Migrazione alla versione 12.0

Prima della migrazione

Verificare di essere aggiornati alle ultime convenzioni OCA: https://odoo-community.org/page/contributing
Iscriversi alla mailing list del relativo progetto: https://odoo-community.org/groups
Nella issue GitHub chiamata "Migration to version 12.0" indicare quale modulo si vuole migrare

Operazioni da effettuare nella migrazione

Aggiornare il modulo alla versione 12.0.1.0.0
Usare il nuovo sistema di realizzazione del README, copiando https://github.com/OCA/maintainer-tools/tree/master/template/module/readme e modificando o rimuovendo le sezioni necessarie. You can then run locally oca-gen-addon-readme if you have OCA/maintainer-tools installed and you want to pregenerate the README.rst file (preferred), or keep previous README.rst file.
Remove any possible migration script from previous version.
Add tests to increase code coverage.
If you handle dates and datetimes, you might need to adapt your code now that Odoo returns always native Python objects, so no more fields.Date/Datetime.from_string is needed. For converting old style date/datetime strings to Python object, use fields.Date.to_date and fields.Datetime.to_datetime methods.
If you overwrite create method (in a new model or in an inherited one), look if you can apply decorator @api.model_create_multi for batch mode creation. See https://www.odoo.com/es_ES/slides/slide/let-s-create-records-faster-602 for more details.
If your model uses _parent_store = True, then you should remove parent_left and parent_right fields, and add a new one parent_path = fields.Char(index=True). For providing full support when migrating, a post-migration script should be done calling env['model_name']._parent_store_compute() for filling this new field.
All <label> elements in views must have a for="" attribute.
All <filter> elements in search views must have a name attribute.
All <button> elements in a tree view should have a string attribute for accessibility.
Convert your SASS styles to SCSS.
Related fields are now read only by default. If your code relies on the default contrary, you should add readonly=False in your field definition.
base module has reorganized all the model files to include everything inside models folder. If you import that files, you should change import path. You can automate most of these changes with these bash commands:

find . -type f -name '*.py' | xargs sed -i 's/from odoo.addons.base.res/from odoo.addons.base.models/g'
find . -type f -name '*.py' | xargs sed -i 's/from http://odoo.addons.base.ir/from  odoo.addons.base.models/g'

If you need to generate a PDF in tests, you have to pass the context key force_report_rendering=True for getting that instead of an HTML, as now the method qweb_render_pdf defaults to qweb_render_html on test environment.
Do the rest of the changes you need to do for making the module works on new version.

Howto Technical method to migrate a module from "11.0" to "12.0" branch

$REPO: the OCA repository hosting the module
$MODULE: the name of the module you want to migrate
$USER_ORG: your GitHub login or organization name

Full process for beginners in Git flows

On a shell command:

$ git clone https://github.com/OCA/$REPO -b 12.0
$ git checkout -b 12.0-mig-$MODULE origin/12.0
$ git format-patch --keep-subject --stdout origin/12.0..origin/11.0 -- $MODULE | git am -3 --keep

Check https://github.com/OCA/maintainer-tools/wiki/Merge-commits-in-pull-requests for a procedure for reducing commits from "OCA Transbot...".
Adapt the module to the 12.0 version following tasks to do.
On a shell command:

$ git add --all
$ git commit -m "[MIG] $MODULE: Migration to 12.0"
$ git remote add $USER_ORG [email protected]:$USER_ORG/$REPO.git # This mode requires an SSH key in the GitHub account
$ ... or ....
$ git remote add $USER_ORG https://github.com/$USER_ORG/$REPO.git # This will required to enter user/password each time
$ git push $USER_ORG 12.0-mig-$MODULE --set-upstream

Short method for advanced users that know the rest of the Git flow

$ git remote update # In case the repo was already cloned before $ git checkout -b 12.0-mig- origin/12.0 $ git format-patch --keep-subject --stdout origin/12.0..origin/11.0 -- | git am -3 --keep

Troubleshooting

Sometimes, when performing these operations, the process can hang due to conflicts on the patches being applied. One of the possible problems is because a patch removes entirely a file and git am is not able to resolve this. It ends with a message error: ...: patch does not apply.

If that's your case, you can add --ignore-whitespace at the end of the git am command for allowing the patch to be applied, although there will be still conflicts to be solved, but they will be doable through standard conflict resolution system. Starting from the previous situation, you will need to do:

git am --abort git format-patch --keep-subject --stdout origin/12.0..origin/11.0 -- | git am -3 --keep --ignore-whitespace

resolve conflicts (for example git rm )

git add --all git am --continue

Initialization (already done in OCA)

Before migrating the first module, the following tasks must be performed in the repository:

Create empty 12.0 branch.
Create metafiles (.travis.yml and README.md) from 11.0, adapting them to have the proper data.
Make 12.0 default branch.

There's an script to automate all these process in: https://github.com/OCA/maintainer-tools/blob/master/tools/migrate_branch_empty.py.

Some repositories PSCs have decided to keep previous procedure putting installable flag on module as False, using this script: https://github.com/OCA/maintainer-tools/blob/master/tools/migrate_branch.py.