mongodb - Using $$ROOT in aggregation order -


i'm try data collection order:

db.data.aggregate([     {$limit: 1000},     {$group: {         _id: "$service",         count: {$sum: 1},         data: {$push: '$$root'}     }} ]);

but next error:

error("printing stack trace")@:0 ()@src/mongo/shell/utils.js:37 ([object array])@src/mongo/shell/collection.js:866 @(shell):6  uncaught exception: aggregate failed: {     "errmsg" : "exception: fieldpath field names may not start '$'.",     "code" : 16410,     "ok" : 0 }

where did go wrong?

so per comment need mongodb version 2.6 do this. of course using 2.6 works me:

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

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