title: Rails pass id in selection instead of string
body: <p>I have a select form:        </p>
  
  <pre><code>&lt;%= f.select :business_name,  options_for_select(Client.uniq.pluck(:business_name)),{:include_blank =&gt; false},{:multiple=&gt;true} %&gt;
  </code></pre>
  
  <p>It picks out the <strong>distinct</strong> <code>business_name</code> and renders them in a selection box. I need the form to send the relevant <code>business_id</code> when a <code>business_name</code> is selected instead of sending the name string.</p>
  
  <p>How do I achieve this?</p>