A simple Rails 3 recommendations engine
Latest commit 1eb9560 Oct 31, 2011 @diogenes Gemspec tweaks
I'm not lying anymore! :-)
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test Fix support for MRI 1.9 Oct 31, 2011
.document Initial commit to coletivo. May 27, 2011
.gitignore Remove RCov dependency Jun 11, 2011
LICENSE.txt Initial commit to coletivo. May 27, 2011
README.rdoc Some README tweaks Sep 20, 2011
Rakefile Gemspec tweaks Oct 31, 2011
VERSION Version bump to 0.0.3 Oct 31, 2011



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


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

  # ...

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)

Contributing to coletivo

  • 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.


Copyright © 2011 Diógenes Falcão. See LICENSE.txt for further details.