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In When using the Classic Autoloader in Rails 6 application it is recommended to set concurrency level to 1 in development environment, for the web servers and background processors, due to the thread-safety concerns.In Rails 5.2, assigning to a collection of attachments declared with With the default configuration for Rails 6.0, assigning to a collection of attachments replaces existing files instead of appending to them.In the case of a Rails upgrade, that will mean every single piece of functionality in the application. Major and Minor versions are allowed to make changes to the public API, so this may cause errors in your application.Do yourself a favor and make sure your test coverage is good you start an upgrade. Patch versions only include bug fixes, and don't change any public API. Then run the Update task mentioned below to update configuration files, then run your tests.Please make sure to depend on at least Bootsnap 1.4.4 in that case.The new configuration point lookups (less directories to check), and save Bootsnap work and memory consumption, since it does not need to build an index for these directories.
If your application has STIs, please check their section in the guide Autoloading and Reloading Constants (Zeitwerk Mode).
The new Rails version might have different configuration defaults than the previous version.
However, after following the steps described above, your application would still run with configuration defaults from the value.
(enter "h" for help) [Ynaqdh] force config/conflict config/...
Don't forget to review the difference, to see if there were any unexpected changes.
For more information on changes made to Rails 6.0 please see the release notes.