cooperative-market/beesdoo_shift/wizard/assign_super_coop.py

from odoo import models, fields, api, _


class AssignSuperCoop(models.TransientModel):
    _name = 'beesddoo.shift.assign_super_coop'

    super_coop_id = fields.Many2one('res.users', 'New Super Cooperative', required=True, domain=[('super', '=', True)])
    shift_ids = fields.Many2many('beesdoo.shift.shift', readonly=True, default=lambda self: self._context.get('active_ids'))

    @api.multi
    def write_super_coop(self):
        self.ensure_one()
        self.shift_ids.write({'super_coop_id' : self.super_coop_id.id})