MongoDB Aggregate multiple count and latest date -


i'm trying mongo 3.0 query beyond depth. hoping bit of help. basically, database has transcription records whereby there given user name, project id, expedition id, , finished_date. fields i'm interested in. project have multiple expeditions, each expedition multiple transcriptions.

i display information given user in stats page given project. display user name, total project transcriptions user submitted whole project, total participated expeditions number of expeditions user participated in across project, , last date user performed transcription.

so far, it's easy enough total project transcriptions using count on user_name , matching project_id

db.transcriptions.aggregate([ { "$match" : {"projectid" => 13}}, { "$group": {         "_id": "$user_name",         "transcriptioncount" : {"$sum" : 1 }      } } ])

each transcription document has expeditionid field (4, 7, 9, 10, etc.) , finished_date. if user performed 100 transcriptions, participating in expedition 7 , 10, total participated expeditions = 2 last finished_date being date showing last time user performed transcription. example of returned record:

user_name: john smith transcriptioncount: 100 expeditioncount: 2 last_date: 2017-08-15

hope explained enough. appreciate help.

you can try below aggregation.

db.transcriptions.aggregate([   {     "$match": {       "projectid" => 13     }   },   {     "$sort": {       "finished_date": -1     }   },   {     "$group": {       "_id": "$user_name",       "transcriptioncount": {         "$sum": 1       },       "expedition": {         "$addtoset": "$expedition_id"       },       "last_date": {         "$first": "$finished_date"       }     }   },   {     "$project": {       "_id": 0,       "user_name": "$_id",       "transcriptioncount": 1,       "expeditioncount": {         "$size": "$expedition"       },       "last_date": 1     }   } ])

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