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Nest.js: A Progressive Node.js Framework

You're reading from   Nest.js: A Progressive Node.js Framework Hit the ground running with Nest.js

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Product type Paperback
Published in Nov 2019
Publisher Packt
ISBN-13 9781800204737
Length 317 pages
Edition 1st Edition
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Authors (6):
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Greg Magolan Greg Magolan
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Greg Magolan
Patrick Housley Patrick Housley
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Patrick Housley
Backstop Media LLC Backstop Media LLC
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Backstop Media LLC
Adrien de Peretti Adrien de Peretti
Author Profile Icon Adrien de Peretti
Adrien de Peretti
Jay Bell Jay Bell
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Jay Bell
David Guijarro David Guijarro
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David Guijarro
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Toc

Table of Contents (16) Chapters Close

Preface
1. Introduction FREE CHAPTER 2. Overview 3. Nest.js authentication 4. Dependency Injection system of Nest.js 5. TypeORM 6. Sequelize 7. Mongoose 8. Web sockets 9. Microservices 10. Routing and request handling in Nest.js 11. OpenAPI (Swagger) Specification 12. Command Query Responsibility Separation (CQRS) 13. Architecture 14. Testing 15. Server-side Rendering with Angular Universal

Chapter 12. Command Query Responsibility Separation (CQRS)

Up to this point in this book, we have worked to put together a simple blog application using the CRUD pattern: Create, Retrieve, Update, and Delete. We have done an excellent job of ensuring services are handling our business logic and our controllers are simply gateways into those services. The controllers take care of validating the request and then pass the request to the service for processing. In a small application like this, CRUD works wonderfully.

But what happens when we are dealing with a large scale application that may have unique and complex business logic for saving data? Or maybe we would like to initiate some logic in the background so the UI is able to call APIs without having to wait for all the business logic to finish. These are areas where CQRS makes sense. CQRS can be used to isolate and break apart complex business logic, initiate that business logic synchronously or asynchronously, and compose the isolated...

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