data = Articles.objects.all().annotate(result=F('coust_buy') *
F('quantity')).output_field=FloatField('result'),
contains a type for the field "cost_buy" (i.e. not "coust_by").
If that isn't it please give us the traceback.
On Fri, Jan 29, 2021 at 8:50 PM jose angel encinas ramos <
encinasj.an...@gmail.com> wrote:
> Guys gd evening
>
> I need help,really i don't kwnow how to do a multiply two fields, have a
> model called Articles.
>
> class Articles(models.Model):
> #models article
> Nuevo = 'Nuevo'
> Semi_nuevo = 'Semi_nuevo'
> Usado = 'Usado'
> Otros = 'Otros'
> STATE_ACTUAL = (
> (Nuevo, 'Nuevo'),
> (Semi_nuevo,'Semi_nuevo'),
> (Usado,'Usado'),
> (Otros,'Otros')
> )
> name = models.CharField(max_length=50)
> quantity = models.PositiveIntegerField()
> fk_brand = models.ForeignKey(Brand, null=True, on_delete=models.SET_NULL)
> model = models.CharField(max_length=50)
> fk_category = models.ForeignKey(Category, null=True,
> on_delete=models.SET_NULL)
>
> cost_buy = models.DecimalField(max_digits=10, decimal_places=2)
> fk_supplier = models.ForeignKey(Supplier, null=True, on_delete=
> models.SET_NULL)
> userful_life = models.DateField()
> actual_state = models.CharField(max_length=12, choices=STATE_ACTUAL)
> date_check = models.DateField()
> location = models.CharField(max_length=50)
> img = models.ImageField(upload_to='articles', null=True, blank=True)
> description = models.TextField(blank=True)
> #actions
> created = models.DateTimeField(auto_now_add=True)
> update = models.DateTimeField(auto_now=True)
>
> class Meta:
> verbose_name = 'Article'
> verbose_name_plural = 'Articles'
>
> @property
> def result(self,*args, **kwargs):
> mult = self.cost_buy * self.quantity
> return mult
>
> class Meta:
> verbose_name = 'Article'
> verbose_name_plural = 'Articles'
>
> def __str__(self):
> return '{} {} {}'.format(self.name ,self.cost_buy, self.quantity)
>
> so i want to multiply 2 filed , *cost_buy* * *quantity* and the result
> show in the template
>
> i was to try did this query in view.py
> data = Articles.objects.all().annotate(result=F('coust_buy') * F(
> 'quantity')).output_field=FloatField('result')
>
>
> but isn't work
>
>
>
>
>
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