Having a play with mongomapper and wanted to get Clearance working with it. Seemed to just be a simple case of doing the following in my user model.

  def self.attr_accessible(*args)end
  include Clearance::User

My full user model ended up looking like this:

  class User

    include MongoMapper::Document

    def self.attr_accessible(*args)end
    include Clearance::User

    key :email, String
    key :encrypted_password, String
    key :salt, String
    key :confirmation_token, String
    key :remember_token, String
    key :firstname, String
    key :email_confirmed, Boolean
    key :lastname, String

    timestamps!

  end

Perhaps if I have time, I will look into adding attr_accessible support to mongomapper myself.