1--- 2stage: none 3group: unassigned 4info: 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 5--- 6 7# Rails initializers 8 9By default, Rails loads Zeitwerk after the initializers in `config/initializers` are loaded. 10Autoloading before Zeitwerk is loaded is now deprecated but because we use a lot of autoloaded 11constants in our initializers, we had to move the loading of Zeitwerk earlier than these 12initializers. 13 14A side-effect of this is that in the initializers, `config.autoload_paths` is already frozen. 15 16To run an initializer before Zeitwerk is loaded, you need put them in `config/initializers_before_autoloader`. 17Ruby files in this folder are loaded in alphabetical order just like the default Rails initializers. 18 19Some examples where you would need to do this are: 20 211. Modifying Rails' `config.autoload_paths` 221. Changing configuration that Zeitwerk uses, for example, inflections 23