Hello,
thank you for the fast reply. This is what I am looking for. I know I
had to add the fields redundantly, but the function is defined once
now.
~Bernd
On Jan 6, 1:30 pm, Nikolaus Schlemm <[EMAIL PROTECTED]> wrote:
> 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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