创建具有Java文档列表的mongo文档

Question

I would like to create a mongo document in Java to insert into my mongo collection. Currently, the mongo document I am using has no list of documents in it and I want to add one to it.

My document should look something like this:

{
 id : 1,
 events : [
           { event_id : 1, processed : false},
           { event_id : 2, processed : false},
           .
           .
          ],
 assigned_user : 32
}

To create the mongo document, I am forced to create a

Map<String, Object> dataFields

then transform it to a mongo document.

So to add the list of Documents I need, I thought of creating

 List<Document> events

then creating a document for each event I need, then add it to the list of events .

Finally I would simply add the list events to the map dataFields , then create the final mongo document.

Would this work? If not, what is the flaw? Logic or implementation?

Answer 1

If you have an idea, try it. And if your project environment does not allow you to try, sandbox it. I'll give it a go, but my Java is rusty, and I dont have the JDK on this computer. Start with this :

public class MongoSandbox {

    public static void main(String[] args) throws UnknownHostException {

        // Connect to local test db
        MongoClientURI uri  = new MongoClientURI("mongodb://localhost:27017/test"); 
        MongoClient client = new MongoClient(uri);
        MongoDatabase db = client.getDatabase(uri.getDatabase());

        // Get a test collection
        MongoCollection<Document> docs = db.getCollection("docs");

        /* Create a dummy list of events  */
        List<Document> events = new ArrayList<Document>();
        events.add(new Document("random", "data"));
        events.add(new Document("random", "data2"));
        events.add(new Document("random", "data3"));

        // Create your main document
        Document mainDoc = new Document("events", events);
        docs.insert(mainDoc);

        client.close();
    }
}