method is not useful for me because I have a lot of different (dynamic) connection settings and can't store all of them in 

 file.

I've added this code to my initializer:

    module Mongoid::Collections
        module ClassMethods
            def on(options = {})
                options.symbolize_keys!
                conn = Mongo::Connection.new(options[:host], options[:port])
                db = conn[options[:database]]
                auth = db.authenticate(options[:username], options[:password])
                self._collection = Mongoid::Collections::Master.new(db, self.collection_name)
                self
            end
        end
    end

I have simple user model like this (nothing special here):

    class User
        include Mongoid::Document
        include Mongoid::Timestamps
        field :name, :type => String
        field :age, :type => Integer
    end

And there is my controller:

    class UsersController < ApplicationController
        def index
            # options look like this but actually I get them dynamically using other methods
            connection_options = { :host => 'example.com', :port => 10074, :username => 'user', :password => 'pass', :database => 'dbname' }
            @users = User.on(connection_options).order_by([:created_at, :desc]).all
        end
    end

It works fine except one problem – @users is array of 

 instances insted of