请教下， django restframework 做嵌套 JSON，但是二级 JSON 做了 ORM 筛选后显示不全

代码如下

class FoodApiSerializer(serializers.ModelSerializer): image_url = serializers.SerializerMethodField()

class Meta:
    model = Food
    fields = ('foodid', 'name', 'info', 'price', 'stock', 'image_url', 'num', 'status')

# imagefield 序列化以获取完整的 URL
def get_image_url(self, Food):
    request = self.context.get('request')
    request = request['request']
    image_url = Food.image.url
    return request.build_absolute_uri(image_url)

class CategoryApiSerializer(serializers.ModelSerializer):

foods = serializers.SerializerMethodField()

def get_foods(self, obj):
    foods = Food.objects.filter(Q(category=obj.categoryid), Q(status='True'))

    if foods is not None and len(foods) > 0:
        for x in foods:
            return FoodApiSerializer(x, context={"request": self.context}).data
    else:
        return ''

class Meta:
    model = Category
    fields = ('categoryid', 'categoryname', 'foods')
    read_only_fields = ('categoryid', 'categoryname', 'foods')

def create(self, validated_data):
    pass

def update(self, instance, validated_data):
    pass

现在 foods 下面的 json，只能显示一条数据，其他都没有 而且只能用 for 来 return FoodApiSerializer(x, context={"request": self.context}).data 或者 FoodApiSerializer(foods[0], context={"request": self.context}).data return FoodApiSerializer(foods, context={"request": self.context}).data 会报错