Creating a model mixin to handle generic relations

Aside from normal database relationships, such as a foreign-key relationship or a many-to-many relationship, Django has a mechanism to relate a model to an instance of any other model. This concept is called generic relations. For each generic relation, there is a content type of the related model that is saved, as well as the ID of the instance of that model.

In this recipe, we will look at how to abstract the creation of generic relations in the model mixins.

Getting ready

For this recipe to work, you will need to have the contenttypes app installed. It should be in the INSTALLED_APPS directory, by default, as shown in the following code:

# settings.py or config/base.py
INSTALLED_APPS...