GraphQL-spring-boot

Attempt to use GraphQL java library to build GraphQL server using spring boot.MongoDB is used as a storage.

Schema for GraphQL (SDL)

resources/schema.graphqls contains GraphQL schema defination for query,resolver and types

Unit tests runs using gradle clean test
Make sure you have mongo installed on your machine.App will connect on port 27017 by default.
Start mongoDB using mongo command.
Embedded tomcat of spring boot starts using gradle bootRun

Fetch all blogs : http://localhost:8080/graphql POST Endpoint. Request body format : { "query": "{allBlogs{title}}" }
It sounds little stupid here to fetch all blogs using POST http method but it is used so we can pass query as a part of request body. We can change is to GET and pass actual query as query param.
Resonse that you will get is : { "allBlogs": [ { "title": "REST in peace.GraphQL live long" }, { "title": "Kotlin for Android" } ] }
Lets add one more parameter to request body i.e content { "query": "{allBlogs{title content}}" }
Response : { "allBlogs": [ { "title": "REST in peace.GraphQL live long", "content": "GraphQL dominating now days" }, { "title": "Kotlin for Android", "content": "how useful is kotlin for android dev" } ] }

GraphQL provides feature of Mutation which let us create new enitity.
Create Blog: http:/localhost:8080/graphql. Request Body: { "query": "mutation createBlog {createBlog(title:\"hello\",content:\"world\") {title content}}" }
Response: { "createBlog": { "title": "hello", "content": "world" } }
If you now again Query all blogs response would be { "allBlogs": [ { "title": "REST in peace.GraphQL live long", "content": "GraphQL dominating now days" }, { "title": "Kotlin for Android", "content": "how useful is kotlin for android dev" }, { "title": "hello", "content": "world" } ] }