GraphQL Node JS Sample Implementation

This is a trivial implementation of NodeJS/Express Server to demo GraphQL in a Node environment, and to setup a simple programming task.

Project Setup

In the project directory, run:

npm install

npx nx serve api

To stop the server - ctl-c

Task

Implement the following graphQL query and mutations in the master router:

• getFooByID(id: String): Foo
• createFoo(fooInput: FooInput) - You will need to define FooInput
• createBar(barInput: BarInput) - You will need to define BarInput

Where:

type Foo = {
   id: string;
   name: string;
   bars: Bar[]
} 

type Bar = {
   id: string;
   name: string;
   description: string;
}

Simulate the DB backend with a class manipulating local array. The server should be able to generate a schema for the end point, and appropriately handle normal cases for these mutations.

Solution should be built in the graphql directory. The directory should have a minimum of the following files:

• schema.graphql - GraphQL Schema File for type definitions
• foo.resolver.ts - Typescript Resolver definitions
• mock-db-service.ts - Simple Typescript class mocking database calls and maintaining state (via simple array)

If you wish to break the logic in these three files into multiple files, that is perfectly acceptable.

Resources:

• https://www.graphql-tools.com/docs/introduction - use this library to build the schema/resolvers
• https://graphql.org/
• https://nx.dev/getting-started/intro - This sample uses NX to organize the application. If you want better knowledge of how interact with the tooling, this resource should get you started