How can i work with GraphQL Mutation? - facebook-graph-api

Question

how can i work with resolvers for mutations after i create type Mutations in graphql-yoga?
i've tried to create resolvers for mutations, but when i run in graph playground, i the code return error.
and here's my code:
const { GraphQLServer } = require('graphql-yoga')
// 1
const typeDefs = `
type Query {
users: [User!]!
user(id: ID!): User
}
type Mutation {
createUser(name: String!): User!
}
type User {
id: ID!
name: String!
}
`
// 2
const resolvers = {
Query: {
users: () => User,
},
Mutation: {
// WHAT SHOULD I WRITE IN HERE?
}
}
// 3
const server = new GraphQLServer({
typeDefs,
resolvers,
})
server.start(() => console.log(`Server is running on http://localhost:4000`))
if someone know how can i do for resolvers mutation, can shared with me?
thanks

Answer 1

Resolver for createUser can be defined as follows:
const resolvers = {
Query: {
// Query resolvers
},
Mutation: {
createUser: (parent, args) => {
// Business logic. Maybe save record in database
// Return created user. I am returning dummy data for now, so that you can test it in playground
return {id: 1, name: "John}
}
}
}

Answer 2

Finally it works for me.
i used this:
const resolvers = {
Query: {
users: () => User
},
Mutation: {
createUser: (source, {input}) => {
let newUser = [];
newUser.id = id;
newUser.name = input.name;
User.push(newUser);
return newUser;
}
}
}