How to add fields to an existing model dynamically? Also how to modify existing field of a model dynamically?

Hi,
I am new to Django and Python!.
I am using Django 1.8.3 along with Python 3.2 and using sqlite as the database.
I am trying to setup a site using Django wherein the model is created dynamically( For eg: a Medical form)
The fields of the form are stored in db and the model created dynamically (reference: https://github.com/willhardy/dynamic-models)
The admin guys can modify the fields of this medical form from the admin site. At this time, I would like to modify the model to match the schema modifications done by admin guys.
I understand prior  to Django 1.7, there was django.db.models.loading module that helped in this.

With the current version of Django, how can I add/modify/delete the fields of the dynamic model dynamically?

Your help and suggestions are most welcome.

Regards,
Srinivasa Pradeep

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