# python manage.py validate
Error: One or more models did not validate:
concerts.concert: Accessor for m2m field 'musicans' clashes with related m2m
field 'person.concert_set'. Add a related_name argument to the definition
for 'musicans'.
concerts.concert: Accessor for m2m field 'coches' clashes with related m2m
field 'person.concert_set'. Add a related_name argument to the definition
for 'coches'.
OK.
The problems is with the order of the fields, I solve It:
Now, the problem:
models:
from django.db import models
from django.contrib.auth.models import User, UserManager
class instrumentos(models.Model):
nombre = models.CharField(max_length=10)
numero = models.PositiveSmallIntegerField(blank=True, null=True)
def __unicode__(self):
return self.nombre
class samberos(User):
objects = UserManager()
dni = models.CharField(max_length=10, blank=True, null=True)
phone = models.CharField(max_length=9, blank=True, null=True)
movil = models.CharField(max_length=9, blank=True, null=True)
class contactos(models.Model):
name = models.CharField(max_length=30)
phone = models.CharField(max_length=9, blank=True, null=True)
movil = models.CharField(max_length=9, blank=True, null=True)
mail = models.CharField(max_length=30, blank=True, null=True)
def __unicode__(self):
return self.name
class relaciones(models.Model):
sambero = models.ForeignKey(samberos)
instrumento = models.ForeignKey(instrumentos)
def __unicode__(self):
return '%s => %s' % (self.sambero, self.instrumento)
class actuaciones(models.Model):
titulo = models.CharField(max_length=80)
fecha = models.DateTimeField()
descripcion = models.TextField()
lugar = models.CharField(max_length=200)
organizador = models.ManyToManyField(samberos)
samberos = models.ManyToManyField(relaciones, blank=True, null=True)
confirmada = models.BooleanField(default=False)
contacto = models.ManyToManyField(contactos)
coches = models.ManyToManyField(samberos, blank=True, null=True,
related_name='actuaciones_coches')
def __unicode__(self):
return self.titulo
And the solution is to change the order of the fields:
class actuaciones(models.Model):
titulo = models.CharField(max_length=80)
fecha = models.DateTimeField()
descripcion = models.TextField()
lugar = models.CharField(max_length=200)
organizador = models.ManyToManyField(samberos)
coches = models.ManyToManyField(samberos, blank=True, null=True,
related_name='actuaciones_coches')
samberos = models.ManyToManyField(relaciones, blank=True, null=True)
confirmada = models.BooleanField(default=False)
contacto = models.ManyToManyField(contactos)
def __unicode__(self):
return self.titulo
Thank you very much!!!
2008/10/7 Malcolm Tredinnick <[EMAIL PROTECTED]>
>
>
> On Mon, 2008-10-06 at 13:52 -0700, xkill wrote:
> > Hello,
> >
> > I tried to add multiple manytomany fields to a class, that pointing to
> > the same class.
> >
> > For example:
> >
> > class person(models.Model):
> > name = models.CharField(max_length=30)
> > phone = models.CharField(max_length=9, blank=True, null=True)
> > def __unicode__(self):
> > return self.name
> >
> > class concert(models.Model):
> > title = models.CharField(max_length=80)
> > musicans = models.ManyToManyField(person)
> > coches = models.ManyToManyField(person, blank=True, null=True)
> > def __unicode__(self):
> > return self.title
> >
> >
> > But it doesn't work, how can I do it?
>
> "It doesn't work" is not very specific. It could mean anything from "an
> error was reported" to "it failed silently" all the way up to "my
> computer burst into flames".
>
> So what actually happened?
>
> As James hinted at, I suspect you will actually see an error messages
> when you run "manage.py validate" saying that you need to add a related
> name to one of the ManyToManyFields (the validation will complain about
> both fields, but you need to fix at least one of them).
>
> If that is the case, then the problem is that since the reverse relation
> name for a ManyToManyField is, by default, created from the name of the
> model it is contained in, both of those fields will end up with the same
> default reverse name (used when you are filtering from a Person back to
> a Concert). So you need to set the related_name attribute on one of the
> fields (or on both of them).
>
> Regards,
> Malcolm
>
>
>
> >
>
--
Pablo Catalina <[EMAIL PROTECTED]>
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