rails-api is a sub-set of rails to be used when creating a JSON API app. Dependencies shouldn't be an issue, since it's basically just a stripped down version of rails. Supposedly it is passing all tests. (Not sure if that includes testing with stuff like jruby) Reproducible: Always
To manage expectations, please see the policy of the ruby project for adding new packages: http://www.gentoo.org/proj/en/prog_lang/ruby/index.xml#doc_chap7