from odoo import api, fields, models, _
from odoo.exceptions import UserError


class StockPickingBatch(models.Model):
    _inherit = 'stock.picking.batch'

    @api.multi
    def print_pick_list(self):
        pickings = self.mapped('picking_ids')
        if not pickings:
            raise UserError(_('Nothing to print.'))
        return self.env.ref('stock_picklist.picklist').report_action(pickings, data=None, config=False)