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Aggregate $match with ISODate

See original GitHub issue

Hey guys -

Have been scratching my head today on this one.

TL;DR

When using a .aggregate([{ $match: }]) , I’m unable to get results back when matching dates. I am able to get results back from the command line via aggregation matching, as well as Robomongo, and from Model.find() when using a date.

Tests - Newbie Disclaimer

I went ahead and forked so that I could add in some tests, although it appears that aggregate.test.js does not run any of its tests. At least I’m getting a 0 tests complete when doing T="-g 'aggregate.test.js' -R spec" make test - console.logs() work inside the describe() levels, but not instead the it() levels. I’m new to tests a bit so I’ll keep working on that.

Some details

Looking to $match a set of data to a date range, so that I can pipeline it to a $group.

This works and returns data from Robomongo (as well as the mongo shell):

db.points.aggregate([
{
  '$match' : { 'createdAt' : { '$gte' : ISODate('2013-07-26T18:23:37.000Z') } }
},
{
  '$group' : { '_id' : '$rfid' }
}
]);

This works and returns data from Model.find()

Points.find({
    createdAt: {
        $gt: '2013-07-26T18:23:37.000Z',
    }
}, callback);

Additionally, this aggregate pipeline worked before, where vendorId was a string for the $match values

Points.aggregate([
    { $match : { vendorId : vendorId } },
    { $group : { _id : '$rfid', amount: { $max : '$amount' } } },
    { $project: { _id: 0, amount: 1, rfid: '$_id' } },
    { $sort : { points: -1 } },
    { $limit : 25 }
], callback);

The ‘bug’

I am not able to retrieve any results from Points.aggregate([]) when using a $match that contains any variation of this:

$match : { createdAt : { $gt: utcBounds.start, $lt: utcBounds.end } }  // moment utc dates that work in .find() as well
$match : { createdAt : Date('2013-07-26T18:23:37.000Z') }
$match : { createdAt : Date('2013-07-26T18:23:37.000Z').toISOString() }
$match : { createdAt : Schema.Types.Date('2013-07-26T18:23:37.000Z') }
$match : { createdAt : '2013-07-26T18:23:37.000Z' }
$match : { createdAt : { $gt: '2013-07-26T18:23:37.000Z' } }

Sample Data

If it helps, pulling up a record from MongoLabs looks like this:

{
    "rfid": "0004980F0A9E2A80",
    "type": "debit",
    "vendorId": "51e837ce2d494abc32000001",
    "fullName": "Stephen Rivas Jr.",
    "_id": {
        "$oid": "51f2bea9560b54b437000001"
    },
    "createdAt": {
        "$date": "2013-07-26T18:23:37.000Z"
    },
    "amount": 15,
    "__v": 0
}

If I’m missing something, I apologize. After several different attempts, and upon realizing I am able to query the collection through other methods with the same type of query - I figured this was a bug and not necessarily a user error. Mayhaps have missed something in the documentation too.

Like I said above, I went ahead and forked the repo so I can start trying to build some tests for it - if someone wants to point me in the right direction there for running those I’m happy to try and find the root of the issue as well.