gistfile1.txt

      data: {
        type: 'authors',
        attributes: { first_name: 'Stephen', last_name: 'King' },
        relationships: {
          books: {
            :"added-data" => [
              {
                :"temp-id" => "abc123",
                type: 'books',
                attributes: { title: 'The Shining' },
                relationships: {
                  tags: {
                    :"added-data" => [
                      :"temp-id" => "def456",
                      type: 'tags',
                      attributes: { name: 'Scary' }
                    ]
                  }
                }
              }
            ]
          }
        }
      }
    }