Stuck with Calculated feild

[eankomah]

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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