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module ModelHelpers

  def self.included(base)
    base.extended ClassMethods
  end

  module ClassMethods

    def textilize(*columns)
      methods = []
      suffix  = columns.last.is_a?(Hash) ? columns.pop.values.last : 'html'
			
      columns.each do |column|
        define_method "#{column}_to_html" do
          self["#{column}_#{suffix}"] = RedCloth.new(self[column] || '').to_html
        end
        methods << "#{column}_to_html".to_sym
      end
	
      methods.each { |method| before_save method }
    end

  end

end