Book Image

Building RESTful Python Web Services

By : Gaston C. Hillar
Book Image

Building RESTful Python Web Services

By: Gaston C. Hillar

Overview of this book

Python is the language of choice for millions of developers worldwide, due to its gentle learning curve as well as its vast applications in day-to-day programming. It serves the purpose of building great web services in the RESTful architecture. This book will show you the best tools you can use to build your own web services. Learn how to develop RESTful APIs using the popular Python frameworks and all the necessary stacks with Python, Django, Flask, and Tornado, combined with related libraries and tools. We will dive deep into each of these frameworks to build various web services, and will provide use cases and best practices on when to use a particular framework to get the best results. We will show you everything required to successfully develop RESTful APIs with the four frameworks such as request handling, URL mapping, serialization, validation, authentication, authorization, versioning, ORMs, databases, custom code for models and views, and asynchronous callbacks. At the end of each framework, we will add authentication and security to the RESTful APIs and prepare tests for it. By the end of the book, you will have a deep understanding of the stacks needed to build RESTful web services.
Table of Contents (18 chapters)
Building RESTful Python Web Services
Credits
About the Author
Acknowledgments
About the Reviewer
www.PacktPub.com
Preface

Creating models with their relationships


Now, we will create the models that we can use to represent and persist the message categories, messages, and their relationships. Open the api/models.py file and replace its contents with the following code. The lines that declare fields related to other models are highlighted in the code listing. In case you created a new virtual environment, create a new models.py file within the api folder. The code file for the sample is included in the restful_python_chapter_06_01 folder:

from marshmallow import Schema, fields, pre_load 
from marshmallow import validate 
from flask_sqlalchemy import SQLAlchemy 
from flask_marshmallow import Marshmallow 
 
 
db = SQLAlchemy() 
ma = Marshmallow() 
 
 
class AddUpdateDelete():    
    def add(self, resource): 
        db.session.add(resource) 
        return db.session.commit() 
 
    def update(self): 
        return db.session.commit() 
 
    def delete(self, resource): 
        db.session.delete(resource) 
 ...