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I have a signal callback in django: @receiver(post_save, sender=MediumCategory) def update_category_descendants(sender, **kwargs): def children_for(category): return MediumCategory.objects.filter(parent=category) def do_update_descendants(category): children = children_for(category) descendants = list() + list(children) for descendants_part in [do_update_descendants(child) for child in children]: descendants += descendants_part category.descendants.clear() for descendant in descendants: if category and not (descendant in category.descendants.all()): category.descendants.add(descendant) category.save() return list(descendants) # call it for update do_update_descendants(None) ...but in the signal handler's body I'm using .save() on the same model MediumCategory . This causes the signal to be dispatched again. How can I disable it? The perfect solution would be a with statement with some 'magic' inside. UPDATE: Here is my final solution, if anyone interested: class MediumCategory(models.Model): name = models.CharField(max_length=100) slug = models.SlugField(blank=True) parent = models.ForeignKey('self', blank=True, null=True) parameters = models.ManyToManyField(AdvertisementDescriptonParameter, blank=True) count_mediums = models.PositiveIntegerField(default=0) count_ads = models.PositiveIntegerField(default=0) descendants = models.ManyToManyField('self', blank=True, null=True) def save(self, *args, **kwargs): self.slug = slugify(self.name) super(MediumCategory, self).save(*args, **kwargs) def __unicode__(self): return unicode(self.name) (...) @rec

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