DRF学习之轮播图，新品与商品分类显示功能的实现（二十一）

一、轮播图功能的views的实现

class BannerViewset(mixins.ListModelMixin, viewsets.GenericViewSet):
    """
    获取轮播图列表
    """
    queryset = Banner.objects.all().order_by("index")
    serializer_class = BannerSerializer

二、serializer的实现

class BannerSerializer(serializers.ModelSerializer):
    class Meta:
        model = Banner
        fields = "__all__"

三、注册url

#轮播图url
router.register(r'banners', BannerViewset, basename="banners")

四、新品功能的实现，将是否为新品的过滤逻辑加上

五、商品分类显示
外键加上个

反向来取的时候比较方便
1.serializer的实现，需要嵌套与重写，.data是serializer的实例化，为json数据

class IndexCategorySerializer(serializers.ModelSerializer):
    brands = BrandSerializer(many=True)
    goods = serializers.SerializerMethodField()
    sub_cat = CategorySerializer2(many=True)
    ad_goods = serializers.SerializerMethodField()

    def get_ad_goods(self, obj):
        goods_json = {}
        ad_goods = IndexAd.objects.filter(category_id=obj.id, )
        if ad_goods:
            good_ins = ad_goods[0].goods
            goods_json = GoodsSerializer(good_ins, many=False, context={'request': self.context['request']}).data
        return goods_json



    def get_goods(self, obj):
        all_goods = Goods.objects.filter(Q(category_id=obj.id)|Q(category__parent_category_id=obj.id)|Q(category__parent_category__parent_category_id=obj.id))
        goods_serializer = GoodsSerializer(all_goods, many=True, context={'request': self.context['request']})
        return goods_serializer.data

    class Meta:
        model = GoodsCategory
        fields = "__all__"

2.views的实现

class IndexCategoryViewset(mixins.ListModelMixin, viewsets.GenericViewSet):
    """
    首页商品分类数据
    """
    queryset = GoodsCategory.objects.filter(is_tab=True, name__in=["生鲜食品", "酒水饮料"])
    serializer_class = IndexCategorySerializer

3.注册路由

#首页商品系列数据
router.register(r'indexgoods', IndexCategoryViewset, basename="indexgoods")