prepend.rb

before_validation :smart_url_field
  protected
    def smart_url_field
      ["website","facebook_url","twitter_url","soundcloud_url"].each do |check|
        self["#{check}"] = "http://#{self["#{check}"]}" unless self["#{check}"][/\Ahttp:\/\//] || self["#{check}"][/\Ahttps:\/\//] || !self["#{check}"].presence
      end
    end