MongoDB $match won't work with $group in an aggregate query - mongodb

Question

This is what my collection looks like.
{ "name" : "Lorem", "createdate" : ISODate("2018-09-12T04:02:41.208Z")},
{ "name" : "Impusom", "createdate" : ISODate("2018-09-12T04:02:41.208Z")}
{ "name" : "Lorem", "createdate" : ISODate("2018-11-01T04:02:41.208Z")}
{ "name" : "Damut", "createdate" : ISODate("2018-11-12T04:02:41.208Z")}
{ "name" : "Remetat", "createdate" : ISODate("2019-01-01T04:02:41.208Z")}
I want to extract distinct createdate values so I can mark them on a calendar widget. I wish to ignore time.
Here is the pipeline which is I am currently using.
db.mycollection.aggregate({
'$project': {
'y': {
'$year': '$createdate'
},
'm': {
'$month': '$createdate'
},
'd': {
'$dayOfMonth': '$createdate'
}
}
}, {
'$group': {
'_id': {
'year': '$y',
'month': '$m',
'day': '$d'
}
}
}, {
'$sort': {
'_id.year': 1,
'_id.month': 1,
'_id.day': 1
},
})
The result looks like this
{
"_id" : {
"year" : 2019,
"month" : 1,
"day" : 1
}
},
{
"_id" : {
"year" : 2018,
"month" : 11,
"day" : 12
}
},
{
"_id" : {
"year" : 2018,
"month" : 11,
"day" : 1
}
},
{
"_id" : {
"year" : 2018,
"month" : 9,
"day" : 12
}
}
I wish to improve the query and limit data to a particular year. e.g. 2018
Hence I tried adding a match condition before $project
{ '$match': { "createdate":{ "$gte": ISODate("2017-12-31T18:30:00.000Z"), "$lt": ISODate("2018-12-31T18:30:00.000Z") } }
},
The result is limited to year 2018 but then $group stops working hence I get duplicated records for dates.
I tried moving the $match option after $sort which allows $group to work but won't apply $match condition.
I would really appreciate a nudge in the right direction.
Update ---
So the above query with $match condition is working in mongoplayground.net
But not with my mongoose code.
const pipeline = [{
"$match": {
"createdate": {
"$gte": moment().startOf('year'),
"$lt": moment().endOf('year'),
}
}
},{
'$project': {
'y': {
'$year': '$createdate'
},
'm': {
'$month': '$createdate'
},
'd': {
'$dayOfMonth': '$createdate'
}
}
}, {
'$group': {
'_id': {
'year': '$y',
'month': '$m',
'day': '$d'
}
}
}, {
'$sort': {
'_id.year': 1,
'_id.month': 1,
'_id.day': 1
},
}];
Collection.aggregate(pipeline, (err, dates) => { res.json({ data: dates }); });
The response returns empty array.

Answer 1

Change your $match section to:
"$match": {
"createdate": {
"$gte": moment().startOf('year').toDate(),
"$lt": moment().endOf('year').toDate(),
}
}
And see if this helps. I do not think moment would work as a valid date parameter