Using $$ROOT in aggregation order

Question

I\'m try get data from collection with some order:

db.data.aggregate([
    {$limit: 1000},
    {$group: {
        _id: \"$service\",
        count: {$sum: 1}         


        

Answer 1

So per the comment you need a MongoDB version 2.6 do do this. But of course using 2.6 this works for me:

db.collection.aggregate([
    { "$limit": 1000 }, 
    { "$group": { 
        "_id": null, 
        "count": { "$sum": 1}, 
        "data": { "$push": "$$ROOT"  }
    }}
])