simple mongoid config to use with mongolab env.vars

mongoid.yml

development:
  # Configure available database sessions. (required)
  sessions:
    # Defines the default session. (required)
    default:
      # Defines the name of the default database that Mongoid can connect to.
      # (required).
      database: special_blog_development
      # Provides the hosts the default session can connect to. Must be an array
      # of host:port pairs. (required)
      hosts:
        - <%= ENV['MONGOLAB_URI'] %>
      database: <%= ENV['MONGOLAB_DB'] %>
      username: <%= ENV['MONGOLAB_USER'] %>
      password: <%= ENV['MONGOLAB_PASSWORD'] %>        
      options:
  options:
test:
  sessions:
    default:
      database: special_blog_test
      hosts:
        - localhost:27017
      options:
        read: primary
        # In the test environment we lower the retries and retry interval to
        # low amounts for fast failures.
        max_retries: 1
        retry_interval: 0
production:
  sessions:
    default:
      hosts:
        - localhost:27017
      database: special_blog