title: Ruby on Rails: updated_at - set as 0 on creation
body: <p>When I create a new record on <code>query</code> table, I want <code>updated_at</code> (timestamp) to be '0000-00-00 00:00:00' - and not the current timestamp, as Ruby on Rails sets by default.</p>
  
  <p>MySQL field:</p>
  
  <pre><code>`updated_at` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00' ON UPDATE CURRENT_TIMESTAMP
  </code></pre>
  
  <p>However, Ruby on Rails generates this sql query:</p>
  
  <pre><code>INSERT INTO `queries` (`updated_at`) VALUES ('2011-01-04 17:40:15')
  </code></pre>
  
  <p>How do I fix this?</p>