Constraints and Validation in Odoo

Constraints and Validation in Odoo — a practical guide to Odoo constraints validation with clear examples you can reuse in real projects.

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Short description

Fail early with clear messages users can act on.

constrains

from odoo.exceptions import ValidationError

@api.constrains('pages')
def _check_pages(self):
    for rec in self:
        if rec.pages < 0:
            raise ValidationError('Pages cannot be negative.')