Paths of Glory - On the road to achievements!

In short, it's a re-usable model for creating an achievement system.

It's extracted from http://peertester.com and inspired by: http://stackoverflow.com/questions/885277/how-to-implement-an-achievement-system-in-ror.

Note: This is a fork of the original projects by Paul Campbell which works with Rails 3. Most of the core foundation can be accredited to the origin author.

Installation

Update your Gemfile and run bundle install:

gem 'paths_of_glory', :git => 'git://github.com/raid5/paths_of_glory.git', :branch => 'rails3'

Setup

Generate the migration:

rails generate paths_of_glory

And run the migration:

rake db:migrate

This creates the required table. Then, in your User model add the following include:

class User < ActiveRecord::Base
  include Achievements
end

In your application.rb, modify your autoload path:

config.autoload_paths += %W( #{Rails.root}/app/models/achievements )

Usage

Paths of Glory gives you access to a DSL to generate achievements. Achievements can have multiple levels or can just be standalone achievements.

Create a new achievement with the name Glory, which observers the User model:

rails generate achievement Glory User

This gives you app/models/achievements/glory.rb and app/models/achievements/glory_observer.rb with some bootstrapped code. Edit these files to meet your needs. Finally, you will need to activate the observer, by adding :glory_observer to your list of observers in application.rb.

config.active_record.observers = :glory_observer, :some_other_observer

The Achievement

Once-off achievements will be awarded the first time the specified requirement is met.

On the other hand, you can also specify multi-level achievements which are awarded when the specified quotes are met. You first define the quotas:

level 1, :quota => 10
level 2, :quota => 20

Then establish what needs to be checked against the quotes. As an example, the number of comments a user has made:

set_thing_to_check { |user| user.comments.count }

Finally, when these quotes are met, the achievement will be awarded.

The Observer

The model observer classes will determine when to check for awarding an achievement. As an example, if the class is observing a Comment model, then you can check if an achievement needs to be awarded when a comment is saved:

def after_save(comment)
  SomeCommentAchievement.award_achievements_for(comment.user) unless comment.new_record?
end

Sample App

Also, checkout my sample app for a working example.