add a santize :column_name to sanitize to html

gistfile1.rbx

include ActionView::Helpers::TagHelper, ActionView::Helpers::TextHelper, WhiteListHelper

module ActiveRecord
  class Base

    def self.sanitize(attr_name, options = {})
      define_method "#{attr_name}=" do |val|
        write_attribute attr_name, val

        html = ''

        val.strip! if val.respond_to?(:strip!)
        unless val.blank?
          # Turn URLs and e-mails into links
          html = auto_link(val)

          # Turn newlines into <p> or <br />
          html = unsimple_format(html)

          # Escape entities, remove bad tags and attributes/values
          html = white_list(html, {}) do |node, bad|
            if white_listed_bad_tags.include?(bad) then
              nil 
            else 
              node.to_s.gsub(/&(?!#?\w+;)/, '&').gsub(/</, '<') 
            end
          end
          html = wordwrap(html)
        end
        
        write_attribute "#{attr_name}_html", html
      end
    end

  end
end