"mongodb_cr" is invalid, please use mongodb_cr, mongodb_x509, gssapi or plain.

development:
  clients:
    default:
      database: urijijami
      hosts:
        - <%= ENV['MONGO_HOST'] || 'localhost' %>
      options:
        user: <%= ENV['MONGO_USER'] %>
        password: <%= ENV['MONGO_PASS'] %>

        # Change the default authentication mechanism. Valid options are: :scram,
        # :mongodb_cr, :mongodb_x509, and :plain. Note that all authentication
        # mechanisms require username and password, with the exception of :mongodb_x509.
        # Default on mongoDB 3.0 is :scram, default on 2.4 and 2.6 is :plain.
        auth_mech: mongodb_cr

  # Configure Mongoid specific options. (optional)
  options:
    raise_not_found_error: false

auth_mech: :mongodb_cr