from odoo import models


class MailActivity(models.Model):
    _inherit = 'mail.activity'

    def action_open_document(self):
        # OVERRIDE
        # when opening the "View all activities", and opening a return, we actually want the kanban view of return checks
        if self.res_model != 'account.return':
            return super().action_open_document()

        return self.env['account.return'].browse(self.res_id).action_open_account_return()