ruby on rails - add class to collection_select -

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i've looked @ how set html options collection_select in rails? , i'm sure i'm missing obvious, can't work.

my select looks like:

  <%= f.collection_select :broadcast_id, broadcasts, :id, :to_s,     :include_blank => 'broadcast on...' %>

and i've tried including :class => 'prevent_collapse', nothing, {:class => 'prevent_collapse'}, gives me error.

if can point out how this, i'll super grateful!

collection_select(object, method, collection, value_method, text_method, options = {}, html_options = {}) => f.collection_select :broadcast_id, broadcasts, :id, :to_s, {:include_blank => 'broadcast on...'}, {:class => 'prevent_collapse'}

and error have?

and broadcast item has got :to_s method? return class name, think.


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