Re: Stuck with Calculated feild

Hi Eankomah,

You have several solution depending upon your need:

 

Le mercredi 23 septembre 2020 07:24:05 UTC+2, eankomah a écrit :
Hi all am stuck at getting total_price Calculated in my model
 
class inventory(models.Model):
    def __str__(self):
        return self.name
  ...
    total_price = models.FloatField(total=('unit_price' * 'quantity'))
  ...
Thanks

 

First dr neyx de godlove answer is the more elegant if you do not need a dedicated db field.

You just need to remove the 'get_' prefix  in get_total_price :

 

    @property

    def total_price(self):

        total_price = self.unit_price * self.quantity

        return total_price

 

(@dr neyx de godlove, thank I learned the use of property in django trying you solution)

 

Then if you really need a dedicated field, create it and override the save method in your model :

    total_price = models.FloatField()

 

    def save(self, *args, **kwargs):

        #change total_price

        # Transaction.save(update_fields['total_price'])

        self.total_price = self.unit_price * self.quantity

        super(Inventory, self).save(*args, **kwargs)

Best Regards

--

Frédéric Salvetat 

Le mercredi 23 septembre 2020 07:24:05 UTC+2, eankomah a écrit :

Hi all am stuck at getting total_price Calculated in my model

class inventory(models.Model):

    def __str__(self):

        return self.name

    category = models.ForeignKey(Category, null=True, on_delete = models.SET_NULL)

    Supplier = models.ForeignKey(Supplier, null=True, on_delete = models.SET_NULL)

    product = models.ForeignKey(Product, null=True, on_delete = models.SET_NULL)

    quantity = models.FloatField()

    unit_price = models.FloatField()

    total_price = models.FloatField(total=('unit_price' * 'quantity'))

    selling_price = models.FloatField()

    date_created = models.DateTimeField(auto_now_add=True) 

Thanks

Le mercredi 23 septembre 2020 07:24:05 UTC+2, eankomah a écrit :

Hi all am stuck at getting total_price Calculated in my model

class inventory(models.Model):

    def __str__(self):

        return self.name

    category = models.ForeignKey(Category, null=True, on_delete = models.SET_NULL)

    Supplier = models.ForeignKey(Supplier, null=True, on_delete = models.SET_NULL)

    product = models.ForeignKey(Product, null=True, on_delete = models.SET_NULL)

    quantity = models.FloatField()

    unit_price = models.FloatField()

    total_price = models.FloatField(total=('unit_price' * 'quantity'))

    selling_price = models.FloatField()

    date_created = models.DateTimeField(auto_now_add=True) 

Thanks

Le mercredi 23 septembre 2020 07:24:05 UTC+2, eankomah a écrit :

Hi all am stuck at getting total_price Calculated in my model

class inventory(models.Model):

    def __str__(self):

        return self.name

    category = models.ForeignKey(Category, null=True, on_delete = models.SET_NULL)

    Supplier = models.ForeignKey(Supplier, null=True, on_delete = models.SET_NULL)

    product = models.ForeignKey(Product, null=True, on_delete = models.SET_NULL)

    quantity = models.FloatField()

    unit_price = models.FloatField()

    total_price = models.FloatField(total=('unit_price' * 'quantity'))

    selling_price = models.FloatField()

    date_created = models.DateTimeField(auto_now_add=True) 

Thanks

Le mercredi 23 septembre 2020 07:24:05 UTC+2, eankomah a écrit :

Hi all am stuck at getting total_price Calculated in my model

class inventory(models.Model):

    def __str__(self):

        return self.name

    category = models.ForeignKey(Category, null=True, on_delete = models.SET_NULL)

    Supplier = models.ForeignKey(Supplier, null=True, on_delete = models.SET_NULL)

    product = models.ForeignKey(Product, null=True, on_delete = models.SET_NULL)

    quantity = models.FloatField()

    unit_price = models.FloatField()

    total_price = models.FloatField(total=('unit_price' * 'quantity'))

    selling_price = models.FloatField()

    date_created = models.DateTimeField(auto_now_add=True) 

Thanks

Le mercredi 23 septembre 2020 07:24:05 UTC+2, eankomah a écrit :

Hi all am stuck at getting total_price Calculated in my model

class inventory(models.Model):

    def __str__(self):

        return self.name

    category = models.ForeignKey(Category, null=True, on_delete = models.SET_NULL)

    Supplier = models.ForeignKey(Supplier, null=True, on_delete = models.SET_NULL)

    product = models.ForeignKey(Product, null=True, on_delete = models.SET_NULL)

    quantity = models.FloatField()

    unit_price = models.FloatField()

    total_price = models.FloatField(total=('unit_price' * 'quantity'))

    selling_price = models.FloatField()

    date_created = models.DateTimeField(auto_now_add=True) 

Thanks

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