FIrst stab at listing, then eventually replacing unifi names in the database.

list_unifi_names.rb

#!/usr/bin/env ruby

require 'mongo'

begin
  conn = Mongo::Connection.new('localhost', 27117,{})
  db   = conn['ace']
  db.collections.each do |collection|
    if collection.name == 'user'
      #puts collection.find(name: 1).inspect
      collection.find().each do |doc|
        puts doc['hostname'] unless doc['hostname'].nil?
        puts doc['mac']
        puts doc['oui'] unless doc['oui'].nil?
      end
    end
  end
  conn.close
rescue StandardError => err
  puts('Error: ')
  puts(err)
end