stupid_arrange.rb

  def self.stupid_arrange
    arranged = ActiveSupport::OrderedHash.new
    self.sorted.where(depth: 0).each do |item|
      arranged[item] = []
    end

    self.sorted.where(depth: 1).each do |item|
      if key = arranged.find{ |k, _| k.id == 54 }.first
        arranged[key].push(item)
      end
    end

    arranged
  end