id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
30795	Django cannot serialize value into migration file.	Sebastian Rossi	nobody	"Hi there i'm having problems when trying to use the command makemigrations with manage.py. The output is the following:
{{{
Migrations for 'reg':
  reg\migrations\0012_auto_20190917_1711.py
    - Remove field Products from tenant
    - Add field products to tenant
    - Alter field productos on preaprobado
    - Alter field tenant_id on preaprobado
    - Alter field CMS_id on producto
    - Alter field CMS_id on tenant
}}}

**Traceback errors**

{{{
ValueError: Cannot serialize: <Producto: Basico - ['IPTEL', 'Rocstar', 'Test_DVT']>
    There are some values Django cannot serialize into migration files.
    For more, see https://docs.djangoproject.com/en/2.2/topics/migrations/#migration-serializing
}}}

The thing is that the entire app works just fine but for some reason i can't understand i cannot migrate the db.

Here is the models.py:

{{{
class Tenant(models.Model):
    Name = models.CharField(max_length = 30, unique = True)
    Enabled = models.BooleanField(default = False)
    CMS_id = models.PositiveIntegerField(unique = True)
    Logo = models.ImageField(upload_to = ""Logos/"", blank = True)
    Icon = models.ImageField(upload_to = ""Icons/"", blank = True)
    Domain = models.URLField(default = ""http://localhost:8000"")
    Master = models.BooleanField(default = False)
    products = models.ManyToManyField(Producto, related_name = ""tenants"")

    def __str__(self):
        return(self.Name)

# Override del metodo que salva en la db para que si se quiere salvar un Tenant con Master = True y
# existe un Tenant con mismo dominio y Master = True no pueda salvar
    def save(self, *args, **kwargs):
        #busca tenant con mismo dominio y Master = True
        try:
            master_tenant = Tenant.objects.filter(Domain = self.Domain).get(Master = True)
            #Si el tenant encontrado es el que se quiere salvar chequeo que sea Master = True y salvo
            #sino pido Master = True. Chequea tambien que el master tenga logo e icono si o si
            if master_tenant.id == self.id:
                if self.Master:
                    if self.Logo != """" and self.Icon != """":
                        super(Tenant, self).save(*args, **kwargs)
                    else:
                        raise ValidationError({""Logo"" : ""Logo required"", ""Icon"" : ""Icon rquired""})
                else:
                    raise ValidationError({""Master"" : ""At least one Master per Domain""})
            else:
                #Si no es el Master = True del dominio y Master = False guarda, sino error
                if self.Master:
                    if self.Logo != """" and self.Icon != """":
                        super(Tenant, self).save(*args, **kwargs)
                    else:
                        raise ValidationError({""Logo"" : ""Logo required"", ""Icon"" : ""Icon rquired""})
                else:
                    super(Tenant, self).save(*args, **kwargs)

        #Si no existe tenant con mismo Domain y Master = True, Se fija que Master = True y que tenga logo e icono y salva, sino, error
        except Tenant.DoesNotExist:
            if self.Master:
                if self.Logo != """" and self.Icon != """":
                    super(Tenant, self).save(*args, **kwargs)
                else:
                    raise ValidationError({""Logo"" : ""Logo required"", ""Icon"" : ""Icon rquired""})
            else:
                raise ValidationError({""Master"" : ""At least one Master per Domain""})


class Preaprobado(models.Model):
    codigo = models.CharField(max_length = 100)
    tenant_id = models.ForeignKey(Tenant, on_delete = models.CASCADE, related_name = ""tenant"")
    can_register = models.BooleanField(default = True)
    is_registered = models.BooleanField(default = False)
    productos = models.ManyToManyField(Producto, related_name = ""preaprobados"", default = Producto.objects.get(id = 1))

    def __str__(self):
        return(self.codigo + ""-"" + self.tenant_id.Name)



    class Meta():
        #No permite un par codigo-tenant repetido dentro del modelo Preaprobado
        constraints = [
        models.UniqueConstraint(fields = [""codigo"", ""tenant_id""], name = ""par código-Tenant únicos""),
        ]
}}}

Any help is welcomed since i actually can't find what is wrong with the code. Not even in the documentation. I'm new with Django so maybe the solution is pretty easy but i can't find it."	Bug	closed	Core (Serialization)	dev	Normal	invalid	Serialize, makemigrations, migrate		Unreviewed	0	0	0	0	0	0