What's the best plugin these days for implementing voting on a Rails site?
Two I'm aware of are:
There's no general 'best' solution. Check out how both work and see what best fits what you want and what fits your application's needs. In this case, acts_as_votable allows voting on models. vote_fu contains more as it ads the concept of 'acts_as_voter' to limit the models that may vote. It also adds 'has_karma' to give karma based on user voting.
As you see, both are different options and only you know what best fits your needs.
Coming in a bit late here, but from what I can tell vote_fu was inspired by acts_as_voteable (and supports its syntax), but is more actively developed.
vote_fu is very outdated and isn't compatible with modern rails distributions (I'm using 3.2.5). Thumbs_up has replaced it form Rails 3.x development. Go with that or either acts_as_votable as they are still being maintained.
Thumbs_up has some extra options like built-in karma tracking.
来源：https://stackoverflow.com/questions/1397845/best-way-to-implement-voting-in-a-rails-application