title: django manytomany filter question
body: <p>Hay,</p>
  
  <p>I have a Model which looks like this</p>
  
  <pre><code>class Person(models.Model):
      name = models.CharField(blank=False, max_length=100)
      friends = models.ManyToManyField('self', blank=True, null=True)
  </code></pre>
  
  <p>How would i filter out a Person how has friends?</p>
  
  <p>I tried</p>
  
  <pre><code>people_with_friends = Person.objects.filter(friends=True)
  </code></pre>
  
  <p>but had no luck.</p>
  
  <p>Anyone lend a helping hand?</p>
  
  <p>Thanks</p>