Mongoid random document

Question

Lets say I have a Collection of users. Is there a way of using mongoid to find n random users in the collection where it does not return the same user twice? For now lets say

Answer 1

Since I want to keep a criteria, I do:

scope :random, ->{
  random_field_for_ordering = fields.keys.sample
  random_direction_to_order = %w(asc desc).sample
  order_by([[random_field_for_ordering, random_direction_to_order]])
}