Book Image

The Node Craftsman Book

By : Manuel Kiessling
Book Image

The Node Craftsman Book

By: Manuel Kiessling

Overview of this book

The Node Craftsman Book helps JavaScript programmers with basic Node.js knowledge to now thoroughly master Node.js and JavaScript. This book dives you deeper into the craft of software development with Node.js and JavaScript, incuding object-orientation, test-driven development, database handling, web frameworks, and much more. The Node Craftsman Book shows you how to work with Node.js and how to think deeply about how you build your Node projects. You'll master how to build a complete Node.js application across six crafting milestones, and you'll learn many specific skills to achieve that mastery. These skills include how to work with the Node Package Manager in depth, how to connect your Node applications to databases, and how to write unit tests and end-to-end tests for your code. You'll experience the full Node.js development picture, and learn how to craft and control your Node.js applications - right through to fully-fledged web applications using REST, and integration with Angular applications.
Table of Contents (17 chapters)
Free Chapter
1
Part 1: Node.js Basics in Detail
2
Working with NPM and Packages
3
Test-driven Node.js Development
11
Milestone 1 – A First Passing Test Against the Server
13
Milestone 3 – Setting the Stage for a Continuous Delivery Workflow

Retrieving specific documents using filters

We have not yet performed any truly interesting queries against our collection. Up until now, all we did was to retrieve all documents contained in our collection by performing collection.find() without any filter. More complex filters are available of course.

Let's rewrite the existing code in order to retrieve only specific documents in our doFind function. First, a very simple example we are going to retrieve all documents where the v attribute has a value of 5. Let's change the following line:

collection.find().toArray(function (err, documents) {

The preceding line is changed to:

collection.find({'v': 5}).toArray(function (err, documents) {

The preceding changes result in only the matching documents being printed:

Inserted 20 documents:
[ { id: 53d7698d99c6107303ad204c, n: '#8', v: 5 }, 
{ id: 53d7698d99c6107303ad2050, n: &apos...