aht do you advice me to do ?
Le mardi 12 mai 2020 08:32:04 UTC+1, Uri Kogan a écrit :
>
> From the error message it can be seen that mail_item_count has "country"
> item which is "CharField".
> But... the signal receiver sets this to instance of "Pays" object which
> assumes it is "ForeignKey".
>
> On Tuesday, May 12, 2020 at 9:41:16 AM UTC+3, hajar wrote:
>>
>>
>> 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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