A quick and easy plugin to allow models to find their rank for a particular attribute.
For example, if you want to find the ranking of a particular user based on their score. ("You are #22 on the high score list!")
Add to your Gemfile and run the
bundle command to install it.
Requires Ruby 1.9.2 or later.
In your model, call rank_by and pass in a column name.
class User < ActiveRecord::Base rank_by :score end
You can then find the rank by calling name_ranking.
This gem is made to work with MySQL, which does not have a built in ranking function. It uses the technique mentioned here: http://arjen-lentz.livejournal.com/56292.html
Questions or problems? Please post them on the issue tracker. You can contribute changes by forking the project and submitting a pull request. You can ensure the tests passing by running
This gem is created by Wil Gieseler and is under the MIT License.