mongoose - MongoDB groupby query -


i have colletions containing records 

{ "type" : "me", "tid" : "1"  } { "type" : "me", "tid" : "1" } { "type" : "me", "tid" : "1" } { "type" : "you", "tid" : "1" } { "type" : "you", "tid" : "1" }  { "type" : "me", "tid" : "2" } { "type" : "me", "tid" : "2"} { "type" : "you", "tid" : "2"} { "type" : "you", "tid" : "2" } { "type" : "you", "tid" : "2"}

i have want result below

[  {"tid" : "1","me" : 3,"you": 2},  {"tid" : "2","me" : 2,"you": 3} ]

i have tried group and; aggregate queries doesn't required result format.

below group query.

db.coll.group({   key: {tid : 1,type:1},   cond: { tid  : { "$in" : [ "1","2"]}  },    reduce: function (curr,result) {      result.total = result.total + 1   },   initial: { total : 0} })

it result 

[   {"tid" : "1",  "type" : "me" ,"total": 3 },   {"tid" : "1","type" : "you" ,"total": 2 },   {"tid" : "2", "type" : "me" ,"total": 2 },   {"tid" : "2","type" : "you" ,"total": 3 } ]

following aggregate query

db.coll.aggregate([   {$match : { "tid" : {"$in" : ["1","2"]}}},   {$group : { _id : {tid : "$tid",type : "$type"},total : {"$sum" : 1}}} ])

gives following result 

{    "result" :    [     {"_id" : {"tid" : "1","type" : "me"},"total" : 3},     {"_id" : {"tid" : "2","type" : "me" },"total" : 2},     {"_id" : {"tid" : "2","type" : "you"},"total" : 3}   ]   "ok" : 1 }

it possible obtain specified result or have manipulation in code.

thanks

if change aggregation this:

db.so.aggregate([     { $match : { "tid" : { "$in" : ["1", "2"] } } },      { $group : {          _id : { tid : "$tid", type : "$type" },          total : { "$sum" : 1 }      } },      { $group : {          _id : "$_id.tid",         values: { $push: { type: "$_id.type", total: '$total' } }     } } ])

then output is:

{     "result" : [         {             "_id" : "1",             "values" : [                 { "type" : "you", "total" : 2 },                 { "type" : "me", "total" : 3 }             ]         },         {             "_id" : "2",             "values" : [                 { "type" : "me", "total" : 2 },                 { "type" : "you", "total" : 3 }             ]         }     ],     "ok" : 1 }

although not same want, going closest can get. , in application, can pull out values in same like out of it.

just keep in mind, in general can not promote value (you, me) key — unless key of limited set (3-4 items max).


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