Building RESTful Python Web Services

Creating a schemas to validate, serialize, and deserialize users

Now, we will create the Flask-Marshmallow schema that we will use to validate, serialize and deserialize the previously declared User model. Open the api/models.py file and add the following code after the existing lines. The code file for the sample is included in the restful_python_chapter_07_02 folder:

class UserSchema(ma.Schema): 
    id = fields.Integer(dump_only=True) 
    name = fields.String(required=True, validate=validate.Length(3)) 
    url = ma.URLFor('api.userresource', id='<id>', _external=True) 

The code declares the UserSchema schema, specifically a subclass of the ma.Schema class. Remember that the previous code we wrote for the api/models.py file created a flask_marshmallow.Mashmallow ...