Hi
How can i create filter for active group?
My models:

class ArtGroup(models.Model):
	title = models.CharField(max_length=150)
	active = models.BooleanField()
	def __unicode__(self):
		return self.title

class Art(models.Model):
	title = models.CharField(max_length=150)
	group = models.ForeignKey(ArtGroup)
	text = models.TextField()
	def __unicode__(self):
		return self.title

My admin model:

class ArtAdmin(admin.ModelAdmin):
	search_fields = ['title']
	list_filter = ['group']

This code doesn't works;-/:
method in class Art

def active_groups(self):
	return ArtGroup.objects.filter(active=True)

filter in ArtAdmin:

	list_filter = ['active_groups']