Description
The Active Record Reputation System helps you build the reputation system for your Rails application. It allows Active Record to have reputations and get evaluated by other records. This gem allows you to:
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README
ActiveRecord Reputation System
The Active Record Reputation System helps you build the reputation system for your Rails application. It allows Active Record to have reputations and get evaluated by other records. This gem allows you to:
- define reputations in easily readable way.
- integrate reputation systems into applications and decouple the system from the main application.
- discover more about your application and make better decisions.
Installation
If you are updating to version 2 from version older, you should check out migration guide.
For Rails 3 use versions 2.0.2 and older.
Add to Gemfile:
gem 'activerecord-reputation-system'
Run:
bundle install
rails generate reputation_system
rake db:migrate
- Please do the installation on every upgrade as it may include new migration files.
Quick Start
Let's say we want to keep track of user karma in Q&A site where user karma is sum of questioning skill and answering skill. Questioning skill is sum of votes for user's questions and Answering skill is sum of average rating of user's answers. This can be defined as follow:
class User < ActiveRecord::Base
has_many :answers
has_many :questions
has_reputation :karma,
:source => [
{ :reputation => :questioning_skill, :weight => 0.8 },
{ :reputation => :answering_skill }]
has_reputation :questioning_skill,
:source => { :reputation => :votes, :of => :questions }
has_reputation :answering_skill,
:source => { :reputation => :avg_rating, :of => :answers }
end
class Answer < ActiveRecord::Base
belongs_to :user, :as => :author
has_reputation :avg_rating,
:source => :user,
:aggregated_by => :average,
:source_of => [{ :reputation => :answering_skill, :of => :author }]
end
class Question < ActiveRecord::Base
belongs_to :user
has_reputation :votes,
:source => :user
end
Once reputation system is defined, evaluations for answers and questions can be added as follow:
@answer.add_evaluation(:avg_rating, 3, @user)
@question.add_evaluation(:votes, 1, @user)
Reputation value can be accessed as follow:
@answer.reputation_for(:avg_rating) #=> 3
@question.reputation_for(:votes) #=> 1
@user.reputation_for(:karma)
You can query for records using reputation value:
User.find_with_reputation(:karma, :all, { :condition => 'karma > 10' })
You can get source records that have evaluated the target record:
@question.evaluators_for(:votes) #=> [@user]
You can get target records that have been evaluated by a given source record:
Question.evaluated_by(:votes, @user) #=> [@question]
To use a custom aggregation function you need to provide the name of the method
on the :aggregated_by option
, and implement this method on the model.
On the example below, our aggregation function sums all values and multiply by ten:
class Answer < ActiveRecord::Base
belongs_to :author, :class_name => 'User'
belongs_to :question
has_reputation :custom_rating,
:source => :user,
:aggregated_by => :custom_aggregation
def custom_aggregation(*args)
rep, source, weight = args[0..2]
# Ruby doesn't support method overloading, so let's handle parameters on a condition
# For a new source, these are the input parameters:
# rep, source, weight
if args.length == 3
rep.value + weight * source.value * 10
# For an updated source, these are the input parameters:
# rep, source, weight, oldValue, newSize
elsif args.length == 5
oldValue, newSize = args[3..4]
rep.value + (source.value - oldValue) * 10
end
end
end
Documentation
Please refer Wiki for available APIs and more information.
Authors
Katsuya Noguchi
Related Links
- RailsCasts: http://railscasts.com/episodes/364-active-record-reputation-system
- Inspired by "Building Web Reputation Systems" by Randy Farmer and Bryce Glass
Versioning
For transparency and insight into our release cycle, releases will be numbered with the follow format:
<major>.<minor>.<patch>
And constructed with the following guidelines:
- Breaking backwards compatibility bumps the major
- New additions without breaking backwards compatibility bumps the minor
- Bug fixes and misc changes bump the patch
For more information on semantic versioning, please visit http://semver.org/.
License
Copyright 2012 Twitter, Inc.
Licensed under the Apache License, Version 2.0: http://www.apache.org/licenses/LICENSE-2.0
*Note that all licence references and agreements mentioned in the ActiveRecord Reputation System README section above
are relevant to that project's source code only.