A Mongoose schema defines the structure of the document, default values, validators, etc., whereas a Mongoose model provides an interface to the database for creating, querying, updating, deleting records, etc.Ĭreating a Mongoose model comprises primarily of three parts: 1. ModelĪ Mongoose model is a wrapper on the Mongoose schema. Similarly, we have turned our Database class into a singleton by returning an instance of the class in the module.exports statement because we only need a single connection to the database.ĮS6 makes it very easy for us to create a singleton (single instance) pattern because of how the module loader works by caching the response of a previously imported file. On subsequent calls, it will return the same instance that was created and returned to you the first time because of how module import/export works in ES6. It means that the first time you call require(‘mongoose’), it is creating an instance of the Mongoose class and returning it. The require(‘mongoose’) call above returns a Singleton object. nnect(`mongodb://$`)Ĭonsole.log('Database connection successful')Ĭonsole.error('Database connection error') let mongoose = require('mongoose') Ĭonst server = '127.0.0.1:27017' // REPLACE WITH YOUR DB SERVERĬonst database = 'fcc-Mail' // REPLACE WITH YOUR DB NAME Your connection string will vary based on your installation. Next, we will add a simple class with a method that connects to the database. The Mongoose syntax in this article is specific to Mongoose v5 and beyond. The above install command will install the latest version of the libraries. Let’s install Mongoose and a validation library with the following command: npm install mongoose validator Let’s go to the project folder and initialize our project npm init -y Fire up your favorite IDE, create a blank project, and let’s get started! We will be using the limited ES6 syntax in Node, so we won’t be configuring Babel. I am using Visual Studio Code, Node 8.9, and NPM 5.6. Let’s navigate through some of the basics of Mongoose by implementing a model that represents data for a simplified address book.
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