===============
Onchange Helper
===============

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This is a technical module. Its goal is to ease the play of onchange method directly called from Python code.

**Table of contents**

.. contents::
   :local:

Usage
=====

To use this module, you need to:

* depend on this module
* call `yourmodel.play_onchanges(values, ['field'])`

Example if you want to create a sale order and you want to get the values relative to partner_id field (as if you fill the field from UI)

    `vals = {'partner_id': 1}`

    `vals = self.env['sale.order'].play_onchanges(vals, ['partner_id'])`

Then, `vals` will be updated with partner_invoice_id, partner_shipping_id, pricelist_id, etc...

Default values will be used to process onchange methods, if respective fields are not set in `vals`.
You can get them if you pass fields name in the list of fields.


    `vals = {'partner_id': 1}`

    `vals = self.env['sale.order'].play_onchanges(vals, ['partner_id', 'date_order'])`

`vals` will contain, in addition to the changed values, the default value for `date_order`


You can also use it on existing record for example:

     `vals = {'partner_shipping_id': 1}`

     `vals = sale.play_onchanges(vals, ['partner_shipping_id'])`

Then the onchange will be played with the vals passed and the existing vals of the sale. `vals` will be updated with partner_invoice_id, pricelist_id, etc..

Behind the scene, `play_onchanges` will execute **all the methods** registered for the list of changed fields, so you do not have to call manually each onchange. To avoid performance issue when the method is called on a record, the record will be transformed into a memory record before calling the registered methods to avoid to trigger SQL updates command when values are assigned to the record by the onchange


Notes:

- Order in onchange_fields is very important as onchanges methods will be played in that order.
- If you use memory object in `vals`, be award that onchange method in base model call `self.invalidate_cache()` that reset it.

Bug Tracker
===========

Bugs are tracked on `GitHub Issues <https://github.com/OCA/server-tools/issues>`_.
In case of trouble, please check there if your issue has already been reported.
If you spotted it first, help us smashing it by providing a detailed and welcomed
`feedback <https://github.com/OCA/server-tools/issues/new?body=module:%20onchange_helper%0Aversion:%2012.0%0A%0A**Steps%20to%20reproduce**%0A-%20...%0A%0A**Current%20behavior**%0A%0A**Expected%20behavior**>`_.

Do not contact contributors directly about support or help with technical issues.

Credits
=======

Authors
~~~~~~~

* Akretion
* Camptocamp

Contributors
~~~~~~~~~~~~

* Guewen Baconnier <guewen.baconnier@camptocamp.com>
* Florian da Costa <florian.dacosta@akretion.com>
* Andrea Stirpe <a.stirpe@onestein.nl>
* Souheil Bejaoui <souheil.bejaoui@acsone.eu>

Maintainers
~~~~~~~~~~~

This module is maintained by the OCA.

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OCA, or the Odoo Community Association, is a nonprofit organization whose
mission is to support the collaborative development of Odoo features and
promote its widespread use.

This module is part of the `OCA/server-tools <https://github.com/OCA/server-tools/tree/12.0/onchange_helper>`_ project on GitHub.

You are welcome to contribute. To learn how please visit https://odoo-community.org/page/Contribute.