title: Ordering by String that starts with Number - ActiveRecord
body: <p>I'm building Rails app and trying to order records in database by string column that starts with number.<br />
  How can I order by the number at first?<br />
  I'd rather ordering as SQL order than sorting by ruby method. Is there any way?</p>
  <pre><code>expected order
  1.record1
  2.record2
  10.record10
  </code></pre>
  <pre><code>present order
  1.record1
  10.record10
  2.record2
  </code></pre>