mongoid-eager-loading

mongoid-eager-loading adds the eager loading feature for mongoid.

Originally it is my pull request for mongoid, but it is not accepted yet, so I created this gem to get the eager loading benefits easily for my projects.

I only test it in mongoid 2.0.0.beta.19 and 2.0.0.beta.20, maybe you can try it on other mongoid version, and let me know if it works fine.

Usage

define it in your Gemfile

gem "mongoid-eager-loading"

suppose you have a mongoid model Post

class Post
  include Mongoid::Document

  referenced_in :user
  references_many :comments
end

then you can use the eager loading like

Post.includes(:user)
Post.includes(:user, :comments)

eager loading can be only used on referenced_in, references_one and references_many associations.

Benchmark

I also run a benchmark on my local computer, the result is as follows

Starting benchmark...
                                                                  user     system      total        real
Finding 10 posts with person, without eager loading           0.000000   0.000000   0.000000 (  0.005373)
Finding 10 posts with person, with eager loading              0.010000   0.000000   0.010000 (  0.002984)
Finding 50 posts with person, without eager loading           0.010000   0.000000   0.010000 (  0.022207)
Finding 50 posts with person, with eager loading              0.010000   0.000000   0.010000 (  0.006831)
Finding 100 posts with person, without eager loading          0.040000   0.000000   0.040000 (  0.050991)
Finding 100 posts with person, with eager loading             0.010000   0.000000   0.010000 (  0.012867)
Finding 1000 posts with person, without eager loading         0.390000   0.050000   0.440000 (  0.477983)
Finding 1000 posts with person, with eager loading            0.120000   0.010000   0.130000 (  0.128879)

Author

Richard Huang :: flyerhzm@gmail.com :: @flyerhzm

Copyright

Copyright (c) 2010 Richard Huang. See LICENSE for details.