A Ruby Object Mapper for Mongo.


Build Status

Coverage Status


$ gem install mongo_mapper



MongoMapper is tested against:

  • MRI 2.4 - 2.7
  • JRuby (Versions with 1.9 compatibility)

Additionally, MongoMapper is tested against:

  • Rails 5.0+ - 6.0

Contributing & Development

$ git clone && cd mongomapper
$ bundle install
$ bundle exec rake
  • Fork the project.
  • Make your feature addition or bug fix. All specs should pass.
  • Add specs for your changes. This is important so I don't break it in a future version unintentionally.
  • Commit, do not mess with Rakefile, version, or history. If you want to have your own version, that is fine but bump version in a commit by itself in another branch so a maintainer ignore it when your pull request is merged.
  • Send a pull request. Bonus points for topic branches.

Problems or Questions?

Hit up the Google group:

Copyright (c) 2009-2020 MongoMapper. See LICENSE for details.


MongoMapper/Plucky is:

  • John Nunemaker
  • Chris Heald
  • Scott Taylor

But all open source projects are a team effort and could not happen without everyone who has contributed. See CONTRIBUTORS for the full list. Thank you!