title: How to determine if a record is just created or updated in after_save
body: <p>The #new_record? function determines if a record has been saved. But it is always false in the <code>after_save</code> hook. Is there a way to determine whether the record is a newly created record or an old one from update? </p>
  
  <p>I'm hoping not to use another callback such as <code>before_create</code> to set a flag in the model or require another query into the db.</p>
  
  <p>Any advice is appreciated. </p>
  
  <p>Edit: Need to determine it in <code>after_save</code> hook, and for my particular use case, there is no <code>updated_at</code> or <code>updated_on</code> timestamp</p>