Hummmm, denormalizing...it isn't best solution On 19 Ago, 16:25, Nick <nickt...@gmail.com> wrote: > You need to look at overriding the model's save method in order to add > data from one field to another dynamically. > > http://docs.djangoproject.com/en/dev/topics/db/models/#overriding-mod... > > On Aug 19, 2:03 am, djnubbio <giuseppe.nati...@gmail.com> wrote: > > > 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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