Multi tool use

Django Inline Formsets

I'm struggling against this for a long time, and I cant find enough information to solve this.

I have these two Models:

class Perfil(models.Model):
CORE = (('3', '3'),('6', '6'))
user = models.ForeignKey(User, on_delete=models.PROTECT, verbose_name="Username")
timestamp = models.DateTimeField(auto_now_add=True)
nome = models.CharField(verbose_name="Perfil", max_length=200, unique=True, null=True, blank=True )
num_bobines = models.PositiveIntegerField(verbose_name="Número de bobines")
largura_bobinagem = models.DecimalField(verbose_name="Largura da bobinagem", max_digits=10, decimal_places=2)
core = models.CharField(verbose_name="Core", max_length=1, choices=CORE)
gramagem = models.DecimalField(verbose_name="Gramagem", max_digits=10, decimal_places=2)
espessura = models.DecimalField(verbose_name="Espessura", max_digits=10, decimal_places=2)
densidade_mp = models.DecimalField(verbose_name="Densidade da matéria prima", max_digits=10, decimal_places=2)
velocidade = models.DecimalField(verbose_name="Velocidade", max_digits=10, decimal_places=2)
producao = models.DecimalField(verbose_name="Produção", max_digits=10, decimal_places=2)
class Meta:
verbose_name_plural = "Perfis"
ordering = ['-timestamp']

def __str__(self):
return '%s' % (self.nome)

class Largura(models.Model):
perfil = models.ForeignKey(Perfil, on_delete=models.CASCADE, verbose_name="Largura")
num_bobine = models.PositiveIntegerField(verbose_name="Bobine nº")
largura = models.DecimalField(max_digits=5, decimal_places=2, null=True, blank=True)


class Meta:
verbose_name_plural = "Larguras"
ordering = ['perfil']

def __str__(self):
return '%s - Bobine nº: %s, %s mm' % (self.perfil, self.num_bobine, self.largura)


When i create one "Perfil", it generates "Largura" based on "num_bobines":

def perfil_larguras(sender, instance, **kwargs):
for i in range(instance.num_bobines):
lar = Largura.objects.create(perfil=instance, num_bobine=i+1)
lar.save()

post_save.connect(perfil_larguras, sender=Perfil)


Now i am having problems with creating an inline formset to update the field "largura" for all instances with the same foreignkey.

Can anyone help me with this?

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