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index.js
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index.js
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/*
* @Name: First NodeJs GraphQL
* @Author: Max Base
* @Repository: https://github.com/BaseMax/first-nodejs-graphql
* @Date: 2020-12-24
*/
const express = require('express')
const { graphqlHTTP } = require('express-graphql')
const {
GraphQLSchema,
GraphQLObjectType,
GraphQLString,
GraphQLList,
GraphQLInt,
GraphQLNonNull
} = require('graphql')
const app = express()
const PORT = 5000
const authors = [
{id: 1, name: 'J. K. Rowling'},
{id: 2, name: 'J. R. R. Tolkien'},
{id: 3, name: 'Brent Weeks'},
]
const books = [
{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},
]
const AuthorType = new GraphQLObjectType({
name: 'Author',
description: 'This represents a author of a book',
fields: () => ({
id: {type: GraphQLNonNull(GraphQLInt)},
name: {type: GraphQLNonNull(GraphQLString)},
books: {
type: new GraphQLList(BookType),
resolve: (author) => {
return books.filter(book => book.authorId === author.id)
}
}
})
})
const BookType = new GraphQLObjectType({
name: 'Book',
description: 'This represents a book written by an author',
fields: () => ({
id: {type: GraphQLNonNull(GraphQLInt)},
name: {type: GraphQLNonNull(GraphQLString)},
authorId: {type: GraphQLNonNull(GraphQLInt)},
author: {
type: AuthorType,
resolve: (book) => {
return authors.find(author => author.id === book.authorId)
}
}
})
})
const RootQueryType = new GraphQLObjectType({
name: 'Query',
description: 'Root Query',
fields: () => ({
book: {
type: BookType,
description: 'A Single Book',
args: {
id: { type: GraphQLInt }
},
resolve: (parent, args) => books.find(book => book.id === args.id)
},
books: {
type: new GraphQLList(BookType),
description: 'List of All Books',
resolve: () => books
},
author: {
type: AuthorType,
description: 'A Single Author',
args: {
id: {type: GraphQLInt }
},
resolve: () => authors.find(author => author.id === args.id)
},
authors: {
type: new GraphQLList(AuthorType),
description: 'List of All Authors',
resolve: () => authors
}
})
})
const RootMutationType = new GraphQLObjectType({
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) => {
const book = { id: books.length + 1, name: args.name, authorId: args.authorId}
books.push(book)
return book
}
},
addAuthor: {
type: AuthorType,
description: 'Add an author',
args: {
name: { type: GraphQLNonNull(GraphQLString) },
},
resolve: (parent, args) => {
const author = { id: authors.length + 1, name: args.name}
authors.push(author)
return author
}
}
})
})
const schema = new GraphQLSchema({
query: RootQueryType,
mutation: RootMutationType,
})
// const schema = new GraphQLSchema({
// query: new GraphQLObjectType({
// name: 'HelloWorld',
// fields: () => ({
// message: {
// type: GraphQLString,
// resolve: (parent, args) => 'Hello World'
// }
// })
// })
// })
// app.use(bodyParser.json())
// app.use('/graphql', graphqlHTTP({
// schema: schema,
// graphiql: true
// }))
app.get('/graphql', graphqlHTTP({
schema: schema,
graphiql: true
}))
app.post('/graphql', graphqlHTTP({
schema: schema,
graphiql: false
}))
app.listen(PORT, () => {
console.log('Server Running...')
})