Module Foo class Bar Wadus end end Copy 9.3 Thread-safety Everywhere You have to have something similar to this: If the application is loading the framework defaults of Rails 6.0 or 6.1 and it is running in classic mode, it must be opting out by hand. In applications running Rails 6.x there are two scenarios. In applications running a Rails version previous to 6.0, zeitwerk mode is not available.
#RUBYMINE CLASS NAME SHOULD BE A RUBY CONSTANT HOW TO#
If for whatever reason you find a situation you don't know how to resolve, don't hesitate to open an issue in rails/rails and tag 4 How to Activate zeitwerk Mode 4.1 Applications running Rails 5.x or Less This guide will help you change the autoloader with confidence. Many projects, big and small, have reported really smooth switches. If you have a working application autoloading correctly today, chances are the switch will be easy.
Zeitwerk was designed to be as compatible with the classic autoloader as possible. Rails 7 ends the transition period and does not include classic mode. When upgrading to Rails 6.x, it is highly encouraged to switch to zeitwerk mode because it is a better autoloader, classic mode is deprecated. Zeitwerk was developed to address this, among other motivations. The classic autoloader has been extremely useful, but had a number of issues that made autoloading a bit tricky and confusing at times. By default, applications loading the 6.0 and 6.1 framework defaults run in zeitwerk mode, and this is the only mode available in Rails 7. Starting with Rails 6, Rails ships with a new and better way to autoload, which delegates to the Zeitwerk gem. Rails 7 does not include this autoloader anymore. This autoloader is known as classic and is still available in Rails 6.x. From the very beginning, and up to Rails 5, Rails used an autoloader implemented in Active Support.
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