This gem for change Mongoid id field as Integer like MySQL.

Idea from MongoDB document: How to Make an Auto Incrementing Field

Status

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]

Performance

with mongoid_auto_increment_id:

      user     system      total        real
Generate 1  0.010000   0.000000   0.010000 (  0.006182)
Post current: 1

Generate 100  0.130000   0.010000   0.140000 (  0.406619)
Post current: 101

Generate 10,000  10.160000   0.560000  10.720000 ( 12.518690)
Post current: 10101

without:

      user     system      total        real
Generate 1  0.000000   0.000000   0.000000 (  0.171523)
Post current: 1

Generate 100  0.110000   0.000000   0.110000 (  0.129670)
Post current: 101

Generate 10,000  9.340000   0.470000   9.810000 ( 11.233426)
Post current: 10101