序列化 Django 中的单个相关字段

Question

在我的 Django 应用程序中，我从序列化程序获取数据，如下所示：

{
        "id": 98,
        "flows": [
            {
                "id": 99,
                "asked_quantity": 14,
                "alloted_quantity": 14,
                "flow": 1,
                "kit": 1                    #this
            }
        ],
        "transaction_no": 2317,
        "dispatch_date": "2020-07-27T04:42:46.356000Z",
        "is_delivered": false,
        "model": "Rent",
        "driver_name": "__________",
        "driver_number": "__________",
        "lr_number": 0,
        "vehicle_number": "__________",
        "freight_charges": 0,
        "vehicle_type": "Part Load",
        "expected_delivery": "2020-07-27T04:42:46.356000Z",
        "remarks": "0",
        "send_from_warehouse": 1,            #this
        "sales_order": 98,
        "transport_by": 4,
        "owner": 2
    },

Flows 是一个多联字段，我只想从流和 send_from_warehouse 中扩展 kit，但是当我增加深度时，所有相关字段都会扩展。

这是我尝试这样做的方法：

class KSerializer(serializers.ModelSerializer):

    class Meta:
        model = Kit
        fields = "__all__"


class WSerializer(serializers.ModelSerializer):

    class Meta:
        model = Warehouse
        fields = "__all__"


class AFSerializer(serializers.ModelSerializer):
    kit = KSerializer(many=True)

    class Meta:
        model = AllotmentFlow
        fields = "__all__"


class AReportSerializer(serializers.ModelSerializer):

    flows = AFSerializer(many=True)
    send_from_warehouse = serializers.RelatedField(source='warehouse.pk', read_only=True)

    class Meta:
        model = Allotment
        fields = "__all__"

但我收到了错误消息，即“kitsis not serializable andsend_from_warehouse”从 JSON 中消失。 请解释为什么会发生这种情况以及正确的方法是什么

Answer 1

class AFSerializer(serializers.ModelSerializer):

    class Meta:
        model = AllotmentFlow
        fields = "__all__"


class AReportSerializer(serializers.ModelSerializer):

    flows = AFSerializer(many=True)
    send_from_warehouse = serializers.SlugRelatedField(
    read_only=True,
    slug_field='send_from_warehouse'
 )

    class Meta:
        model = Allotment
        fields = "__all__"

我猜这就是你要找的。​​p>