adbanner-test/app/models/ad_image.rb

require 'uri'

class AdImage
  include Mongoid::Document
  include Mongoid::Timestamps

  mount_uploader :file, ImageUploader

  field :title, type: String, localize: true
  field :context, type: String, localize: true
  field :weight, type: Integer, default: 1
  field :out_link, type: String
  field :link_open, type: String
  LINK_OPEN_TYPES = ["local", "new_window"]

  belongs_to :banner

  before_validation :add_http
  validates :file, presence: true
  validates :out_link, format: { with: URI::regexp(%w(http https)) }, allow_blank: true
  validates :title, presence: true

  protected

  def add_http
    unless self.out_link.blank? || self.out_link[/^http:\/\//] || self.out_link[/^https:\/\//]
      self.out_link = 'http://' + self.out_link
    end
  end
end