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Ernesto Ruiz

I have an entity teacher with a Many2One field "substitute_teacher_id". The idea is that a teacher can replace other teacher, but a teacher should not be able to replace himself. How can I set that restriction in the teacher's model and/or view to ensure that a teacher cannot select a teacher with the same id as a substitute? This is my code

class Teacher(models.Model):
    _name = 'school.teacher'
    _description = 'School Teacher'

    name = fields.Char(string="Name")
    substitute_teacher_id = fields.Many2one('school.teacher', string="Sustitute")

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Sudhir Arya (ERP Harbor Consulting Services)
Best Answer

You can do it using constrains:

from odoo.exceptions import ValidationError

@api.constrains('substitute_teacher_id')
def _check_substitute_teacher(self):
    for teacher in self:
        if teacher.id == teacher.substitute_teacher_id.id:
            raise ValidationError('You cannot set yourself as Substitute Teacher.')

This will check the Substitute Teacher field and raise the message to the user if user has set himself/herself as Substitute Teacher.

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Paresh Wagh
Best Answer

Hi Ernesto:

You can define a domain for the Many2one field like so

substitute_teacher_id = fields.Many2one('school.teacher', string="Substitute", domain="[('id', '!=', id)]")


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