Overriding save() + site framework = nothing changed when clicking save in the admin

I overrided the save method of one of my model to it sync its sites
with its parent sites:

def save(self, *args, **kwargs):

ret = models.Model.save(self, *args, **kwargs)

if self.id:

for site in self.parent.sites.all():
self.sites.add(site.id)

This code work, except when you save the object in the admin. Using
PDB, I can see that self.parent.sites.all() return something at the
end of send. But right after, the relations disapears. I'm not
(willingly at least) using transactions.

More details here:
http://stackoverflow.com/questions/5982347/why-is-adding-site-to-an-object-doesnt-seem-to-work-in-a-save-override-in-the

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