title: How to get upcoming row id - rails
body: <p>For example, the lastest row id is 100. I insert a new row and then delete it and then insert again. The row id is gonna be 102. How can I get that number 102 before inserting a new row. </p>
  
  <p>Note: <code>Model.maximum(:id).next</code> only gives me 101.</p>