error too many values to unpack when display new field on tree view

Question

I made a new model to show the sale price based on fixed margin (see code below)
it worked and displayed on the product view normally,
class Corporate(models.Model):
_inherit = 'product.template'
Marge = fields.Float(string="Marge")
Price = fields.Float(string="Price", compute='compute_Price')
def compute_Price(self):
self.Price = self.Marge * self.standard_price
return self.Price WHen i added the field to product.template tree view, i got this error:
During handling of the above exception, anot

Cybrosys Techno Solutions Pvt.Ltd · Accepted Answer

Hi,
The error message shows which is singleton error. The singleton is occuring because there is more than one record.To avoid the single to error you can use a loop on the beginning of the function
def compute_Price(self):
for rec in self:
rec.Price = rec.Marge * rec.standard_price
return rec.Price

Hope it helps

Yahia · Answer

Thanks it was helpfull

Alex Hathaway · Answer

Most If the time you see an expect singleton error it’s due to the code only being able to handle one computation at a time. Change it so it can handle multiple records at a time.
def compute_Price(self):
for template in self:
template.Price = template.Marge * template.standard_price
self in this case is the entire product.template model not just a single record. So you can loop through each one with a “for loop”. Pick whatever you want for template, could be “purple_unicorn” so long as it’s con

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