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server.js
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server.js
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const express = require('express')
const expressGraphQL = require('express-graphql')
const {
GraphQLSchema,
GraphQLObjectType,
GraphQLString,
GraphQLNonNull,
GraphQLInt,
GraphQLList
} = require('graphql')
const app = express()
let 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 BookType = new GraphQLObjectType({
name: 'Book',
description: 'This represents a book written by an author',
fields: () => ({
id: {
type: new GraphQLNonNull(GraphQLInt),
},
name: {
type: new GraphQLNonNull(GraphQLString)
},
authorId: {
type: new GraphQLNonNull(GraphQLInt)
},
author: {
type: AuthorType,
resolve: (book) => {
return authors.find(author => author.id === book.authorId)
}
}
})
})
const AuthorType = new GraphQLObjectType({
name: 'Author',
description: 'This represents an author of a book',
fields: () => ({
id: {
type: new GraphQLNonNull(GraphQLInt),
},
name: {
type: new GraphQLNonNull(GraphQLString)
},
books: {
type: new GraphQLList(BookType),
resolve: (author) => {
return books.filter(book => book.authorId === author.id)
}
}
})
})
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
},
authors: {
type: new GraphQLList(AuthorType),
description: 'List of all authors',
resolve: () => authors
},
author: {
type: AuthorType,
description: 'An author',
args: {
id: {
type: GraphQLInt
}
},
resolve: (parent, args) => authors.find(author => author.id === args.id)
}
})
})
const RootMutationType = new GraphQLObjectType({
name: 'Mutation',
description: 'Root Mutation',
fields: () => ({
addBook: {
type: BookType,
description: 'Add a book',
args: {
name: { type: new GraphQLNonNull(GraphQLString) },
authorId: { type: new 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: new GraphQLNonNull(GraphQLString) }
},
resolve: (parent, args) => {
const author = { id: authors.length + 1, name: args.name }
authors.push(author)
return author
}
},
removeAuthor: {
type: AuthorType,
description: 'Remove an author',
args: {
id: {
type: new GraphQLNonNull(GraphQLInt)
}
},
resolve: (parent, args) => {
// remove author from the authors array
const author = authors.find(author => author.id === args.id)
authors = authors.filter(author => author.id !== args.id)
return author
}
}
})
})
const schema = new GraphQLSchema({
query: RootQueryType,
mutation: RootMutationType
})
app.use('/graphql', expressGraphQL.graphqlHTTP({
schema,
graphiql: true
}))
app.listen(5000, () => console.log('server is running'))