I worked extensively with sails.js about three years ago and it was an unmitigated disaster. The ORM has about 1/8th of Rails' functionality and queries that would be trivial with Active Record were a nightmare. On top of that the community was a mess and around the end of that time, a lot of the core maintainers dropped out because there was so much in fighting.
Unless there have been some major changes I highly advise staying away from sails.js.