Question

I’m trying to retrieve only a subset of fields from mongodb using Java driver. In documentation I found a way to do this javascript-way

db.posts.find( { tags : 'tennis' }, { comments : 0 } );

Trouble is, if I do similar thing in java

db.getCollection("posts").find(new BasicDBObject("comments",0));

What it does, is filtering objects where "comments" == 0, and does pull comments field as usual.

How to do this properly in java?

Answer 1

I think you have to use it the following way:

BasicDBObject keys = new BasicDBObject();
keys.put("comments", 0);
db.getCollection("posts").find(new BasicDBObject(), keys);