title: Django model inheritance and type check
body: <pre><code>class Machine(models.Model):
      name= models.CharField( max_length=120)
      class Meta:
          abstract = True
  
  class Car(Machine):
      speed = models.IntegerField()
  
  class Computer(Machine)
      ram = models.IntegerField()
  </code></pre>
  
  <p>My question is, how can I understand what type is the Machine model. For instamce I know the incoming query is a children of the Machine model but I also want to know it is a Car submodel.</p>