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I have boolean field and i want to make sql constraint that only 1 record in model could have this field checked. how can i do this?

class ProductPricelist(models.Model):
_inherit = 'product.pricelist'

priority = fields.Boolean('Priority')
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Hi, 
Use api.constrains that will check your record before persisting it in the DB. Like this:

@api.constrains('priority')

 def _check_boolean(self):

    // to boost the performance, you search for only one record that is different from the current one which has the        //boolean checked. If found, then raise.

    checked_bool = self.search([('id', '!=', self.id),('priority', '=', True)], limit=1)  

    if self.priority and checked_bool:

        // Means that more than one record has the field checked.     

       raise ValidationError(_("There's already one checked boolean in record '%s'") % checked_bool.name)


Thanks.

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最佳答案

Use the following code

@api.constrains('priority')

 def _check_priority(self):

    if self.priority:

        checked_bool = self.search([('id', '!=', self.id),('priority', '=', True)])  

        if checked_bool:

            raise ValidationError(_("There's already one priority is checked. Reference : %s") % checked_bool[0].name)

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