On Wed, May 20, 2009 at 12:57 PM, Adam Olsen <arol...@gmail.com> wrote:
>
> I'm trying to make a tagging application. I want to have tags that
> have related tags, ie, if they choose the tag 'car', it should also
> choose 'automobile'. If they choose 'automobile', it should not
> automatically choose 'car'. I'm using something like:
>
> class Tag(models.Model):
> name = models.CharField(max_length=30)
> related = models.ManyToManyField('self')
>
> If I do this:
>
>>>> car = Tag(name='car')
>>>> car.save()
>>>> automobile = Tag(name='automobile')
>>>> automobile.save()
>>>> car.related.add(automobile)
>>>> car.related.all()
> [<tag: automobile>]
>>>> automobile.related.all()
> [<tag: car>]
>
> How do I make it so that if I add a relation of 'automobile' to 'car',
> it doesn't automatically add a reverse relation like that?
You're looking for a non-symmetrical m2m relation:
http://docs.djangoproject.com/en/dev/ref/models/fields/#django.db.models.ManyToManyField.symmetrical
Yours
Russ Magee %-)
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