How to check _sql_constraints using function: Odoo 9

Question

Hi guys,
I want to check *_sql_constraints* of  a model using *function*
Example , I have a function
@api.one
*def* check_constraint(self)
# CODE TO CHECK
*return* True # If ok
*return* False # If not ok The below constraint must raise an error if the function returns False
_sql_constraints = [ .................] I know It is possible  by overriding the create method. But I forgot the correct way
Thanks in advance

Axel Mendoza · Accepted Answer

Use python constraints instead
https://www.odoo.com/documentation/9.0/reference/orm.html#openerp.api.constrains
https://www.odoo.com/documentation/9.0/reference/orm.html#openerp.models.Model._constraints

Nilmar Shereef · Answer

Hi Shameem,
you have two ways.
one way:
*std_id = fields.Char(string="Student ID", required=True)    *
*_sql_constraints = [('std_id_uniq', 'unique(std_id)', 'This ID already exists !')]*
Another way using api:
*mark1 = fields.Integer(string="Total Mark")*
*@api.constrains('mark1')    *
*def _check_mark1(self):
if self.mark1 == 0:
raise ValidationError("Please enter the marks !")*
*
*
Also you can check any logical operations inside the constrains function.
Hope this may help you*
*

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