yes, yes, no and yes. Abstract models should inherit form models.Model.
Abstract models should always have a Meta class with abstract=True. The
order matters when it comes to shared functionality. Here's how I would
code those models you had:
class Taggable(models.Model):
tag = models.CharField()
class Meta:
abstract = True
class Visible(models.Model):
visible = models.BooleanField()
class Meta:
abstract = True
class SomeFullModel(Taggable, Visible):
otherfield = models.CharField()
If you override a method on all three of those classes (e.g. the save
method) and in each of them, call super(...).save(), then the order be:
SomeFullModel.save() => Taggable.save() => Visible.save() =>
models.Model.save()
As to how the Meta class is inherited, I'll point you
to https://docs.djangoproject.com/en/1.4/topics/db/models/#meta-inheritance
On Monday, December 31, 2012 8:12:03 AM UTC-5, Mattias Linnap wrote:
>
> Hi all,
>
> I would like to define multiple abstract base models with small set of
> fields each. The "real" models inherit from multiple mixins to add the
> fields.
>
> For example:
> class Taggable(?):
> tag = models.CharField()
> class Visible(?):
> visible = models.BooleanField()
> class SomeFullModel(?, Taggable, Visible):
> otherfield = models.CharField()
>
> With this use case:
> * should the abstract models inherit from models.Model, or be a plain
> Python class inheriting from object?
> * should all or any of the abstract models have a class Meta with
> abstract=True?
> * should the final real model inherit from models.Model (probably
> required if all the mixins are plain classes), or inherit from the
> first mixin that is an abstract model?
> * does the order of the base classes in SomeFullModel matter?
>
> Thanks,
>
> Mattias
>
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