book_id = DB.create_book(book.title)
    DB.set_author(book_id, book.author)

    book_id = DB.create_book(book.title, book.author)

  def create_book(title) do

  def create_book(title, author) do

        MERGE (book:Book {title: $title})

        MERGE (book:Book {title: $title, author: $author})

        %{title: title}

        %{title: title, author: author}

  end
  def set_author(book_id, author) do
    Bolt.Sips.query!(
      Bolt.Sips.conn(),
      """
      MATCH (book)
      WHERE id(book) = $id
      SET book.author = $author
      """,
      %{id: book_id, author: author}
    )