FileUpdateChecker specifies the API used by Rails to watch files and control reloading. The API depends on four methods:

  • initialize which expects two parameters and one block as described below;

  • updated? which returns a boolean if there were updates in the filesystem or not;

  • execute which executes the given block on initialization and updates the counter to the latest timestamp;

  • execute_if_updated which just executes the block if it was updated;

After initialization, a call to execute_if_updated must execute the block only if there was really a change in the filesystem.


This class is used by Rails to reload the I18n framework whenever they are changed upon a new request.

i18n_reloader = ActiveSupport::FileUpdateChecker.new(paths) do

ActionDispatch::Reloader.to_prepare do
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