Rails and MongoDB

mongoid.yml

To use multiple MongoDB database through Mongoid use set_database inside the Mongoid model to set the database 

module Cache
  class Inquiry
    include Mongoid::Document
    
    set_database :cache
...

And add the configuration for :cache to mongoid.yml

production:
  database: abc_production
  hosts: [[server1, 27017], [server2, 27017]]
  databases:
    cache:
      database: cache_production
      hosts: [[server3, 27017], [server4, 27017]]


To use namespacing, which we use for all our Mongoid Models, add the :class_name at the end of any references in the Mongoid model, for example:

module Cache
  class Owner
    include Mongoid::Document
    embeds_one   :inquiry,                   :class_name => 'Cache::Inquiry'