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We’re overhauling Dgraph’s docs to make them clearer and more approachable. If you notice any issues during this transition or have suggestions, please let us know.
Add mutations allow you to add new objects of a particular type. We use the following schema to demonstrate some examples. Schema: 
type Author {
  id: ID!
  name: String! @search(by: [hash])
  dob: DateTime
  posts: [Post]
}

type Post {
  postID: ID!
  title: String! @search(by: [term, fulltext])
  text: String @search(by: [fulltext, term])
  datePublished: DateTime
}
Dgraph automatically generates input and return types in the schema for the add mutation, as shown below: 
addPost(input: [AddPostInput!]!): AddPostPayload

input AddPostInput {
  title: String!
  text: String
  datePublished: DateTime
}

type AddPostPayload {
  post(filter: PostFilter, order: PostOrder, first: Int, offset: Int): [Post]
  numUids: Int
}
Example: add mutation on single type with embedded value 
mutation {
  addAuthor(input: [{ name: "A.N. Author", posts: [] }]) {
    author {
      id
      name
    }
  }
}
Example: add mutation on single type using variables 
mutation addAuthor($author: [AddAuthorInput!]!) {
  addAuthor(input: $author) {
    author {
      id
      name
    }
  }
}
Variables: 
{ "author": { "name": "A.N. Author", "dob": "2000-01-01", "posts": [] } }
You can convert an add mutation to an upsert mutation by setting the value of the input variable upsert to true. For more information, see Upsert Mutations.

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Examples

You can refer to the following link for more examples.
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