Yippee, ha funzionato
codice in plugin.rb
def forum_require(path)
require Rails.root.join('plugins', 'forum', 'app', path).to_s
end
after_initialize do
forum_require 'lib/ldap_setting_validator'
//codice
end
ldap_setting_validator.rb → path → myplugin/app/lib/ldap_setting_validator.rb
grazie per l’esempio → babble/plugin.rb at master · gdpelican/babble · GitHub