title: django model field check instance
body: <p>I have a models like</p>
  
  <pre><code>class MyModel(models.Model):
      name = models.CharField()
      updated_on = models.DateTimeField()
  </code></pre>
  
  <p>Now I am querying this like</p>
  
  <pre><code>m = MyModel.objets.get(id=2)
  </code></pre>
  
  <p>Here I want to check if the field is of certain type I want to do some stuff like</p>
  
  <pre><code>from django.db.models import DateTimeField
  
  if isinstance(m.updated_on, DateTimeField):
      // do something
  </code></pre>
  
  <p>But here I am getting false. 
  Is there any workaround by which I can achieve this ??</p>