Constraint number of characters in a fields.Char

Question

Hello! Help me on how to constraint a number of characters in a fields.Char?
and number must be minimum of 12 and maximum of 15 characters
here's my models.py
bir_id = fields.Char(size=15)
def _check_length(self, cr, uid, ids, context=None):
for record in self.browse(cr, uid, ids):
if record.bir_id < 12:
return False
return True
_constraints = [(_check_length, 'Error', ['bir_id'])]

when i enter less than 12 characters, there's no error. What do you think is the problem?
Thank you!

Serpent Consulting Services Pvt. Ltd. · Accepted Answer

Hi Nissan,
To check the length (number of characters in your string), you should use len(your_string).
Ex:
if len(record.bir_id) < 12 or len(record.bir_id) > 15:
# raise exception or return False
return False
Hope this will help you.

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