Hi all,

I've introduced an _sql_constraints  with a custom module.

I've created a custom model inheriting the res.partner model, this is the script in the model.py file:

# -*- coding: utf-8 -*-
from odoo import models, fields, api
# class custom_accounting_mgmt(models.Model):
#     _name = 'custom_accounting_mgmt.custom_accounting_mgmt'
#     name = fields.Char()
#     value = fields.Integer()
#     value2 = fields.Float(compute="_value_pc", store=True)
#     description = fields.Text()
#
#     @api.depends('value')
#     def _value_pc(self):
#         self.value2 = float(self.value) / 100
class Partner(models.Model):
    _inherit = 'res.partner'
    _sql_constraints = [
    ('vat_unique',
    'UNIQUE(name, vat)',
    "Attenzione!!! la Partita deve essere univoca, esiste già un altro cliente con lo stesso nome e la stessa partita iva."),
    ('x_fiscal_code_unique',
    'UNIQUE(x_fiscal_code)',
    "Attenzione!!! Esiste già un altro cliente con lo stesso Codice Fiscale."),
    ]

now the issue is from gui, if I try to violate the _sql_constraints the application si showing the following exception:

Traceback (most recent call last):
  File "C:\Program Files (x86)\Odoo 11.0\server\odoo\service\model.py", line 97, in wrapper
    return f(dbname, *args, **kwargs)
  File "C:\Program Files (x86)\Odoo 11.0\server\odoo\http.py", line 332, in checked_call
    result = self.endpoint(*a, **kw)
  File "C:\Program Files (x86)\Odoo 11.0\server\odoo\http.py", line 933, in __call__
    return self.method(*args, **kw)
  File "C:\Program Files (x86)\Odoo 11.0\server\odoo\http.py", line 512, in response_wrap
    response = f(*args, **kw)
  File "C:\Program Files (x86)\Odoo 11.0\server\odoo\addons\web\controllers\main.py", line 930, in call_kw
    return self._call_kw(model, method, args, kwargs)
  File "C:\Program Files (x86)\Odoo 11.0\server\odoo\addons\web\controllers\main.py", line 922, in _call_kw
    return call_kw(request.env[model], method, args, kwargs)
  File "C:\Program Files (x86)\Odoo 11.0\server\odoo\api.py", line 689, in call_kw
    return call_kw_multi(method, model, args, kwargs)
  File "C:\Program Files (x86)\Odoo 11.0\server\odoo\api.py", line 680, in call_kw_multi
    result = method(recs, *args, **kwargs)
  File "C:\Program Files (x86)\Odoo 11.0\server\odoo\addons\base\res\res_partner.py", line 514, in write
    result = result and super(Partner, self).write(vals)
  File "C:\Program Files (x86)\Odoo 11.0\server\odoo\addons\mail\models\mail_thread.py", line 277, in write
    result = super(MailThread, self).write(values)
  File "C:\Program Files (x86)\Odoo 11.0\server\odoo\addons\mail\models\mail_activity.py", line 327, in write
    return super(MailActivityMixin, self).write(vals)
  File "C:\Program Files (x86)\Odoo 11.0\server\odoo\models.py", line 3024, in write
    self._write(old_vals)
  File "C:\Program Files (x86)\Odoo 11.0\server\odoo\models.py", line 3125, in _write
    cr.execute(query, params + (sub_ids,))
  File "C:\Program Files (x86)\Odoo 11.0\server\odoo\sql_db.py", line 155, in wrapper
    return f(self, *args, **kwargs)
  File "C:\Program Files (x86)\Odoo 11.0\server\odoo\sql_db.py", line 232, in execute
    res = self._obj.execute(query, params)
psycopg2.IntegrityError: ERRORE:  un valore chiave duplicato viola il vincolo univoco "res_partner_x_fiscal_code_unique"
DETAIL:  La chiave (x_fiscal_code)=(SCFFPP85B13G273D) esiste già.


During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Program Files (x86)\Odoo 11.0\server\odoo\http.py", line 647, in _handle_exception
    return super(JsonRequest, self)._handle_exception(exception)
  File "C:\Program Files (x86)\Odoo 11.0\server\odoo\http.py", line 307, in _handle_exception
    raise pycompat.reraise(type(exception), exception, sys.exc_info()[2])
  File "C:\Program Files (x86)\Odoo 11.0\server\odoo\tools\pycompat.py", line 87, in reraise
    raise value
  File "C:\Program Files (x86)\Odoo 11.0\server\odoo\http.py", line 689, in dispatch
    result = self._call_function(**self.params)
  File "C:\Program Files (x86)\Odoo 11.0\server\odoo\http.py", line 339, in _call_function
    return checked_call(self.db, *args, **kwargs)
  File "C:\Program Files (x86)\Odoo 11.0\server\odoo\service\model.py", line 141, in wrapper
    raise ValidationError(inst[0])
TypeError: 'IntegrityError' object does not support indexing