remote: git://github.com/mongoid/mongoid.git
  revision: fe7f43430580860db6d1d89cea27eda24ab60ab1
  specs:
    mongoid (4.0.0)
      activemodel (~> 4.0.0.rc1)
      moped (~> 1.4)
      origin (~> 1.0)
      tzinfo (~> 0.3.22)

class User
  include Mongoid::Document
end

3.times { User.create }
User.all.to_a.size
  #=> 3
User.limit(1).to_a.size
  #=> 1
User.limit(0).to_a.size
  #=> 3