如何更新具有复杂结构的Mongo DB文档

Question

I have a mongoDB document with the following structure

{
  "id": 9595511812,
  "Feeds": [
    {
      "department": "mseb",
      "consumer_number": 1234567890,
      "due_date": "2016-11-11",
      "due_amount": 400,
      "balance_amount": 0,
      "unitsConsumed": 40,
      "freezeDate": "2016-11-11",
      "lastPaidDate": "2016-11-11",
      "billNumber": "9877",
      "id": "1",
      "paid": false
    },
    {
      "department": "mseb",
      "consumer_number": 1234567890,
      "due_date": "2016-11-21",
      "due_amount": 400,
      "balance_amount": 0,
      "unitsConsumed": 40,
      "freezeDate": "2016-11-21",
      "lastPaidDate": "2016-11-21",
      "billNumber": "9877",
      **"id": "2",**
      "paid": false
    }
  ]
}

I want to update paid == true for Feed with id=2 (** marked field above). How can I do that in using mongo java client?

I have tried

 DB db = DBConnection.getDatabaseConnection();
        DBCollection table = db.getCollection("customer");
        BasicDBObject newDocument = new BasicDBObject();
        newDocument.append("$set", new BasicDBObject().append("Feeds.paid", "true"));

        BasicDBObject searchQuery = new BasicDBObject().append("id", "9595511812");

        table.update(searchQuery, newDocument);

Answer 1

Feeds is an array, and you're updating the 2nd element, so the set would end with:

.append("Feeds.1.paid", "true"));

instead of:

.append("Feeds.paid", "true"));