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}
    }
  ]
}

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Answer 1

I'm not sure I quite understand your schema, but perhaps the most straight forward way would be to not have an "empty" value for score.user ?

Instead purposely not have that field in your document if it has no content?

Then your query could be something like ...

> db.test.find({ "score" : { "$elemMatch" : { bar : 0, "user" : {"$exists": true }}}})

i.e. looking for a value in score.bar that you want (0 in this case) checking for the mear existence ($exists, see docs) of score.user (and if it has a value, then it'll exist?)

editied: oops I missed the $elemMatch you had ...