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How do we revert the value of the parameter changed by @api.onchange. Or get the original value back.

I'm on odoo Version 9.

Ex: 

@api.onchange('carrier_id')

def on_carrier_changed(self):

    if something:

        # give some warning & do some logic

        # revert back carrier_id

Thanks!

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Hi no i didn’t find an answer to that question, but my coworker suggested to change the way I do things to eliminate needing to go into onchange: Doing validation in other area, using domain filter to filter out values I don’t want…etc


Update:

old values are in self._origin. Self only contains new values. Even self.id = openerp.models.NewId

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Check The Onchange Product if stock is not available it will display warning as well as data will store.

so in your case you can erase your field and raise a warning

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I'm too new to this forum to post a commentary so please forgive me my 'answer'.

Have you found any solution? I am searching for about an hour now and I cannot find any way how to solve it!

Thank you!

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old values are in self._origin. Self only contains new values. Even self.id = openerp.models.NewId