title: How do I allow a user to select zero options from a multiple selection box in rails?
body: <p>I have a settings model with a column <code>options</code>, and set it to serialize with <code>serialize :options</code>.  In my view, I have a multiple selection box, using <code>select("settings", "options", ['option1','option2','option3'], {}, :multiple =&gt; true)</code> which works fine so long as the user selects at least one option.  However, if they don't select any options, no options are submitted and so the options aren't updated.</p>
  
  <p>How do I allow the user to select zero options from a multiple selection box in rails?</p>