trash.rb

class Trash
  include Mongoid::Document

  field(:type => String)
  field(:data => Hash)

  index(:type => 1)


  def Trash.destroy(document)
    create(
      :type => document.class.name,
      :data => document.as_document
    )
  end

  def Trash.destroy!(document)
    destroy(document)
  ensure
    document.destroy
  end

  def undestroy
    model = eval(type)

    if model.respond_to?(:undestroy)
      model.undestroy(data)
    else
      doc = model.new
      data.each do |attr, value|
        doc.write_attribute(attr, value)
      end
      if doc.save
        destroy
        doc
      else
        false
      end
    end
  end

  def Trash.undestroy_all(&block)
    results = []

    all.each do |trash|
      result = trash.undestroy
      block ? block.call(result) : results.push(result)
    end

    block ? nil : results
  end

  def Trash.empty!
    destroy_all
  end
end