This is demo code for my conference talk GraphQL vs Traditional REST API. It consists of simple REST end points and GraphQL end point, with MongoDB in backened.
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README.md

GraphQL vs Traditional REST API with MongoDB - Conference talk demo

This is demo code for my conference talk GraphQL vs Traditional REST API. I had two repos which are combined and improved in this one

How to start project

You can build java code and start it as stand alone app. In this case you need to provide MongoDB instance. Other way is to use docker-compose to start all needed dependencies as docker containers.

To build code just run

mvn clean package

to build code and created docker image run

mvn clean install

Stand alone Java applicatoin

java -jar target/graphql-vs-rest-0.0.6-SNAPSHOT.jar

If you want to also initalize some init data run with additiaonal paramater

java -jar target/graphql-vs-rest-0.0.6-SNAPSHOT.jar initdata

Using Docker compose

After you build code and docker image is created just run this command

docker-compose up

This will start two docker images. One with MongoDB database, other with Java application

REST End points

There are multipel REST end points that are exposed

Authours end point

to retrive all authours run this command

curl http://localhost:8080/authors

to retrieve info about specific author run this command

curl http://localhost:8080/authors/<author id>

Posts end point

to retrive all posts run this command

curl http://localhost:8080/posts

To retrieve all post from specific author run this command

curl http://localhost:8080/posts?author_id=<author id>

Comments end point

to retrive all comments run this command

curl http://localhost:8080/comments

To retrieve comments for specific port run this command

curl http://localhost:8080/comments?post_id=<post id>

GraphQL End point

GraphQL schema

Check full GraphQl schema here

Test with GraphiQL

Once application is up and running, hit http://localhost:8080/ with browser and you will get GraphiQL UI. Here you can enter queries and get back response

Basic query

Run this query

query {  
  allPosts {
    id
    title
    body
  }
}

Response should be something like this

{
  "data": {
    "allPosts": [
      {
        "id": "321",
        "title": "Who is Radial Edward",
        "body": "Edward Wong Hau Pepelu Tivrusky IV (エドワード・ウォン・ハウ・ペペル・チブルスキー4世 Edowādo Won Hau Peperu Chiburusukī 4-sei?), commonly called Ed, colloquially known as Radical Edward and born on January 1, 2058 as Françoise Appledelhi, is a child prodigy skilled in hacking originally from Earth. She is a comically-eccentric teenager around 13 years of age."
      },
      {
        "id": "543",
        "title": "Who is Son Goku",
        "body": "Son Goku (孫悟空 Son Gokū), born Kakarot (カカロット Kakarotto), is a male Saiyan and the main protagonist of the Dragon Ball meta-series created by Akira Toriyama. Cheerful, tenacious, and also a bit naïve, Goku is a Saiyan originally sent to Earth as an infant with the mission to destroy it. However, an accident alters his memory, causing him to grow up pure-hearted and later become Earth's greatest defender, as well as the informal leader of the Dragon Team. Throughout his life, he trains hard and constantly strives to be the greatest warrior possible and to fight stronger opponents, which has kept the Earth and the Universe safe from destruction many times"
      }
    ]
  }
}

Query filtering fields in response

Great thing about GraphQL is that you can select which fields should be present in response

run this query

query {  
  allPosts {
    id
    title
  }
}

and response should be like this

{
  "data": {
    "allPosts": [
      {
        "id": "321",
        "title": "Who is Radial Edward"
      },
      {
        "id": "543",
        "title": "Who is Son Goku"
      }
    ]
  }
}

Get Author data in response

Since now Author is part of Post in schema, we can request this info in our query

query {  
  allPosts {
   title
   createdBy {
    name
  } 
  }
}

should produce this response

{
  "data": {
    "allPosts": [
      {
        "title": "Who is Radial Edward",
        "createdBy": {
          "name": "Ed Wong IV"
        }
      },
      {
        "title": "Who is Son Goku",
        "createdBy": {
          "name": "Son Goku"
        }
      }
    ]
  }
}

Modify data throgh GraphQL

Now that Mutation is added to graphql schema, authers can be added and removed

Add Author

to add author run this query in GraphiQL

mutation {
  addAuthor(name:"New Author") {
    id
    name
  }
 }

response should be something like this

{
  "data": {
    "addAuthor": {
      "id": "5ac229d4857aba00078c565f",
      "name": "New Author"
    }
  }
}

Remove Author

to remove auhtour run command like this

mutation {
  removeAuthour(id: "123") {
    name
  }
}

response should be like this

{
  "data": {
    "removeAuthour": {
      "name": "Ed Wong IV"
    }
  }
}

TAGS

rest-0.1

REST points done

graphql-0.1

GraphQL end point with init GraphQL schema

graphql-0.2

Updated GraphQL schema, so that Author can be accessed through Post

graphql-0.3

Full GraphQL schema, with all resources connected were made sense

graphql-0.4

Added mutations to GraphQL, option to add and remove authors