MongoDB: multiple $elemMatch

Question

I have MongoDB documents structured like this:

{_id: ObjectId(\"53d760721423030c7e14266f\"),
fruit: \'apple\',
vitamins: [
    {
     _id: 1,
     name: \'B7         


        

Answer 1

var fruits = db.fruits.find({
    "vitamins": {
        $all: [{
            $elemMatch: {
                "name": "A1",
                "state": "non_free"
            }
        }, {
            $elemMatch: {
                "name": "B7",
                "state": "free"
            }
        }]
    }
})