In this chapter, you will learn about mutations. With mutations, you basically create, update, and delete your data. It is like the POST, PUT, and DELETE operations of the RESTful API.
Creating Data
You need to add a mutation in the schema.js file first. Here, we will create a new type of mutation. Inside it we will create our first mutation of addGenre, which will take input and also return the genre. See Listing 3-1.
exports.typeDefs = gql`
type Query {
courses(filter: CoursesFilter): [Course!]!
course(id: ID!): Course ...
