MongoDB: match non-empty doc in array

Question

I have a collection structured thusly:

{
  _id: 1,
  score: [
    {
      foo: \'a\',
      bar: 0,
      user: {user1: 0, user2: 7}
    }
  ]
}

<

Answer 1

Figured it out: { 'score.user': { "$gt": {} } } will match non-empty docs.