debian-mirror-gitlab/doc/development/rails_initializers.md
2021-01-30 21:13:34 +05:30

1,016 B

stage group info
none unassigned To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers

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
  2. Changing configuration that Zeitwerk uses, e.g. inflections