如何在Angular2-Meteor中使用$ lookup

Question

I get this error when using $lookup operator in angular2-meteor:

Exception from sub tasks id bAJHF7MZzEidGBZ63

 Error: Exception while polling query 

{
    "collectionName": "tasks",
    "selector": {
        "$lookup": {
            "from": "projects",
            "localField": "project._id",
            "foreignField": "_id",
            "as": "proj"
        }
    },
    "
    " options ": {
        "transform ": null
    }
}:

unknown top level operator: $lookup

When I query directly using robomongo I get the result.

versions:
Mongo 3.2.6
angular2-meteor: 0.7.0
Meteor 1.4.2.3 

I use:

Tasks.find()

It seams I need Tasks.aggregate() that is not implemented

Answer 1

We came to conclusion that $lookup in angular2-meteor would corrupt the data. We used different approach. We store all needed data in all collections.