Voteable Mongo (for Mongoid 3 / 4)¶ ↑

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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.

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.

• www.naiku.net

• www.amorveneris.com

• zheye.org

• megalyrics.ru

To install the gem, add this to your Gemfile

gem 'rs_voteable_mongo'

After that, remember to run “bundle install”

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

@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)

@user.unvote(@comment)

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

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

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

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

@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)

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

Rails

rake mongo:voteable:init_stats

Ruby

Mongo::Voteable::Tasks::init_stats

Rails

rake mongo:voteable:remake_stats

Ruby

Mongo::Voteable::Tasks.remake_stats

Rails

rake mongo:voteable:migrate_old_votes

Ruby

Mongo::Voteable::Tasks.migrate_old_votes

• Alex Nguyen - Author

• Contributors

Copyright © 2010-2011 Vinova Pte Ltd

Licensed under the MIT license.