我在Django应用程序中有3个模型,每个模型都有一个“主机名”字段。由于几个原因,这些是在不同的模型中跟踪:
class device(models.Model):
...
hostname = models.CharField(max_length=45, unique=True, help_text="The hostname for this device")
...
class netdevice(models.Model):
...
hostname = models.CharField(max_length=45, unique=True, help_text="Name Associated with Device", verbose_name="Hostname")
...
class vipdevice(models.Model):
...
hostname = models.CharField(max_length=45, unique=True, help_text="Name associated with this Virtual IP", verbose_name="name")
...
如何设置验证以确保3个模型中的任何一个都不重复主机名字段?
我看过http://docs.djangoproject.com/en/dev/ref/validators/#ref-validators,但我不确定这是不是正确的道路。特别是在函数内部等其他类中创建对象时
答案 0 :(得分:3)
您可以使用Model Inheritance。像这样:
class BaseDevice(models.Model): #edit: introduced a base class
hostname = CharField(max_length=45, unique=True, help_text="The hostname for this device")
class Device(BaseDevice):
pass
class NetDevice(BaseDevice):
#edit: added attribute
tracked_item=models.ForeignKey(SomeItem)
class VipDevice(BaseDevice):
#edit: added attribute
another_tracked_item=models.ForeignKey(SomeOtherItem)
不要将BaseDevice定义为abstract
模型。