# Gemfile
gem 'mongoid', github: "mongoid/mongoid", branch: "master"

 
#mongo_test.rb
require 'mongoid'
class Product
  include Mongoid::Document
  field :name,  type: String
end

Mongoid.load! "mongoid.yml", :development
Product.destroy_all
Product.create(name: "Mongo test")

while true
  print Product.all.first.name
  sleep 1
end

#mongoid.yml
development: 
  clients: 
    default: 
      uri: "mongodb://localhost/mongo_test"
      options: 
        read: 
          mode: :primary
        server_selection_timeout: 10
        socket_timeout: 5

, [2015-06-08T13:13:54.522779 #31341] DEBUG -- : MONGODB | QUERY | namespace=mongo_test.products selector={} flags=[] limit=0 skip=0 project=nil | runtime: 158644.8395ms
D, [2015-06-08T13:13:54.523294 #31341] DEBUG -- : MONGODB | COMMAND | namespace=admin.$cmd selector={:ismaster=>1} flags=[] limit=-1 skip=0 project=nil | runtime: 151666.8334ms
/home/vagrant/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/mongo-2.0.4/lib/mongo/socket.rb:161:in `read': Interrupt
	from /home/vagrant/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/mongo-2.0.4/lib/mongo/socket.rb:161:in `read_from_socket'
	from /home/vagrant/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/mongo-2.0.4/lib/mongo/socket.rb:126:in `block in read'
	from /home/vagrant/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/mongo-2.0.4/lib/mongo/socket.rb:173:in `handle_errors'
	from /home/vagrant/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/mongo-2.0.4/lib/mongo/socket.rb:123:in `read'
	from /home/vagrant/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/mongo-2.0.4/lib/mongo/protocol/serializers.rb:62:in `deserialize'
	from /home/vagrant/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/mongo-2.0.4/lib/mongo/protocol/message.rb:193:in `deserialize_header'
	from /home/vagrant/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/mongo-2.0.4/lib/mongo/protocol/message.rb:83:in `deserialize'
	from /home/vagrant/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/mongo-2.0.4/lib/mongo/server/connectable.rb:110:in `block in read'
	from /home/vagrant/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/mongo-2.0.4/lib/mongo/server/connectable.rb:95:in `ensure_connected'
	from /home/vagrant/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/mongo-2.0.4/lib/mongo/server/connectable.rb:110:in `read'
	from /home/vagrant/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/mongo-2.0.4/lib/mongo/server/connectable.rb:67:in `block in dispatch'
	from /home/vagrant/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/mongo-2.0.4/lib/mongo/loggable.rb:44:in `log'
	from /home/vagrant/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/mongo-2.0.4/lib/mongo/loggable.rb:65:in `log_debug'
	from /home/vagrant/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/mongo-2.0.4/lib/mongo/server/connectable.rb:65:in `dispatch'
	from /home/vagrant/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/mongo-2.0.4/lib/mongo/operation/read/query.rb:61:in `block in execute_message'
	from /home/vagrant/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/mongo-2.0.4/lib/mongo/server/connection_pool.rb:99:in `with_connection'
	from /home/vagrant/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/mongo-2.0.4/lib/mongo/server/context.rb:63:in `with_connection'
	from /home/vagrant/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/mongo-2.0.4/lib/mongo/operation/read/query.rb:60:in `execute_message'
	from /home/vagrant/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/mongo-2.0.4/lib/mongo/operation/read/query.rb:54:in `execute'
	from /home/vagrant/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/mongo-2.0.4/lib/mongo/collection/view.rb:164:in `send_initial_query'
	from /home/vagrant/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/mongo-2.0.4/lib/mongo/collection/view/iterable.rb:39:in `each'
	from /home/vagrant/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/bundler/gems/mongoid-2f806d1d38b4/lib/mongoid/query_cache.rb:207:in `each'
	from /home/vagrant/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/bundler/gems/mongoid-2f806d1d38b4/lib/mongoid/contextual/mongo.rb:240:in `first'
	from /home/vagrant/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/bundler/gems/mongoid-2f806d1d38b4/lib/mongoid/contextual/mongo.rb:240:in `block in first'
	from /home/vagrant/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/bundler/gems/mongoid-2f806d1d38b4/lib/mongoid/contextual/mongo.rb:489:in `try_cache'
	from /home/vagrant/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/bundler/gems/mongoid-2f806d1d38b4/lib/mongoid/contextual/mongo.rb:239:in `first'
	from /home/vagrant/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/bundler/gems/mongoid-2f806d1d38b4/lib/mongoid/contextual.rb:20:in `first'
	from ./mongo_test.rb:12:in `<main>'