Sorry for wasting your preciuose time. I'm very newby in django.

I have de following

class Commessa(models.Model):
    commessa = models.CharField(max_length=20)
     quota_oraria=models.DecimalField(max_digits=5, decimal_places=2)
  ...

class Diario(models.Model):
    data= models.DateField('data inizio')
    commessa = models.ForeignKey(Commessa)
    ore=models.IntegerField()
...


I want to add a column to Commessa containg the result of:

quota_oraria * sum(ore)

for each item in commessa.

any suggestion will be greatly appreciated; tank vwry much in advance

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