Rails server doesn't see code changes and reload files

Add the following to config/environments/development.rb

#config.file_watcher = ActiveSupport::EventedFileUpdateChecker
config.file_watcher = ActiveSupport::FileUpdateChecker

FileUpdateChecker will detect by polling the change of the file.

I've solved my problem adding below line to the development.rb file.

config.reload_classes_only_on_change = false