title: Django ORM, filtering objects by type with model inheritence
body: <p>So I have two models...</p>
  
  <p>Parent and Child.</p>
  
  <p>Child extends Parent.</p>
  
  <p>When I do</p>
  
  <p>Parent.objects.all(), I get both the Parents and the Children.</p>
  
  <p>I only want Parents</p>
  
  <p>Is there a Parent.objects.filter() argument I can use to only get the Parent objects instead of the objects that extend parent?</p>