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A simple Rails 3 recommendations engine
branch: master

Gemspec tweaks

I'm not lying anymore! :-)
latest commit 1eb95604bb
@diogenes authored
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lib Fix support for MRI 1.9
.document Initial commit to coletivo.
.gitignore Remove RCov dependency
Gemfile Declare SQLite dependency for :development environment
LICENSE.txt Initial commit to coletivo.
README.rdoc Some README tweaks
Rakefile Gemspec tweaks
VERSION Version bump to 0.0.3
coletivo.gemspec Gemspec tweaks



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.

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