MongoidAtomicVotes

mongoid_atomic_votes adds possibility to vote on mongoid documents. Each vote mark goes to db by one atomic query that increments vote count, sets vote_value (overall document vote score) and pulls vote mark (embedded document with additional info about voter) to db.

Add this line to your application's Gemfile:

gem 'mongoid_atomic_votes'

And then execute:

$ bundle

or install it yourself as:

$ gem install mongoid_atomic_votes

Include Mongoid::AtomicVotes into your mongoid documents for which you wish to add vote possibility:

class Article
  include Mongoid::Document
  include Mongoid::AtomicVotes
end

Then just call methods on model instances to vote/retract:

@article = Article.find(...)
@user = User.find(...)
@article.vote(1, @user) # vote
@article.retract(@user) # retract

You dont need to save your document after you called #vote or #retract.

Getting overall document vote score:

@article.vote_value

Getting overall vote count:

@article.vote_count

Check whether document has votes:

@article.has_votes?

Check whether document was voted by particular voter:

@article.voted_by? @user

There are some useful scopes:

Article.voted               # documents that have votes
Article.not_voted           # documents without votes
Article.voted_by(@voter)    # documents, voted by @voter
Article.vote_value_in(3..5) # documents with vote_value in 3..5
Article.highest_voted(5)    # 5 highest voted documents