如何提供正确的请求正文来序列化 Django 通用外键？

debugcn 发表于 Dev

马迪7

我有一个名为“电话”的通用模型：

(my_project/apps/phones/models.py)

class Phone(Model):
    owner_name = CharField(max_length=50)
    number = CharField(max_length=20)

    content_type = ForeignKey(ContentType, on_delete=CASCADE)
    object_id = PositiveIntegerField()
    phone_object = GenericForeignKey('content_type', 'object_id')

我还有一个名为“客户端”的模型：

(my_project/apps/clients/models.py)

class Client(Model):
    employee = ForeignKey(Employee, on_delete=CASCADE)
    title = CharField(max_length=50)

    phones = GenericRelation(Phone)

我还有一个“客户端”的序列化程序：

(my_project/apps/clients/serializers.py)

class ClientSerializer(ModelSerializer):
    id = IntegerField(read_only=True)
    employee_id = PrimaryKeyRelatedField(queryset=Employee.objects.all(), source='employee', required=True)
    title = CharField(required=True)

我遵循了 drf-documenation ( http://www.django-rest-framework.org/api-guide/relations/#generic-relationships )，据我所知，我需要将自定义类放在同一个文件中，所以这里是我的 clients/serializers.py 看起来像：

(my_project/apps/clients/serializers.py)

class ClientSerializer(ModelSerializer):
    id = IntegerField(read_only=True)
    employee_id = PrimaryKeyRelatedField(queryset=Employee.objects.all(), source='employee', required=True)
    title = CharField(required=True)

class PhoneObjectRelatedField(RelatedField):
    def to_representation(self, value):
        if isinstance(value, Client):
            serializer = ClientSerializer(value)
        else:
            raise Exception('Unexpected type of phone_object')
        return serializer.data

对于我使用 PostMan 的请求，这里是我使用电话号码创建新客户端的请求：

但它什么也没做，可以成功创建新客户端，但它们不包含任何电话号码，请帮助！

拉乌夫

您可以将相关字段添加到序列化程序字段

class ClientSerializer(ModelSerializer):
    id = IntegerField(read_only=True)
    employee_id = PrimaryKeyRelatedField(queryset=Employee.objects.all(), source='employee', required=True)
    title = CharField(required=True)
    phone = PhoneObjectRelatedField()