


class GoodsSerializer(serializers.ModelSerializer):
    category = CategorySerializer()
    images = GoodsImageSerializer(many=True)
    class Meta:
        model = Goods
        fields = "__all__"

3.热卖商品接口实现

只需要加一个热卖的过滤器就可以了，在filter中加一个“is_hot”

class GoodsFilter(django_filters.rest_framework.FilterSet):
    """
    商品的过滤类
    """

    pricemin = django_filters.NumberFilter(field_name='shop_price', help_text="最低价格",lookup_expr='gte')
    pricemax = django_filters.NumberFilter(field_name='shop_price', lookup_expr='lte')
    top_category = django_filters.NumberFilter(method='top_category_filter', field_name='category_id', lookup_expr='=')  # 自定义过滤，过滤某个一级分类

    #过滤逻辑
    #类别为1OR2OR3
    def top_category_filter(self, queryset, name, value):
        queryset = queryset.filter(Q(category_id=value) | Q(category__parent_category_id=value) | Q(category__parent_category__parent_category_id=value))
        return queryset


    class Meta:
        model = Goods
        fields = ['pricemin', 'pricemax', 'is_hot', 'is_new']