ruby on rails - RoR - Select tag with include_blank disable -

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i want result :

<select dir="rtl">   <option selected disabled>choose car</option>   <option value="volvo">volvo</option>   <option value="saab">saab</option>   <option value="mercedes">mercedes</option>   <option value="audi">audi</option> </select>

with following code can end :

<%= f.select(:car, xxxxxx, {:include_blank => 'choose car', :disabled => 'choose car'}) %>

=>

<select id="xxx" name="xxx">   <option value="">choose car</option>   <option value="volvo">volvo</option>   <option value="saab">saab</option>   <option value="mercedes">mercedes</option>   <option value="audi">audi</option> </select>

the first option not disabled...

i believe looking below:

<%= f.select(:car, xxxxxx, {:include_blank => 'choose car', :disabled => 1}) %>

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