A simple, easy to use Rails 3.1 voting Gem.
add the voter_love gem to your Gemfile:
gem 'voter_love'
create and generate the voter_love migration:
rails generate voter_love
you will then need to add up_votes and down_votes columns to your User (voter) and Object (e.g. links) (votable) migrations:
add_column :users, :up_votes, :integer, :null => false, :default => 0 add_column :users, :down_votes, :integer, :null => false, :default => 0 add_column :links, :up_votes, :integer, :null => false, :default => 0 add_column :links, :down_votes, :integer, :null => false, :default => 0
Turn your objects (e.g. links) into a votable model:
class Link < ActiveRecord::Base acts_as_votable end
Turn your users (or any other model) into a voter model:
class User < ActiveRecord::Base acts_as_voter end
To vote for an object (with an error raised if user already voted on the object):
user.up_vote(link) user.down_vote(link)
To vote for an object (and ignore the vote if the user has already voted on the object):
user.up_vote!(link) user.down_vote!(link)
Total score (up votes - down votes)
link.score