Am Sonntag, 6. Januar 2008 13:04:38 schrieb Brot:
> I have a few models which have the same two fields. Based on these
> fields there is always the same function in these models. But this
> violates DRY. Is there another possibility for my function/models
>
> [...]
>
> Model Inheritance isn't supported yet. Is there another way to avoid
> the duplicated code/function?
if you want to reduce the amount of duplicated code, simply create an abstract
class and inherit that in your models like this:
class ValidFromTo(object):
def is_active(self):
return self.valid_from < datetime.now() < self.valid_to
is_active.short_description = 'Active'
is_active.boolean = True
class EventType(models.Model, ValidFromTo):
....
valid_from = models.DateTimeField(default=datetime.now)
valid_to = models.DateTimeField(default=DEF_VALID_TO)
......
class Event(models.Model, ValidFromTo):
....
type = models.ForeignKey(EventType,
limit_choices_to =
{'valid_from__lte': datetime.now,
'valid_to__gte': datetime.now})
valid_from = models.DateTimeField(default=datetime.now)
valid_to = models.DateTimeField(default=DEF_VALID_TO)
......
class Partner(models.Model, ValidFromTo):
....
valid_from = models.DateTimeField(default=datetime.now)
valid_to = models.DateTimeField(default=DEF_VALID_TO)
......
not perfect yet since you still have to add the fields redundantly, but it's a
first step ;)
--
MfG
Nikl
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