子对象中的外键过滤器

Question

我有模型：

class Boss(models.Model):
    fullname = models.TextField()

class Shop(models.Model):
    name = models.TextField()
    address = models.TextField()
    phone = models.TextField()
    boss = models.ForeignKey(
        Boss, on_delete=models.CASCADE, related_name="shops"
    )

class Employee(models.Model):
    name = models.TextField()
    phone = models.TextField()
    shop = models.ForeignKey(
        Shop, on_delete=models.CASCADE, related_name="employees"
    )
class WorkSpace(models.Model):
    name = models.TextField()
    employee = models.ForeignKey(
        Shop, on_delete=models.CASCADE, related_name="work_spaces"
    )

序列化程序：

class WorkSpaceSerializer(serializers.ModelSerializer):
    class Meta:
        model = WorkSpace
        fields = ["id","type"]

class EmployeeSerializer(serializers.ModelSerializer):
    work_spaces = WorkSpaceSerializer(many=True, read_only=True)

    class Meta:
        model = Employee
        fields = ["id","work_spaces","name","phone"]

class ShopSerializer(serializers.ModelSerializer):
    employees = EmployeeSerializer(many=True, read_only=True)

    class Meta:
        model = Shop
        fields = ["id","employees","phone","name","address"]

class BossSerializer(serializers.ModelSerializer):
    shops = ShopSerializer(many=True, read_only=True)

    class Meta:
        model = Boss
        fields = ["id","fullname","shops"]

看法

class BossListView(
    ListModelMixin,
    GenericViewSet,
):
    
    queryset = Boss.objects.all()
    serializer_class = BossSerializer
    permission_classes = [IsAuthenticated]

    def get_queryset(self):
        workspace_type = self.request.query_params.get("workspace_type")
        qs = super().get_queryset()
        if workspace_type:
            qs = qs.filter(shops__employees__work_spaces__type=workspace_type.lower()).distinct()
        return qs

我过滤了 Boss.objects.filter(shops__employees__work_spaces__type=C1) 并得到：

{
    "shops": [
        {
            "id": 32,
            "name": "Garden flowers",
            "address": "5 st. Hool-Maa",
            "phone": "879124851861598",
            "employees": [
                {
                    "id": 150,
                    "name": "Mike",
                    "phone": "8154451246",
                    "work_spaces": [
                        {
                            "id": 497,
                            "type": "B12"
                        },
                        {
                            "id": 15,
                            "type": "Z5"
                        },
                        {
                            "id": 33,
                            "type": "C1"
                        }
                    ]
                }
            ]
        }
    ]
}

但我只需要来自 work_spaces 的 C1：

                [{
                  "id": 33,
                  "type": "C1"
                }]

我怎样才能排除其他工作空间来自查询集还是我需要将结果转换为列表然后使用 for 循环进行过滤？可以有很多工作区，我不需要将它们全部显示给用户，我需要有关老板、商店、员工的信息。

Answer 1

您可以尝试使用 C1 周围的引号吗？

像这样 ：

Boss.objects.filter(shops__employees__work_spaces__type="C1")。

否则，您可以分享您的 type 字段的定义吗？

此外，但这只是我的意见，用 built-in 函数的名称来命名属性是个坏主意。在这里，我不会使用“类型”这个词来命名这个属性。