If you can use collection_select instead of options_from_collection_for_select then this code works well for me
<%= collection_select(:air, :id, @airlines, :id, :airline_name, {:include_blank => true, :selected => nil}) %>
If you can use collection_select instead of options_from_collection_for_select then this code works well for me
<%= collection_select(:air, :id, @airlines, :id, :airline_name, {:include_blank => true, :selected => nil}) %>