--- stage: none group: unassigned info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments --- # Rails initializers By default, Rails loads Zeitwerk after the initializers in `config/initializers` are loaded. Autoloading before Zeitwerk is loaded is now deprecated but because we use a lot of autoloaded constants in our initializers, we had to move the loading of Zeitwerk earlier than these initializers. A side-effect of this is that in the initializers, `config.autoload_paths` is already frozen. To run an initializer before Zeitwerk is loaded, you need put them in `config/initializers_before_autoloader`. Ruby files in this folder are loaded in alphabetical order just like the default Rails initializers. Some examples where you would need to do this are: 1. Modifying Rails' `config.autoload_paths` 1. Changing configuration that Zeitwerk uses, for example, inflections