type Post {
  id: ID!
  title: String!
  author: String!
  contents: String!
  comments: [Comment!]!
  allowComments: Boolean!
}

type Comment {
  id: ID!
  post: Post!
  author: String!
  contents: String!
  replyTo: Comment
  replies: [Comment!]!
}

type Query {
  allPosts: [Post!]!
}

type Mutation {
  addPost(input: PostInput): AddResult!
  addComment(input: CommentInput): AddResult!
}

input PostInput {
  title: String!
  author: String!
  contents: String!
  allowComments: Boolean! = true
}

input CommentInput {
  parentPostId: ID
  parentCommentId: ID
  author: String!
  contents: String!
}

type AddResult {
  itemId: ID!
}