title: Rails options_for_select data from model plus additional array
body: <p>I have an array of membership types as a constant in my model:</p>
  
  <pre><code>class Advisor &lt; ActiveRecord::Base
    ACCOUNT_STATUSES = [ 'gold', 'bronze', 'silver', 'gold' ]
  end
  </code></pre>
  
  <p>in my admin i have a table of all advisors and i have a sorting select box above the "Membership Type" column, so admin can select an account status and it will filter the table. But i need additional option called "All" and with value "all". Here is what i have so far:</p>
  
  <pre><code>&lt;%= select_tag "search", options_for_select(["All", "all"] + Advisor::MEMBERSHIP_TYPES.collect{|m| [m.titleize, m]}) %&gt;
  </code></pre>
  
  <p>But it creates a select box with two "All" options : "All" and "all" - i need "all" as a value...What am i doing wrong?</p>
  
  <p>Thank you</p>