Django Assign M2M after Saving - django

Question

I'm working on a project in Django and I have the following problem:
I have these two classes, Team and Project. When I create one project I want to automatically assign users from the team what was selected when I created the Project to the new project.
I override Project's save method and after the project was created assign users to the project(I did after saving because, before gave me an error). I tried of several ways but none of them works.
Tried by:
self.user.add(*self.team.users.all())
self.save()
And this doesn't work.
Tried iterating:
for uTeam in self.team.users.all():
self.users.add(uTeam)
and doesn't work either.
The only way that work for me is this, but only in the Django Shell:
P = Project.objects.get(pk=1)
T = Team.objects.get(pk=1)
P.user.add(*T.user.all())
P.save()
This is the solution that I have below but doesn't work in Django(gives an infinite loop)
class Team(models.Model):
name = models.CharField(max_length=200,
help_text=_('name of the team'))
user = models.ManyToManyField(settings.AUTH_USER_MODEL,
related_name="members_of_team",
help_text=_('users of the team'),
null=True
)
and more....
class Project(models.Model):
id = models.AutoField(primary_key=True, null=False)
name = models.CharField(max_length=200,
help_text=_('name of project'),
)
team = models.ForeignKey(Team,`enter code here`
on_delete=models.PROTECT,
help_text=_('team of project'))
created_by = models.ForeignKey(settings.AUTH_USER_MODEL,
on_delete=models.PROTECT,
related_name='creator_project',
blank=True,
null=False,
help_text=_('project created by'))
customer = models.ForeignKey(Customer,
on_delete=models.PROTECT,
help_text=_('customer'))
user = models.ManyToManyField(settings.AUTH_USER_MODEL,
related_name='users_team',
blank=True,
null=False,
help_text=_('users of this project'))
def save(self, *args, **kwargs):
if self.checkIntegrity():
super(Project, self).save(*args, **kwargs)
if self.user.all().count() < self.team.user.all().count():
T = Team.objects.get(pk=self.team.id)
P = Project.objects.get(pk=self.id)
P.user.add(*T.user.all())
P.save()
Thank you for your help

Answer 1

I got it, I read that m2m fields are filled after save() and post_save() and there is a signal that trigger when a m2m field is changed so I write the following:
#receiver(m2m_changed, sender=Project.user.through)
def m2mChange(sender, **kwargs):
instance = kwargs['instance']
T = Team.objects.get(pk=instance.team.id)
if kwargs['pk_set'] is None:
instance.user.add(*T.user.all())
And now it works fine.
Thank you for all.