Check for 'http' or 'https' before saving a link

app/models/ad_image.rb

@@ -26,6 +26,9 @@ class AdImage
   # validates_format_of :out_link, with: /(http:\/\/.*|)/ ,:message => 'Need a valid URL'
   attr_reader :parse_post_date,:parse_unpost_date
 
+  before_validation :add_http
+  validates :out_link, :presence => true, :format => /^(http|https):\/\/[a-z0-9]+([\-\.]{1}[a-z0-9]+)*\.[a-z]{2,5}(([0-9]{1,5})?\/.*)?$/ix
+
   def parse_post_date=(att)
     self.post_date = (Date.parse att.gsub(/\s+/, "") rescue nil)
   end
@@ -52,4 +55,12 @@ class AdImage
     end
     time
   end
+
+  protected
+
+  def add_http
+    unless self.out_link[/^http:\/\//] || self.out_link[/^https:\/\//]
+      self.out_link = 'http://' + self.out_link
+    end
+  end
 end