title: update multiple rows in Rails 3.2
body: <p>I am trying to do this </p>
  
  <pre><code>User.find([23,45,68,123]).update_all(:is_active =&gt; true)
  </code></pre>
  
  <p>but I get:</p>
  
  <pre><code>NoMethodError: undefined method `update_all' for #&lt;Array:0x00000007493778&gt;
  </code></pre>
  
  <p>What would be the correct syntax? I would rather not iterate through each one if I don't have to.</p>