Mongodb query to group by multiple fields and filter - mongodb

Question

I want to be able to group each "Place" to show over time, how many "PatientIds" they are seeing on a given day and then be able to filter this by what the action is.
Basically Total Patients on y-axis, Date on x-axis and then a filter or stacked chart to show the action. I also thought about a mapreduce, but have never done that in mongo
I can't figure out the correct mongo query. Right now I have:
db.collection.aggregate({"$group":{_id:{place:"$place",date:"$date",action:"$action",count:{$sum:1}}},{$sort:{"_id.date":1,"_id.place":1}})
However, this is just listing out the data. I tried to do a match on all places, but that didn't give me the results I was looking for either. Any ideas?
Example json:
{
"_id" : ObjectId(""),
"patientId" : "100",
"place" : "1",
"action" : "DIAGNOSED",
"date" : ISODate("2017-01-20")
}
{
"_id" : ObjectId(""),
"patientId" : "101",
"place" : "1",
"action" : "PATIENT IN",
"date" : ISODate("2017-01-20)
}
{
"_id" : ObjectId(""),
"patientId" : "200",
"place" : "2",
"action" : "MEDICINE",
"date" : ISODate("2017-01-05")
}
{
"_id" : ObjectId(""),
"patientId" : "300",
"place" : "2",
"action" : "DIAGNOSED",
"date" : ISODate("2017-01-31")
}
EDIT - mapreduce
> var map = function(){emit(this.place,1)}
> var reduce = function(key,values){var res = 0;values.forEach(function(v){res+=1});return{count:res};}
> db.new.mapReduce(map,reduce,{out:"mapped_places"});
{
"result" : "mapped_places",
"timeMillis" : 88,
"counts" : {
"input" : 4,
"emit" : 4,
"reduce" : 2,
"output" : 2
},
"ok" : 1
}
> db.mapped_offices.find({})
{ "_id" : "1", "value" : { "count" : 2 } }
{ "_id" : "2", "value" : { "count" : 2 } }
>

Answer 1

You can try below aggregation query.
db.collection.aggregate([
{
"$group": {
"_id": {
"date": "$date",
"place": "$place"
},
"actions": {
"$push": "$action"
},
"count": {
"$sum": 1
}
}
},
{
"$unwind": "$actions"
},
{
"$sort": {
"_id.date": 1,
"_id.place": 1
}
}
]);
This should output something like
{ "_id" : { "date" : ISODate("2017-01-20T00:00:00Z"), "place" : "1"}, "count" : 2, "actions" : "PATIENT IN" }
{ "_id" : { "date" : ISODate("2017-01-20T00:00:00Z"), "place" : "1"}, "count" : 2, "actions" : "DIAGNOSED" }