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Nissan Pagotaisidro

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! 

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Serpent Consulting Services Pvt. Ltd.
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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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Nissan Pagotaisidro
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Thank you for fast reply!