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pythonapionchangeodoo10
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FEDERICO LEONI

I would like to use api.onchange as a trigger because I don't want to inherit base fields and use api.depends.
A simple example:

class pos_session2(models.Model):
_inherit = 'pos.session'

@api.one #with or without doesn't make any difference
@api.onchange('start_at','stop_at')	
def _session_costs_control(self):
    _logger.info('Id = %s', self.id)

I get no result (or errors) in log.

How should I call the method?

Edit: Temporary solved creating a  new check field on the same table and calling api.depends.

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Hilar Andikkadavath
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Hi,

You dont need to call the method in new api, the method will automatically invokes when any change is acting on 'start_at','stop_at' these fields.

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FEDERICO LEONI
Author

Problem is the method is not triggered.

In this specific example when I open a new pos session Odoo create the record for 'start_at'. When I close the session Odoo fill with the right datetime the field 'stop_at'.

In both cases _logger.info doesn't show nothing.

Is it possible that onchange is not triggered because it can't see a creation of a new field in a record?

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Yogesh
Best Answer

did you change 'start_at' and 'stop_at' by hand in browser? it will be invoked only if you change them. 
Note: never use @api.one if you intend to return a value from method because it will wrap the returned value in a list. 

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FEDERICO LEONI
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No, with the new API you don't need to edit the views. From the V10 Docs:

Both computed fields and new-API onchanges are automatically called by the client without having to add them in views.

It is possible to suppress the trigger from a specific field by adding on_change="0" in a view:

<field name="name" on_change="0"/>

will not trigger any interface update when the field is edited by the user, even if there are function fields or explicit onchange depending on that field.

About @api.one, I just tried with and without for a test. I prefer stay with api.depends for now.

FEDERICO LEONI
Author

Link: https://www.odoo.com/documentation/10.0/reference/orm.html

Yogesh

you do not need to add on_change() in xml but you need a field in view. on_cahnge() is triggered at client side. so if there is no change in value on_change will not be called.

FEDERICO LEONI
Author

Understood. Thanks.