You cannot use properties in django orm , it does not allow that.
TransactionEntry.objects.defer("users").annotate(total_price=F("num_shares")*F("price_per_share")).values('total_price')
On Thursday, 17 June 2021 at 03:23:01 UTC+5:30 VISHESH MANGLA wrote:
> Hello,
>
> I wanted to know that how for the model below, how can I get a queryset
> with all the fields excluding the `user` and including the output of
> get_output_field? Please avoid hardcoding.
> One way is
>
> `TransactionEntry
> .objects.defer("users").annotate(total_price=F("num_shares")*F("price_per_share"))`
>
> but that is undesirable. I just want to use that function on the model and
> not hard code the formula.
> Thanks,
>
>
>
> class TransactionEntry(models.Model):
> """Model to save data of users who want to buy/sell shares"""
>
> user = models.ForeignKey(
> to=Relative,
> on_delete=models.CASCADE,
> related_name="transaction_entry",
> )
>
> num_shares = models.PositiveIntegerField(null=False, blank=False)
> date_of_trade = models.DateField(null=False, blank=False)
> transaction_type = models.CharField(
> max_length=1,
> choices=TransactionType.choices,
> default=TransactionType.SELL,
> null=False,
> )
> price_per_share = models.FloatField(null=False, blank=False)
>
> def get_total_price(self):
> return self.num_shares * self.price_per_share
>
>
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