Mutations

Code

mutation CreateBook($input: CreateBookInput!) {
  createBook(input: $input) {
    id
    title
    author {
      name
    }
  }
}

mutation UpdateBook($id: ID!, $title: String) {
  updateBook(id: $id, title: $title) {
    id
    title
  }
}

Explanation

Mutations perform side effects such as creating or updating records and then return a selection set of the resulting data. The spec executes multiple top-level mutations sequentially, in order, whereas query fields execute in parallel. Returning the changed object lets the client update its cache without an extra fetch.

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