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 eveningI need help,really i don't kwnow how to do a multiply two fields, have a model called Articles.--class Articles(models.Model):#models articleNuevo = '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)#actionscreated = models.DateTimeField(auto_now_add=True)update = models.DateTimeField(auto_now=True)class Meta:verbose_name = 'Article'verbose_name_plural = 'Articles'@propertydef result(self,*args, **kwargs):mult = self.cost_buy * self.quantityreturn multclass 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 templatei was to try did this query in view.pydata = Articles.objects.all().annotate(result=F('coust_buy') * F('quantity')).output_field=FloatField('result')but isn't work
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