class mail_item(models.Model):
#mail_item_fid =
models.OneToOneField(Mail_item_Event,on_delete=models.CASCADE)
Event_cd = models.OneToOneField(Mail_item_Event,on_delete=models.CASCADE,
related_name="mail_item_event_cd")
office_Evt_cd = models.ForeignKey(Office,on_delete=models.CASCADE,
related_name='office_Ev')
Date_Evt = models.DateTimeField()
Pays_origine = models.ForeignKey(Pays, on_delete=models.CASCADE ,
related_name='paysOrigine')
Pays_destination = models.ForeignKey(Pays,on_delete=models.CASCADE,
related_name='paysDestination')
Expediteur_id = models.ForeignKey(Client,on_delete=models.CASCADE,
related_name='expedi')
Destinateur_id = models.ForeignKey(Client,on_delete=models.CASCADE,
related_name='destin')
Le mardi 12 mai 2020 06:43:43 UTC+1, hajar a écrit :
>
> hello django users ,
>
> I am trying to update a class using signals , you will understand once you
> see the code below
>
> class mail_item_count(models.Model):
> country = models.CharField(max_length=100)
> count = models.IntegerField(default=1)
>
>
> def __str__(self):
> return '{}, {}'.format(self.country,self.count)
>
> def sum(self):
> a = sum(instance.count for instance in self.objects.all())
> return a
>
>
> @receiver(post_save, sender=mail_item)
> def update_count(sender, instance, created, **kwargs):
> count_object,_ =
> mail_item_count.objects.get_or_create(country=instance.Pays_origine)
>
> count_object.count = count_object.count + 1
> count_object.save()
>
> but I am getting this error :
>
> *" Tried to update field dashboard.mail_item_count.country with a model
> instance, <Pays: Maroc >. Use a value compatible with CharField. "*
>
> can you help me out solving it
>
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