server.md

Build a Books Server

1. Start a new CodeSandbox

2. Select a new Apollo Server project

3. Update the schema:

   const typeDefs = gql`
     type Book {
       title: String
       author: String
     }
   
     type Query {
       books: [Book]
       hello: String
     }
   `;

4. Add a books constant:

   const books = [
     {
       title: "The Awakening",
       author: "Kate Chopin"
     },
     {
       title: "City of Glass",
       author: "Paul Auster"
     }
   ];

5. Add a new Query resolver:

   const resolvers = {
     Query: {
       hello: (root, args, context) => "Hello world!",
       books: () => books
     }
   };

6. Try to make this GraphQL Query through the Graphiql client in the browser panel:

   {
     books{
       title
       author
     }
   }

Enhancement

Let's enhance the schema to display the authors as a new Author type and as a list of Authors.

1. Update the typeDefs to include the new Author type:

   const typeDefs = gql`
     type Author {
       name: String
     }
   
     type Book {
       title: String
       author: [Author]
     }
   
     type Query {
       books: [Book]
       hello: String
     }
   `;

2. Update the books database.

   const books = [
     {
       title: "The Awakening",
       author: [{ name: "Kate Chopin" }]
     },
     {
       title: "City of Glass",
       author: [{ name: "Paul Auster" }]
     },
     {
       title: "Harry Potter and the Philisopher's Stone",
       author: [{ name: "J.K. Rowling" }]
     }
   ];

3. Reload the Graphiql client in the browser panel and try to make this GraphQL query:

   {
     books{
       title
       author {
         name
       }
     }
   }