This gem for change Mongoid id field as Integer like MySQL.
Idea from MongoDB document: How to Make an Auto Incrementing Field
Installation
gem 'mongoid_auto_increment_id'REQUIREMENTS
- Mongoid 2.2.0+
USAGE
ruby > post = Post.new(:title => "Hello world")
=> #<Post _id: , _type: nil, title: "Hello world", body: nil>
ruby > post.save
=> true
ruby > post.inspect
=> "#<Post _id: 6, _type: nil, title: \"Hello world\", body: nil>"
ruby > Post.find("6")
=> "#<Post _id: 6, _type: nil, title: \"Hello world\", body: nil>"
ruby > Post.find(6)
=> "#<Post _id: 6, _type: nil, title: \"Hello world\", body: nil>"
ruby > Post.desc(:_id).all.to_a.collect { |row| row.id }
=> [20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1]