Method has_group odoo

purchase.py

class PurchaseOrderLine(models.Model):
    _inherit = 'purchase.order.line'

    @api.one
    def _get_verify_user_group(self):
        self.verify_user_group = False
        if self.env['res.users'].has_group('purchase.group_purchase_manager'):
            self.verify_user_group = True

    def _default_user_group(self):
        if self.env['res.users'].has_group('purchase.group_purchase_manager'):
            return True
        return False


    production_id = fields.Many2one(related='order_id.production_id',
                                    string='Orden de Producción')
    # production_line = fields.One2many('mrp.production', 'purchase_id', 'Orden de prod')
    mrp_line = fields.One2many('mrp.product.line', 'purchases_line_id',
                               'Orden produccion')
    type_purchase = fields.Selection([('op', 'Orden produccion'),
                                      ('service', 'Servicio'),
                                      ('stock', 'Stock')], 'Tipo de compra',
                                      related='order_id.type_purchase')
    verify_user_group = fields.Boolean("Verify User Group",
                                       compute="_get_verify_user_group",
                                       default=_default_user_group)
    production_move_ref_id = fields.Many2one('stock.move', string='Ref. Movimiento')