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Add up / down voteability to Mongoid and MongoMapper documents. Optimized for speed by using only ONE request to validate, update, and retrieve updated data.

README.rdoc

Voteable Mongo

voteable_mongo allows you to make your Mongoid::Document or MongoMapper::Document objects voteable and tabulate votes count and votes point for you. For instance, in a forum, a user can vote up (or down) on a post or a comment. It's optimized for speed by using only ONE database request per collection to validate, update, and retrieve updated data.

Initial idea based on cookbook.mongodb.org/patterns/votes.

Sample app at github.com/vinova/simple_qa.

Wonder how fast voteable_mongo is compare to other SQL & MongoDB solutions? Visit benchmarks at github.com/vinova/voteable_benchmarks

Why voteable_mongo?

There are various solutions for up / down voting problem (1, 2, 3, 4, …). Most of them using additional votes table (SQL) or votes collection (MongoDB) to store votes and do data tabulation on that votes table or votes collection.

voteable_mongo is different. It takes advantage of document-oriented database to store all related votes data inside voteable document. That has following benefits:

  • Don't have to maintain additional votes table or votes collection.

  • When voteable document is loaded, all votes data related to it also be loaded, no more additional database requests to see how many votes this document got, who give up votes who give down vote, total vote points, votes count …

  • When vote up, vote down, revote, unvote, voteable_mongo validates vote data, updates voteable document and retrieves updated data using only ONE database request thanks to atomic findAndModify operation.

  • Atomic operations on single document warranty data integrity that makes sure if votes created / changed / deleted their associated counters and points will be updated.

So use voteable_mongo for less maintain cost, data integrity and save database requests for other tasks.

Sites using voteable_mongo

Installation

Rails 3.x

To install the gem, add this to your Gemfile

gem 'mongoid'
gem 'voteable_mongo'

After that, remember to run “bundle install”

Usage

Make Post and Comment voteable, User become the voter

Mongoid

post.rb

class Post
  include Mongoid::Document
  include Mongo::Voteable

  # set points for each vote
  voteable self, :up => +1, :down => -1

  has_many :comments
end

comment.rb

require 'post'

class Comment
  include Mongoid::Document
  include Mongo::Voteable

  belongs_to :post

  voteable self, :up => +1, :down => -3

  # each vote on a comment can affect votes count and point of the related post as well
  voteable Post, :up => +2, :down => -1
end

user.rb

class User
  include Mongoid::Document
  include Mongo::Voter
end

MongoMapper

post.rb

class Post
  include MongoMapper::Document
  include Mongo::Voteable

  # set points for each vote
  voteable self, :up => +1, :down => -1

  many :comments
end

comment.rb

require 'post'

class Comment
  include MongoMapper::Document
  include Mongo::Voteable

  belongs_to :post

  voteable self, :up => +1, :down => -3
  voteable Post, :up => +2, :down => -1
end

user.rb

class User
  include MongoMapper::Document
  include Mongo::Voter
end

Make a vote

@user.vote(@post, :up)

Is equivalent to

@user.vote(:votee => @post, :value => :up)
@post.vote(:voter => @user, :value => :up)

In case you don't need to init voter and / or votee objects you can

@user.vote(:votee_class => Post, :votee_id => post_id, :value => :down)
@post.vote(:voter_id => user_id, :value => :up)
Post.vote(:voter_id => user_id, :votee_id => post_id, :value => :up)

Undo a vote

@user.unvote(@comment)

If have voter_id, votee_id and vote value you don't need to init voter and votee objects (suitable for API calls)

New vote

Post.vote(:voter_id => user_id, :votee_id => post_id, :value => :up)

Re-vote

Post.vote(:voter_id => user_id, :votee_id => post_id, :value => :up, :revote => true)

Un-vote

Post.vote(:voter_id => user_id, :votee_id => post_id, :value => :up, :unvote => true)

Note: vote function always return updated votee object

Get vote_value

@user.vote_value(@post)
@user.vote_value(:votee_class => Post, :votee_id => post_id)
@post.vote_value(@user)
@post.vote_value(user_id)

Check if voted?

@user.voted?(@post)
@user.voted?(:votee_class => Post, :votee_id => post_id)
@post.voted_by?(@user)
@post.voted_by?(user_id)

Get votes counts and points

puts @post.votes_point
puts @post.votes_count
puts @post.up_votes_count
puts @post.down_votes_count

Get voters given voted object and voter class

@post.up_voters(User)
@post.down_voters(User)
@post.voters(User)
- or -
User.up_voted_for(@post)
User.down_voted_for(@post)
User.voted_for(@post)

Get the list of voted objects of a class

Post.voted_by(@user)
Post.up_voted_by(@user)
Post.down_voted_by(@user)

Utilities

Set counters and point to 0 for uninitialized voteable objects in order sort and query

Rails

rake mongo:voteable:init_stats

Ruby

Mongo::Voteable::Tasks::init_stats

Re-generate counters and vote points in case you change :up / :down vote points

Rails

rake mongo:voteable:remake_stats

Ruby

Mongo::Voteable::Tasks.remake_stats

Migrate from voteable_mongoid version < 0.7.0

Rails

rake mongo:voteable:migrate_old_votes

Ruby

Mongo::Voteable::Tasks.migrate_old_votes

Credits

Copyright © 2010-2011 Vinova Pte Ltd

Licensed under the MIT license.

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