trustieforge/app/models/zip_pack.rb

class ZipPack < ActiveRecord::Base
  # attr_accessible :title, :body

  def self.packed?(bid_id, user_id, digests)
    zip_pack = ZipPack.where(homework_id: bid_id, user_id: user_id).first
    return false unless zip_pack && zip_pack.digests ==  digests
    zip_pack
  end

  def file_valid?
    return false unless File.exist?(self.file_path)
    Trustie::Utils.digest(self.file_path) == self.file_digest
  end

  def digests
    self.file_digests.split(',').sort
  end
end