from odoo import models, api, fields
from odoo.exceptions import UserError
from datetime import datetime
import logging

_logger = logging.getLogger(__name__)


class CustCommision(models.Model):
    _name = 'cust.commision'
    _order = 'id desc'

    partner_id = fields.Many2one('res.partner', String='Customer', required=True)
    commision_percent = fields.Float(string='Commision %', tracking=3)

    @api.constrains('partner_id')
    def _check_partner_id(self):
        for rec in self:
            duplicate_partner = self.search([
                ('partner_id', '=', rec.partner_id.id),
                ('id', '!=', rec.id)
            ])
            if duplicate_partner:
                raise UserError('Partner already exists')