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Document upgrading instructions for Spring

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Xavier Noria 2021-09-09 01:10:03 +02:00
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guides/source/upgrading_ruby_on_rails.md
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@ -78,6 +78,16 @@ To allow you to upgrade to new defaults one by one, the update task has created
Upgrading from Rails 6.1 to Rails 7.0
-------------------------------------
### Spring
If your application uses Spring, it needs to be upgraded to at least version 2.2.0. Otherwise you'll get
```
undefined method `mechanism=' for ActiveSupport::Dependencies:Module
```
Also, make sure `config.cache_classes` is set to `false` in `config/environments/test.rb`.
### Applications need to run in `zeitwerk` mode
Applications still running in `classic` mode have to switch to `zeitwerk` mode. Please check the [upgrading guide for Rails 6.0](https://guides.rubyonrails.org/upgrading_ruby_on_rails.html#autoloading) for details.