So far, our RESTful API has performed CRUD operations on a simple in-memory dictionary that acted as a data repository. The dictionary is never persisted and, therefore, the data is lost whenever we restart our Flask development server.
Now, we want to create a more complex RESTful API with Flask RESTful to interact with a database model that allows us to work with notifications that are grouped into notification categories. In our previous RESTful API, we used a string attribute to specify the notification category for a notification. In this case, we want to be able to easily retrieve all the notifications that belong to a specific notification category and, therefore, we will have a relationship between a notification and a notification category.
We must be able to perform CRUD operations on different related...
