library-reference-data.json

//collection- borrowers

{
  "_id": "some id",
  "name": "Suhas Chatekar",
  "borrowed_books": [
        {
          "bookid": "book 1"
          },
        {
          "bookid": "book 2",
        }
    ]
}


//Collection - books

[
  {
    "_id": "book 1",
    "name": "Build Single Page Applications with SQL",
    "author": {
        "_id": "author 1",
        "_name": "Chuck Norris"
      }
    },
  {
    "_id": "book 2",
    "name": "Some other book",
    "author": {
        "_id": "author 2",
        "_name": "Some other author"
      }
    }
]