如何在OneToOne序列化器字段上允许空白字段用于DJANGO REST框架API

Question

在发布到我的API端点时，我会在OneToOne字段上获得field is required错误，但是我在我发布的模型的save((方法中创建了OneToOne字段。

我已经尝试设置default=None，null=True和blank=True

设备模型

class Device(models.Model):
    name = models.CharField(max_length=50)
    created = models.DateTimeField(auto_now_add=True, editable=False)
    last_updated = models.DateTimeField(auto_now=True, editable=False)
    brand = models.TextField(max_length=50)
    year_purchased = models.IntegerField()
    serial_number = models.TextField(max_length=100)
    info = models.TextField(max_length=100)
    qrcode = models.ImageField(upload_to='', blank=True, null=True)
    def save(self, **kwargs):
        super(Device, self).save(**kwargs)
        if not self.qrcode:
            self.generate_qrcode()
        if not self.checkouts.exists():
            checkout = Checkout(item=self)
            checkout.save()

结帐模型

class Checkout(models.Model):
    status_choices = (...)
    # Fields
    slug = extension_fields.AutoSlugField(populate_from='item', blank=True)
    created = models.DateTimeField(auto_now_add=True, editable=False)
    last_updated = models.DateTimeField(auto_now=True, editable=False)
    due_back = models.DateField(null=True, blank=True)
    checked_out = models.DateTimeField(blank=True, null=True)
    status = models.CharField(max_length=2, choices=status_choices, default=in_stock)
    # Relationship Fields
    user = models.OneToOneField(
        DeviceUser,
        on_delete=models.CASCADE,
        related_name="checkouts",
        blank=True,
        null=True,
        default=None,
    )
    item = models.OneToOneField(
        Device,
        on_delete=models.CASCADE,
        related_name="checkouts",
        primary_key=True,
        blank=True,
        default=None,
    )

设备Serializer

class DeviceSerializer(serializers.ModelSerializer):
    class Meta:
        model = models.Device
        fields = (
            'pk',
            'name',
            'created',
            'last_updated',
            'brand',
            'year_purchased',
            'serial_number',
            'info',
            'checkouts',
        )

发布http POST http://localhost:8000/main/api/device/ brand=test2 info=123213123 name=test2 serial_number=12321321 year_purchased=12 'Authorization: Token .....'

时

我希望能够确认创建设备，而是得到

"checkouts": [ "This field is required." ]

Answer 1

指定 checkouts 字段到您的 DeviceSerializer serialializer as，

checkouts = serializers.DateTimeField(default=None, source='checkouts.checked_out', read_only=True)

# code sample
class DeviceSerializer(serializers.ModelSerializer):
    checkouts = serializers.DateTimeField(default=None, source='checkouts.checked_out', read_only=True)
    class Meta:
        model = models.Device
        fields = (
            'pk',
            'name',
            'created',
            'last_updated',
            'brand',
            'year_purchased',
            'serial_number',
            'info',
            'checkouts',
        )