Add to database

I have reviewed the document https://docs.djangoproject.com/en/dev/topics/db/queries/
but I can not insert the field users, the models.py table, I try as
follows, is this what was spinning in the other issue, not the
complete code, thanks:

for i in request.POST.getlist('usuarios'):
usuario=User.objects.get(id=i)
Proyectos.usuarios.add(usuario)

And my models.py file it's the next:

class Proyectos(models.Model):
titulo=models.CharField(max_length=100)
creacion=models.DateField(default=datetime.datetime.now)
estado=models.CharField(max_length=30)
objetivo=models.TextField(null=True)
conclusion=models.TextField(null=True)
porcentaje=models.IntegerField()
modificado=models.DateTimeField(default=datetime.datetime.now)
autor=models.IntegerField()
usuarios=models.ManyToManyField(User)
proyectos_rel=models.ManyToManyField("self")
documentos=models.ManyToManyField(Documentos)
class Meta:
db_table='Proyectos'
def __unicode__(self):
return self.titulo

Thanks you

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