Django 1.1.1, need custom validation dependent on other fields
I have 3 models in a Django app, each one has a "hostname" field. For several reasons, these are tracked in different models:
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开发者_StackOverflow社区=45, unique=True, help_text="Name associated with this Virtual IP", verbose_name="name")
...
How can I set up for validation to make sure hostname fields aren't duplicated across any of the 3 models?
I've looked at http://docs.djangoproject.com/en/dev/ref/validators/#ref-validators, but I'm not sure if that's the right path or not. Especially with creating objects from other classes inside a function, etc.
You could use Model Inheritance. Like so:
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)
Don't define BaseDevice as abstract
Model.
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