UserSchema Design

Now we have learned why we need to use Schema and how we can define a schema, we will start to work on that in our Smilecook application. In the case of user registration, we will expect the user to fill in their information on a web form, and then send the details in JSON format to the server. Our Smilecook application will then deserialize it to be a User object, which can be worked on in our application.

We will, therefore, need to define a UserSchema class to specify the expected attributes in the JSON request coming from the frontend. We will need the following fields:

• id: Use fields.Int() to represent an integer. In addition, dump_only=True means that this property is only available for serialization, not deserialization. This is because id is autogenerated, not passed in by the user.
• username: Use fields.String() to represent a string and apply required=True to indicate that this property is mandatory. When the client sends JSON data without...