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Nest.js: A Progressive Node.js Framework

You're reading from  Nest.js: A Progressive Node.js Framework

Product type Book
Published in Nov 2019
Publisher Packt
ISBN-13 9781800204737
Pages 317 pages
Edition 1st Edition
Languages
Authors (5):
Greg Magolan Greg Magolan
Profile icon Greg Magolan
Patrick Housley Patrick Housley
Profile icon Patrick Housley
Adrien de Peretti Adrien de Peretti
Profile icon Adrien de Peretti
Jay Bell Jay Bell
Profile icon Jay Bell
David Guijarro David Guijarro
Profile icon David Guijarro
View More author details

Table of Contents (16) Chapters

Preface
1. Introduction 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

Modelling our data

Probably the best thing about using an ORM is that you can take advantage of the modelling abstraction that they provide: basically, they allow us to think about our data and to shape it with properties (including types and relations), generating “object types” (and plugging them to databases tables) that we can then use and manipulate as direct interfaces.

This abstraction layer saves you from writing database-specific code like queries, joins, etc. A lot of people love not having to struggle with selects and the like; so this abstraction layer comes in handy.

Our first entity

When working with TypeORM, this object abstractions are named entities.

An entity is basically a class that is mapped to a database table.

With that said, let’s create our first entity, which we will name Entry. We will use this entity to store entries (posts) for our blog. We will create a new file at src/entries/entry.entity.ts; that way TypeORM will be able to find...

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