book

Mongoose for Application Development

Name: Mongoose for Application Development
Author: Simon Holmes
ISBN: 9781782168195

by Simon Holmes

August 2013

Intermediate to advanced

142 pages

2h 42m

English

Packt Publishing

Read now

Unlock full access

Mongoose for Application Development
Table of Contents
Mongoose for Application Development
Credits
About the Author
About the Reviewers
www.PacktPub.com
Support files, eBooks, discount offers and moreWhy Subscribe?Free Access for Packt account holders
Preface
What this book covers
What you need for this book
Who this book is for

Conventions
Reader feedback
Customer support
Downloading the example codeErrataPiracyQuestions
1. Introducing Mongoose to the Technology Stack
The technology stack – Node.js, npm, MongoDB, and ExpressThe language and the server – JavaScript and NodeSingle-threaded versus multithreadedBlocking versus non-blocking codeJavaScript callbacksRunning the callbackA Node.js exampleThe database – MongoDBThe framework – Express
What Mongoose is all about
What is Mongoose good for?What Mongoose is not ideally suited forThe cornerstones of MongooseMongoose schemasMongoose models
Installing the full stack
Installing the prerequisitesInstalling Node.jsInstalling npmInstalling MongoDBInstalling Express.jsInstalling MongooseDirect installation into projectUsing project dependencies – package.jsonCreating a project
Summary
2. Establishing a Database Connection
Mongoose default connectionUsing multiple connections
About the connection string
Setting the portSpecifying a database user
Connection options
Closing the connection
Calling the close commandClosing when the Node process ends
Connection events
Connecting our project
Creating the connectionCatching the eventsOpening the connection at application startCreating the database
Summary
3. Schemas and Models
Introducing schemasField sizes
Data types allowed in schemas
StringNumberDateBooleanBufferObjectIdMixedTracking changes to Mixed typeArrayWarning – array defined as mixed typeCustom SchemaTypes
Where to write the schemas
Writing a schema
Modifying an existing schemaSetting a default valueOnly allowing unique entriesOur final User schemaWhat's that "__v" thing?Why is this needed?Defining the Project schemaImproving the Project schema
Building models
InstancesInteracting with instancesFinding a single instanceFinding many instancesConsiderations when choosing your model name
Setting the collection name
Overriding the collection name in the schemaOverriding the collection name in the modelBuilding models from our schemas
Our complete code
Summary
4. Interacting with Data – an Introduction
Model methods and instance methods
Setting up the project
Code structureAdding the routes filesTying the routes to Mongoose modelsURLs and routesRoutes for user managementRoutes for project management
Summary
5. Interacting with Data – Creation
Creating an instanceAdding data to the instance
Saving an instance
Using the saved data
Creating and saving database entry in one step
Chaining methodsThe Model.create() method
CRUD – create data
Adding a new user formAdding the Jade templateLinking the view to the URLAdding the create user functionError trappingCreating a user sessionDisplaying the confirmation pageTry it out!Adding create project functionalityRoutesNew files and functions
Summary
6. Interacting with Data – Reading, Querying, and Finding
Approaches to find and read dataUsing the QueryBuilderSingle query operationStatic helper methods – finding data
CRUD – reading user and project data
findOne() – finding a single userLogin formLogin actionHousekeeping – adding homepage linksTry it out!find() – finding a list of projects and returning JSON to AJAXCreating a new static find methodSetting up the routeUpdating the viewBuilding the AJAX callTry it out!findByld() – finding a single projectRoute setupCreating the view
Summary
7. Interacting with Data – Updating
Model helper methodsBuilding the commandsWhich method to chooseThe catch
The three-step find-edit-save approach
CRUD – editing users and projects
Tracking user loginEditing the current userRoutes in useSetting up the formSetting up the controllersCommitting the editEditing projectsRoutesNew files and functions
Summary
8. Interacting with Data – Deleting
Deleting data
CRUD – deleting user and projects
The "Are you sure" pageDeleting the userImproving on thisDeleting individual projectsRoutesNew files and functions
Summary
9. Validating Data
Mongoose validation – the basicsDefault validatorsAll SchemaTypesNumber SchemaTypeString SchemaType
Understanding validation errors
Doing it your way – create custom validation
Single function – no custom error messageReturning a custom error messageValidating a regular expressionTaking the messages out of the schemaUsing multiple re-usable validatorsNon-blocking, asynchronous validationExtending Mongoose validation
Adding validation to our project
Summary
10. Complex Schemas
Population – references to other collectionsDefining data for populationSaving population referencesRetrieving populated dataQuerying to return a subset of resultsPopulating into multiple parent items
Subdocuments
Creating subdocumentsSaving and validationRetrieving subdocumentsAccessing a specific subdocumentDeleting subdocuments
Data management when modifying existing schemas
Summary
11. Plugins – Re-using Code
Reusable schema pluginsCreating a schema pluginApplying the plugin to an existing schemaUsing an external fileUsing schema middlewareNot just for plugins
Sharing with the community
Summary
Index

Content preview from Mongoose for Application Development

Data types allowed in schemas

There are eight types of data that can—by default—be set in a Mongoose schema. These are also referred to as SchemaTypes; they are:

String
Number
Date
Boolean
Buffer
ObjectId
Mixed
Array

The first four SchemaTypes are self-explanatory, but let's take a quick look at them all.

String

This SchemaType stores a string value, UTF-8 encoded.

Number

This SchemaType stores a number value, with restrictions. Mongoose does not natively support long and double datatypes for example, although MongoDB does. However, Mongoose can be extended using plugins to support these other types. See Chapter 11, Plugins – Re-using Code for more on plugins.

Date

This SchemaType holds a date and time object, typically returned from MongoDB as an ISODate object, ...

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.

Read now

Unlock full access

More than 5,000 organizations count on O’Reilly

O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.

Julian F.

Head of Cybersecurity

I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.

Addison B.

Field Engineer

I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.

Amir M.

Data Platform Tech Lead

I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.

Mark W.

Embedded Software Engineer

Publisher Resources

ISBN: 9781782168195Other

Cloud Computing

Data Engineering

Data Science

AI & ML

Programming Languages

Software Architecture

IT/Ops

Security

Design

Business