title: In Django, how do you make a model refer to itself?
body: <p>Assume we have class <code>Employee</code>. I want to have a field which references a different instance of the same class. </p>
  
  <p>How to write this? How about the following code?</p>
  
  <pre><code>ref_employee= models.ForeignKey('self',null=True,blank=True)
  </code></pre>