reactrb/reactive-record

class ActiveRecord::Base

  def self.to_sync(scope_name, opts={}, &block)
    watch_list = if opts[:watch]
      [*opts.delete[:watch]]
    else
      [self]
    end
    if RUBY_ENGINE=='opal'
      watch_list.each do |klass_to_watch|
        ReactiveRecord::Base.sync_blocks[klass_to_watch][self][scope_name] << block
      end
    else
      # this is where we put server side watchers in place to sync all clients!
    end
  end

end