What happens to custom developments after an Odoo version upgrade

Question

So the idea is that you send in a database to Odoo, and then you will get one back that is adapted to a newer Odoo version.

Now I wonder what happens with all custom developments. What happens to tables and fields that were added through custom developments? Does that data still exist in the database we will get back?

Yenthe Van Ginneken (Mainframe Monkey) · Accepted Answer

Hi Christoph,
Odoo will migrate/rework all default Odoo data tables according to the new version. They do not touch the fields and tables of custom development so you get them back 'as-is' basically.
This means that you will need to migrate your custom code and that if you need field or table changes on your custom development that you are responsible for doing so.
In general Odoo does not touch custom code nor models/fields.
With kind regards,
Yenthe

Ray Carnes (ray) · Answer

The Upgrade Service is limited to the technical conversion and adaptation of the database to make it compatible with the Target Version, the correction of any Bug directly caused by the upgrade operation and not normally occurring in the Target Version, and the conversion of the source code and data of Covered Extra Modules for the Target Version.

Extra Module - An extra module is a directory of source code files, or a set of Python-based customizations created in a database (e.g. with Odoo Stu

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