Re: multiplying two fields

tanks Ross, i fixed my error but now only show me this

>>> data = Articles.objects.all().annotate(F=('cost_buy') * F('quantity')).output_field=FloatField('result')
>>> print(data)
<django.db.models.fields.FloatField>
>>>

what do you think?

On Fri, Jan 29, 2021 at 2:54 PM Ross Meredith <rossmere67@gmail.com> wrote:

Apologies, typo myself!

That meant to say "typo" not "type".

On Fri, Jan 29, 2021 at 9:52 PM Ross Meredith <rossmere67@gmail.com> wrote:

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.angel@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

--
You received this message because you are subscribed to the Google Groups "Django users" group.
To unsubscribe from this group and stop receiving emails from it, send an email to django-users+unsubscribe@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/django-users/3b573d77-b89a-4b39-95fd-dfd6f9d90910n%40googlegroups.com.

--
You received this message because you are subscribed to the Google Groups "Django users" group.
To unsubscribe from this group and stop receiving emails from it, send an email to django-users+unsubscribe@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/django-users/CAA1Tdz2ka2NskiK5rn8sc8yVQ%3D3xZ8YkTEAUv9HH%2Bb1yiALWqw%40mail.gmail.com.

--

José Ángel Encinas Ing. Tecnologias de la información

Cel:  6622267620                     Never give up...

I     I

--
You received this message because you are subscribed to the Google Groups "Django users" group.
To unsubscribe from this group and stop receiving emails from it, send an email to django-users+unsubscribe@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/django-users/CAF3iVr_MJi%3DkrPxjD%3DeD%2B0s9zf0-NFVs%3Dmb5jAMhjjmSsk8rZg%40mail.gmail.com.