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I have a fields.Char attribute “identification_id”, That field must have  11 characters. How can I add a _sql_constraints to check the length of that field and ensure it should be 11 ?

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_sql_constraints = [
        (
            'identification_id_len_check',
            'check (LENGTH(identification_id) = 11)',
            ('identification_id should be 11 symbols')
        ),
    ]
SQL constraints are faster in comparison to api.constrains. 
Make sure that none of your existing records have different size. Otherwise, constrain would not be created


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Annuleer
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Hi,

If it is not mandatory to for _sql_constraints, try to achieve the same using the constrains.

@api.constrains('identification_id')
def check_identification_id(self):
for rec in self:
if len(rec.identification_id) != 11:
raise ValidationError(_('Must be 11 Characters'))


See : How To Add Constrains For A Field in Odoo12


Thanks

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