Creating models for diverse content

We plan to add different types of content to the course modules such as texts, images, files, and videos. We need a versatile data model that allows us to store diverse content. In Chapter 6, Tracking User Actions, you have learned the convenience of using generic relations to create foreign keys that can point to objects of any model. We are going to create a Content model that represents the modules' contents and define a generic relation to associate any kind of content.

Edit the models.py file of the courses application and add the following imports:

from django.contrib.contenttypes.models import ContentType
from django.contrib.contenttypes.fields import GenericForeignKey

Then, add the following code to the end of the file:

class Content(models.Model):
    module = models.ForeignKey(Module,
                               related_name...