Rails 3 two selects with the same options but keep values unique -

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i trying figure out how deal 2 select boxes same options (i using formtastic gem) , force unique values. example:

  <select name="departure" size="1">     <option value="1">ny</option>     <option value="2">fl</option>     <option value="3">la</option>   </select>    <select name="arrival" size="1">     <option value="1">ny</option>     <option value="2">fl</option>     <option value="3">la</option>   </select>

the simplest way use jquery, know if there validation option in rails 3 handle such scenario. in advance!

you'll have write own think.

validate :departure_cant_equal_arrival  def departure_cant_equal_arrival   if departure.present? , arrival.present? , (departure == arrival)     errors.add(:arrival, "can't same departure")   end end

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