GraphQL-learning/server.js at main · NazifaPushon/GraphQL-learning · GitHub

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const{
 GraphQLSchema,
 GraphQLObjectType,
 GraphQLString,
 GraphQLList,
 GraphQLInt,
 GraphQLNonNull,
}=require("graphql");

constauthors=[
{id: 1,name: "J. K. Rowling"},
{id: 2,name: "J. R. R. Tolkien"},
{id: 3,name: "Brent Weeks"},
];

constbooks=[
{id: 1,name: "Harry Potter and the Chamber of Secrets",authorId: 1},
{id: 2,name: "Harry Potter and the Prisoner of Azkaban",authorId: 1},
{id: 3,name: "Harry Potter and the Goblet of Fire",authorId: 1},
{id: 4,name: "The Fellowship of the Ring",authorId: 2},
{id: 5,name: "The Two Towers",authorId: 2},
{id: 6,name: "The Return of the King",authorId: 2},
{id: 7,name: "The Way of Shadows",authorId: 3},
{id: 8,name: "Beyond the Shadows",authorId: 3},
];

constexpress=require("express");
require("dotenv").config();
const{ graphqlHTTP }=require("express-graphql");
constapp=express();
constport=process.env.PORT||5000;

constRootMutationType=newGraphQLObjectType({
name: "Mutation",
description: "Root Mutation",
fields:()=>({
addBook:{
type:BookType,
description:'Add a book',
args:{
name:{type: GraphQLNonNull(GraphQLString)},
authorId:{type: GraphQLNonNull(GraphQLInt)}
},
resolve:(parent,args)=>{
constbook={id:books.length+1,name:args.name,authorId:args.authorId}
books.push(book)
returnbook
}
},
addAuthor:{
type:AuthorType,
description:'Add an author',
args:{
name:{type: GraphQLNonNull(GraphQLString)},
},
resolve:(parent,args)=>{
constauthor={id:authors.length+1,name:args.name,}
authors.push(author)
returnauthor
}
},
})
});

constBookType=newGraphQLObjectType({
name: "Book",
description: "This represents a books written by the an autor",
fields: ()=>({
id: {type: GraphQLNonNull(GraphQLInt)},
name: {type: GraphQLNonNull(GraphQLString)},
author: {
type: AuthorType,
resolve: (book)=>{
returnauthors.find((author)=>author.id===book.authorId);
},
},
}),
});

constAuthorType=newGraphQLObjectType({
name: "Author",
description: "This represendts a author",
fields: ()=>({
id: {type: GraphQLNonNull(GraphQLInt)},
name: {type: GraphQLNonNull(GraphQLString)},
books: {
type: newGraphQLList(BookType),
resolve: (author)=>{
returnbooks.filter((book)=>book.authorId===author.id);
},
},
}),
});

constRootQueryType=newGraphQLObjectType({
name: "Query",
description: "Root Query",
fields: ()=>({
book: {
type: BookType,
description: "Single Book",
args: {
id: {
type: GraphQLInt,
},
},
resolve: (parent,args)=>books.find((book)=>book.id==args.id),
},
author: {
type: AuthorType,
description: "single Author",
args: {
id: {
type: GraphQLInt,
},
},
resolve: (parent,args)=>authors.find((author)=>author.id==args.id),
},
books: {
type: newGraphQLList(BookType),
description: "List of great books",
resolve: ()=>books,
},
authors: {
type: newGraphQLList(AuthorType),
description: "List of great Authors",
resolve: ()=>authors,
},
}),
});
constschema=newGraphQLSchema({
query: RootQueryType,
mutation:RootMutationType
});
app.use(
"/graphql",
graphqlHTTP({
schema: schema,
graphiql: true,
})
);

app.listen(port,()=>console.log(`Server is listening on port ${port}`));