Using MongoDB in Graphback

MongoDB is a general purpose, document-based, distributed database built for modern application developers. Graphback MongoDB Provider package provides instant integration to your Mongo database, giving you a full implementation of the CRUD API.

The package is built on top of the official MongoDB Node.js Driver.

Installation

Install with npm:

npm install @graphback/runtime-mongo mongodb

Install with yarn:

yarn add @graphback/runtime-mongo mongodb

Running either of the two commands will install the Graphback MongoDB Provider (@graphback/runtime-mongo) and the MongoDB Driver (mongodb).

Creating Database Connection

You'll need a running MongoDB instance before initializing the connection.

info

If you do not have a running instance, you can use Docker to quickly spin up a MongoDB container by following the instructions given in MongoDB Docker Image.

The following code can be used to connect to your MongoDB.

import { Db, MongoClient } from "mongodb";

// Example Mongo Connection URL

const url = 'mongodb://localhost:27017';

const mongoClient: MongoClient = await MongoClient.connect(url);

// get db instance

const db: Db = mongoClient.db('users');

Here we are connecting to the users database, on a MongoDB instance running locally.

You can change the configurations variables to match the one you have.

To learn more about the accepted configuration, visit the MongoDB Driver Connection Options documentation.

Using MongoDB Provider

The Graphback MongoDB provider exposes a createMongoDbProvider method, which can be used to create data providers for each of your data models.

The code below shows how you can create such a data provider creator and how it can be passed to buildGraphbackAPI.

import { Db, MongoClient } from "mongodb";

import { buildGraphbackAPI } from 'graphback';

import { createMongoDbProvider } from '@graphback/runtime-mongo';

// Example Mongo Connection URL

const url = 'mongodb://localhost:27017';

const mongoClient: MongoClient = await MongoClient.connect(url);

// get db instance

const db: Db = mongoClient.db('users');

// create the MongoDB Data provider creator function

const dataProviderCreator = createMongoDbProvider(db);

// the business model

const userModel = `

"""

@model

"""

type User {

id: ID!

username: String!

}

`;

// Use the dataProvider in buildGraphbackAPI

const { resolvers, services, contextCreator } = buildGraphbackAPI(userModel, { dataProviderCreator });

The highlighted code does the following:

• Define connection URL to the MongoDB.
• Create a connection to our Mongo database.
• Select the users database.
• And finally, create a data provider creator by using the createMongoDbProvider API.

The rest of the code uses buildGraphbackAPI to create Graphback CRUD API based on the defined userModel model.

Visit Data Models to learn more about how to design your business models.