Django Rest Framework - 非字段错误自定义消息

Question

我查看了this question，但这并不能真正告诉我非字段错误。

我的模特是：

class DeviceContact(models.Model):
    created = models.DateTimeField(auto_now_add=True)
    contact_sid = models.CharField(max_length=75, db_index=True)
    contact_name = models.CharField(max_length=200)
    contact_email = models.CharField(max_length=250, db_index=True)
    contact_type = models.CharField(max_length=200, default='mobile')

    class Meta:
        unique_together = ("contact_sid", "contact_email", "contact_name")


class DeviceContactSerializer(serializers.ModelSerializer):
    class Meta:
        model = DeviceContact
        fields = ('contact_sid', 'contact_name', 'contact_email', 'contact_type')

unique_together 条件失败时如何返回自定义错误消息？

Answer 1

如何重写DeviceContact 的save 方法，拦截异常，然后根据自己的喜好重新抛出？

class MySuperDuperException(Exception):
    pass

class DeviceContact(models.Model):
    [...]

    def save(self, *args, **kwargs):
        try:
            super(DeviceContact,self).save(*args,**kwargs)
        catch DeviceContact.IntegrityError as e:
            throw MySuperDuperException()

Answer 2

当您在模型上设置unique_together 时，序列化程序将自动generate a UniqueTogetherValidator that is used 来检查它们的唯一性。您可以通过查看序列化程序的输出并反省 Django REST 框架自动生成的内容来确认这一点：

print(repr(DeviceContractSerializer()))

然后，您可以更改设置为包含自定义 UniqueTogetherValidator 的 validators，并设置自定义 message 参数。

UniqueTogetherValidator(
    queryset=DeviceContract.objects.all(),
    fields=('contact_sid', 'contact_email', 'contact_name', ),
    message='This was not a unique combination within the system, pick a different one.'
)