These are the instructions to manually update your existing Thunder 3 installation to Thunder 6 including Drupal 9. If you want to do a fresh installation of thunder please visit install Thunder.
The most important change is that we removed the support for AMP and Facebook Instant Articles, because none of them support Drupal 9 currently. If you rely on one of these modules, we recommend that you stay on Thunder 3.5 for now.
You have to make sure that your Thunder 3 project and all its dependencies are fully updated to the most current versions. Run the following command in your docroot:
drush ev "print drupal_get_installed_schema_version('thunder') . PHP_EOL;"
This should print the number 8308 or greater. If that is not the case, update your project.
cd .. composer update
This should update to Thunder 8.3.5 or greater.
Now run database updates:
cd docroot drush updb
You should at least see the Thunder 8308 schema update. If not, double check that the correct version of Thunder is installed, and that
drush updb did not throw any errors.
Before you start with the code and database update please disable the libraries module. The libraries module is not Drupal 9 compatible and its most used functionality is now part of Drupal core. It is therefore not needed anymore. If you use other contrib modules that require the libraries module, please check if these modules support the new core functionality. See https://www.drupal.org/node/3099614
Drupal 9 compatibility
Because Thunder 6 is based on Drupal 9, check your compatibility before your run the upgrade.
Drupal.org provides a good documentation for that: https://www.drupal.org/docs/upgrading-drupal/how-to-prepare-your-drupal-7-or-8-site-for-drupal-9
Check compatibility by running tests
Add the following line to your phpunit.xml file and run your tests.
<env name="SYMFONY_DEPRECATIONS_HELPER" value="strict"/>
If your test suite is based on Behat, https://github.com/caciobanu/behat-deprecation-extension might be interesting for finding deprecated code.
We removed some modules from our codebase. If you are using one of below mentioned modules, please require them manually for your project.
composer require drupal/entity --no-update
Execute the update
All you need to do now is:
composer require thunder/thunder-distribution:^6.0 --no-update composer update drush updb drush cr