title: Why is GORM not saving my object?
body: <p>If I execute this code in the Grails console:</p>
  
  <pre><code>def p = new Post(title: "T");
  p.save(flush: true); // or p.save();
  
  Post.count();
  </code></pre>
  
  <p>GORM is not throwing any exceptions, but the data is not saved in my DB. What am I doing wrong?</p>