Question

I have a simple structured document like this:

"people" : [
    {
        "id" : "6241863",
        "amount" : 5
    }
],

People can contain more than one element. I’ve managed to get this to work:

db.village.findOne({"people": {"$in": [{"id": "6241863", "amount": 5}]}})

But I want to ignore amount and search for any document containing people with id 6241863 and any amount.

Answer 1

According to the advanced query documentation, you can mix array value queries with dot notation for reaching into objects. Here’s an example using your schema:

$ mongo
MongoDB shell version: 2.1.0
connecting to: test
> db.users.save({_id: 1, friends: [{id: 2, name: 'bob'}]})
> db.users.find({friends: {id: 2, name: 'bob'}})
{ "_id" : 1, "friends" : [ { "id" : 2, "name" : "bob" } ] }

> db.users.find({'friends.id': 2})
{ "_id" : 1, "friends" : [ { "id" : 2, "name" : "bob" } ] }

> db.users.find({'friends.name': 'bob'})
{ "_id" : 1, "friends" : [ { "id" : 2, "name" : "bob" } ] }

> db.users.find({'friends.name': 'ted'})
>