I'm currently working on a plugin. To set the (minimal) testing
environment for the plugin up I invoke Rails::Initializer (instead of
loading config/environment.rb). As the plugin just depends on AR I
tried to disable all apparently unneeded frameworks. However, it's not
possible to disable more than :action_mailer and :active_resource.
Loading the database config file e. g. requires ERB which again is
part of ActionView. ActionController can't be disabled as ActionView
depends on it in turn (AV requires html-parser 'html/document', which
isn't found unless AC is loaded).
Now I wondered if these depenencies are intended (to keep complexety
as low as possible), and -- if not --, whether there're plans for
rather autonomous frameworks.