announcement-test/app/models/bulletin_file.rb

# encoding: utf-8
class BulletinFile

  include Mongoid::Document
  include Mongoid::Timestamps

  mount_uploader :file, AssetUploader

  field :description, localize: true
  field :title, localize: true
  field :choose_lang, :type => Array, :default => ["en","zh_tw"]
  field :privacy_type, type: String, default: 'public'
  belongs_to :bulletin

  def file_title
    if self.description.present?
      return self.description
    elsif self.title.present?
      return self.title
    else
      return File.basename(self.file.path)
    end
  end
  def enabled_for?(lang)
  	if lang.nil?
  		return true
  	else
  		return self.choose_lang.include?(lang)
  	end
  end
  def can_access?(user)
    if user.nil? && self.privacy_type == 'logged_in'
      return false
    else
      return true
    end
  end
end