title: Do data conversion after Django model object is fetched
body: <p>I want to save the python dictionary inside the Django model as JSON and I want to convert that JSON back into a python dictionary when that data is fetched.</p>
  <p>I know I can do it inside view but I want to implement it in the model so it can return dictionary object when queried.</p>
  <p>is there any signal or any post_fetch method that I can use to achieve it, I couldn't find anything googling it...</p>