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index.js
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index.js
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const express = require('express')
const { graphqlHTTP } = require('express-graphql');
var data = require('./data')
const {
GraphQLSchema,
GraphQLObjectType,
GraphQLString,
GraphQLList,
GraphQLInt,
GraphQLNonNull,
GraphQLFloat
} = require('graphql')
const app = express()
const authors = data.authors();
const books = data.books();
const students = data.students();
const colleges = data.colleges();
// Object Types
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 a 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 StudentType = new GraphQLObjectType({
name: 'Student',
description: 'This represents a Students in the university.',
fields: () => ({
id: { type:new GraphQLNonNull(GraphQLString) },
name: { type: GraphQLString },
email: { type:new GraphQLNonNull(GraphQLString) },
collegeId: { type:new GraphQLNonNull(GraphQLString) },
college: {
type: CollegeType,
resolve: (student) => {
return colleges.find(college => college.id === student.collegeId)
}
}
})
})
const CollegeType = new GraphQLObjectType({
name: 'College',
description: 'This represents a College in the university.',
fields: () => ({
id: { type:new GraphQLNonNull(GraphQLString) },
name: { type:GraphQLString },
rating: { type:new GraphQLNonNull(GraphQLFloat) },
term: { type:new GraphQLNonNull(GraphQLInt) },
students: {
type: new GraphQLList(StudentType),
resolve: (college) => {
return students.filter(student => student.collegeId === college.id)
}
}
})
})
///// QUERY
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: 'A Single Author',
args: {
id: { type: GraphQLInt }
},
resolve: (parent, args) => authors.find(author => author.id === args.id)
},
students: {
type: new GraphQLList(StudentType),
description: 'List of All Students',
resolve: () => students
},
student: {
type: StudentType,
description: 'A Single Student',
args: {
id: { type: GraphQLString },
},
resolve: (parent, args) => students.find(student => student.id === args.id)
},
colleges: {
type: new GraphQLList(CollegeType),
description: 'List of All Colleges',
resolve: () => colleges
},
college: {
type: CollegeType,
description: 'A Single College',
args: {
id:{type:GraphQLString}
},
resolve: (parent, args) =>colleges.find(college => college.id === args.id)
}
})
})
//TODO: Make a new Mutation
///// MUTATION
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
}
}
,
addStudent: {
type: StudentType,
description: 'Add a new student',
args: {
name: { type: new GraphQLNonNull(GraphQLString) },
email: { type: new GraphQLNonNull(GraphQLString) },
collegeId: { type: new GraphQLNonNull(GraphQLString) },
},
resolve: (parent, args) => {
let id = students[students.length - 1].id; //"ETS101/11"
let idString = id.split("ETS")[1];
let ids = idString.split("/")[0];
let lastId = parseInt(ids) + 1;
const ID = `ETS${lastId}/11`;
const student = { id: ID, name: args.name, email: args.email, collegeId: args.collegeId };
students.push(student);
return student;
}
},
addCollege: {
type: CollegeType,
description: 'Add a new College ',
args: {
id: { type: new GraphQLNonNull(GraphQLString) },
name: { type: new GraphQLNonNull(GraphQLString) },
rating: { type: new GraphQLNonNull(GraphQLFloat) },
term: { type: new GraphQLNonNull(GraphQLInt) }
},
resolve: (parent, args) =>{
const college = { id: args.id, name: args.name, rating: args.rating, term: args.term };
colleges.push(college);
return college;
}
}
})
})
const schema = new GraphQLSchema({
query: RootQueryType,
mutation: RootMutationType
})
app.use('/graphql', graphqlHTTP({
schema: schema,
graphiql: true
}))
app.listen(3000, () =>
console.log('✌️ Server Running at http://localhost:3000/graphql')
);