Hi,
I've recently been working on an open source project to augment the
inheritance of models in Django. This project, called "djeneralize"
allows you to declare specializations on your models and then query
the general case model and get back the specialized instances. A
simple example of the models might be:
class Fruit(BaseGeneralizedModel):
name = models.CharField(max_length=30)
def __unicode__(self):
return self.name
class Apple(Fruit):
radius = models.IntegerField()
class Meta:
specialization = 'apple'
class Banana(Fruit):
curvature = models.DecimalField(max_digits=3, decimal_places=2)
class Meta:
specialization = 'banana'
class Clementine(Fruit):
pips = models.BooleanField(default=True)
class Meta:
specialization = 'clementine'
which then allows the following queries to be executed:
>>> Fruit.objects.all() # what we've got at the moment
[<Fruit: Rosy apple>, <Fruit: Bendy banana>, <Fruit: Sweet
clementine>]
>>> Fruit.specializations.all() # the new stuff!
[<Apple: Rosy apple>, <Banana: Bendy banana>, <Clementine: Sweet
clementine>]
I hope this type of general case/specialization might be of some use
to someone else out there. We're planning on integrating this work in
a large project we're undertaking on content categorization.
Grab the source at github: https://github.com/2degrees/djeneralize
or you can easy_install it (easy_install djeneralize).
Feedback, etc. very welcome.
Thanks, Euan
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