README

Environment

• java 11

How to test

Use Altair plugin

http://localhost:8085/graphql

Query operation

query{
  findAll{
    id
    url
    description
  }
}

Mutation operation

mutation{
  saveComment(id: 5, title: "FAQ ", createdAt: "2020/11/21 13:22:41")
}

Test Polymorphic type

• query interface

    query{
        findVehicle{
          __typename,
         ... on Car {
          id 
          enginePower
    			
        }
          ... on Van {
            id
            enginePower
            isOffRoad
          }
          
        }
      }
  

• Query output

    {
      "data": {
        "findVehicle": [
          {
            "__typename": "Van",
            "id": "Van100",
            "enginePower": "HP_3000",
            "isOffRoad": true
          },
          {
            "__typename": "Car",
            "id": "Car 120",
            "enginePower": "HP_1500"
          }
        ]
      }
    }
  

• Mutation on interface

    mutation{
      saveCar(id: "Preus 2008", enginePower: HP_1500)
    }
  

Test Pagination

• query operation

    query{
        books{
            edges{
                cursor
                node{
                   id
                   title
                   author
                }
            },
            pageInfo{
                  hasPreviousPage
                  hasNextPage
                  startCursor
                  endCursor
            }
        }
    }
  

• query output

   {
       "data": {
           "books": {
               "edges": [
                   {
                       "cursor": "c2ltcGxlLWN1cnNvcjA=",
                       "node": {
                           "id": "1245",
                           "title": "Jane Eyre",
                           "author": "Charlot Bronte"
                       }
                   },
                   {
                       "cursor": "c2ltcGxlLWN1cnNvcjE=",
                       "node": {
                           "id": "1285",
                           "title": "Village By the Sea",
                           "author": "Anita Desai"
                       }
                   },
                   {
                       "cursor": "c2ltcGxlLWN1cnNvcjI=",
                       "node": {
                           "id": "1259",
                           "title": "Mother",
                           "author": "Maximum Ghorky"
                       }
                   },
                   {
                       "cursor": "c2ltcGxlLWN1cnNvcjM=",
                       "node": {
                           "id": "1273",
                           "title": "Anne Frank huis",
                           "author": "Anne Frank"
                       }
                   }
               ],
               "pageInfo": {
                   "hasPreviousPage": false,
                   "hasNextPage": false,
                   "startCursor": "c2ltcGxlLWN1cnNvcjA=",
                   "endCursor": "c2ltcGxlLWN1cnNvcjM="
               }
           }
       }
   }
  

• paginated query operation

   query($first: Int, $after: String){
      books(first: $first, after: $after){
          edges{
             cursor
                 node{
                   id
                   title
                    author
                 }
             },
           pageInfo{
              hasPreviousPage
              hasNextPage
              startCursor
              endCursor
           }
  
     }
   }
  

• variables

   {
       "first": 3,
       "after": "c2ltcGxlLWN1cnNvcjA="  
   }
   
   a cursor value should be placed after the "after"
  

subscription operation

• use http://localhost:8085/graphiql in your browser to test subscriptions

     subscription {
       comments {
         id
         title
         createdAt
       }
     }
  

Ref :

https://graphql.org/learn/schema/

https://www.howtographql.com/graphql-java/9-filtering/

https://developer.okta.com/blog/2020/01/31/java-graphql

polymophic : https://medium.com/better-programming/using-graphql-with-spring-boot-interfaces-and-unions-a76f62d62867

client Library : https://ktor.io/docs/clients-index.html