Drupal 9 roadmap
Drupal 9 will be released in 2020.
If you are a contributor of any module on drupal.org and want those sites to live long after the end of life in 2021, you need to prepare for Drupal 9.
Why should you do it at all? First of all, users of your module may want to have it on Drupal 9. Secondly, your clients may ask to migrate their websites to Drupal 9, so it’s better to be ready.
Also, after the Drupal 8 end of life, there won’t be any commits or new features.
Unsupported (not compatible with the latest Drupal core) modules and sites running by Drupal 8 will have vulnerabilities after some time
It is the most important to stay secure if you want to store your users’ private data safely.
And it is important if you need to scale your website and add new functionality.
Updating a codebase from Drupal 8 to 9 is not as hard as updating from 7 to 8.
Only 5 easy but required steps and the last one is optional.
The most important and easiest step is to remove the deprecated code. Some utilities can help you with it.
After installing it you’ll get a report about deprecated functions, classes, and so on.
The most complicated part of this task is to change hook updates in the .install file. For example, you need to change an old class and method SqlContentEntityStorageSchemaConverter::convertToRevisionable to the new one EntityDefinitionUpdateManager::updateFieldableEntityType. You can see a full example here.
But these tools are not perfect. They don’t show deprecated classes or services if you don’t use typehints. Most developers are lazy and don’t do it. For example, in custom constructors.
You need to check it. You may need to use this construction because of entityTypeManager property that was added only in Drupal 8.8 in the EntityViewsData class and many other classes.
Otherwise, you can set a version constraint and only allow usage for those who run Drupal 8.8+.
Besides, platform requirements have changed. Most importantly, this includes new minimum versions of:
- PHP 7.3 or later
- MySQL 5.7 or later
Now you prepared your module to the Drupal 9 release.
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