coletivo

A simple Rails 3 recommendations engine. Coletivo uses Euclidean Distance or Pearson’s Correlation Coefficient to calculate the similarity between persons and their preferences.

Installation:

sudo gem install coletivo
rails g coletivo
rake db:migrate

At your Rails model that represents a person (can be an User, Member, or something like that):

class User < ActiveRecord::Base
  has_own_preferences

  # ...
end

So, a person can rate things:

current_user = User.create(:name => 'Diogenes')
movie = Movie.create(:name => 'The Tourist', :year => 2010)

current_user.rate!(movie, 4.5)

And after a lot of ratings… recommendations:

Movie.find_recommendations_for(current_user) # => movies and more movies...

By default, the similarity strategy used is Euclidean Distance, but you can change that passing the strategy option:

Movie.find_recommendations_for(current_user, :strategy => :pearson)

Check out the latest master to make sure the feature hasn’t been implemented or the bug hasn’t been fixed yet
Check out the issue tracker to make sure someone already hasn’t requested it and/or contributed it
Fork the project
Start a feature/bugfix branch
Commit and push until you are happy with your contribution
Make sure to add tests for it. This is important so I don’t break it in a future version unintentionally.
Please try not to mess with the Rakefile, version, or history. If you want to have your own version, or is otherwise necessary, that is fine, but please isolate to its own commit so I can cherry-pick around it.