Hi,
I have 2 modules in Odoo 16 named A and B, i migrated the modules into Odoo 18 and merged as a single module named C, so my question is that, while during the database migration from Odoo 16 to Odoo 18 in sh is i get an error? For database migration is i need to kept the same module without merging? How odoo sh fetch the fields and models?
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Hi,
Odoo.sh migrations work by comparing your existing database structure (models, fields, table names) with the modules loaded in the new codebase. If modules A and B existed in Odoo 16 but are removed or renamed in Odoo 18, Odoo will not automatically know where their old fields/models went.
If you merge A and B into a new module C before migrating, the migration script may fail because Odoo expects the old module names to still exist so it can update their models/fields instead of thinking they were deleted.
For a smooth migration, the safest option is to keep the same module names and model names during migration, and only merge/refactor after your database is successfully upgraded.
If you really want to merge them before migration, you must ensure that all model names, table names, and field names remain exactly the same, otherwise Odoo will not find them and migration scripts may drop data or fail.
Odoo.sh does not automatically understand that you merged modules. It just loads whatever modules exist in your code, reads their manifests, and updates the database structure based on the models and fields it finds. If a model or module that existed before is missing now, Odoo assumes you intentionally removed it.
So yes, merging modules can cause migration issues if the old models or fields are not present anymore. The safest approach is to complete the migration first with the original modules still in place, and only merge them into one module after the database is successfully upgraded.
Hope it helps.
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