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Removal of migration scripts on each new version

by
Opener B.V., Stefan Rijnhart
- 06/05/2025 13:00:04
Hi,

the migration guide mandates the following

> Remove any possible migration script from previous version (in a nutshell, remove migrations folder inside the module if exists).

(https://github.com/OCA/maintainer-tools/wiki/Migration-to-version-18.0#tasks-to-do-in-the-migration)

However, it is not uncommon to skip versions when migrating an Odoo instance. You would go from 15.0 or 16.0 to 18.0 rather than migrating every year. When using the Odoo enterprise migration, the migration scripts between the source and the target version are supposed to be present in the target version. So the migration guideline breaks this type of migration.

I had a disagreement with Pedro Baeza about this on one PR, but I keep coming across instances of this such as https://github.com/OCA/account-invoicing/pull/1874 today so I would like to discuss this in a wider audience.

My preference would be for the guideline to change to say that it is allowed to keep some of the scripts if they are safe for inclusion in the later version (such as the script from https://github.com/OCA/account-invoicing/pull/1874, which checks if a field already exists before trying to add it).

Can I have a temperature check from the community to see how you all feel about this?

Best regards,
Stefan

-- 
Opener B.V. - Business solutions driven by open source collaboration

Stefan Rijnhart - Consultant/developer

mail: stefan@opener.amsterdam
tel: +31 (0) 6 1447 8606
web: https://opener.amsterdam

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