go - mongodb query using mgov2 -


i have collection of endpoint point tests conducted on various channels. sample document collection is:

{     "_id" : objectid("59959b30c699811077751b12"),     "teststatus" : "fail",     "channelname" : "housecontroller",     "timestamp" : isodate("2017-08-17t13:15:53.170z"),     "testid" : "llpkigifiiquqksapwnn" }

i quering project result this:

[   {     "fail": 20,     "success count": 30,     "total": 50,     "channel": "c3"   }, ...

but getting wrong count success , fail rate. current query in golang looks like:

o1:=  bson.m{     "$project" :bson.m{         "channel": "$channelname",         "time":"$timestamp",         "teststatus" : "$teststatus",         "_id":1,     }, } o2:=  bson.m{     "$group" :bson.m{         "_id": "$channel",         "success": bson.m{             "$sum":bson.m{ "$eq" :"teststatus","pass"},         },         "total": bson.m{             "$sum": 1,         },     }, } o3:=  bson.m{     "$project" :bson.m{         "channel": "$_id",         "success count":"$success",         "total" : "$total",         "_id":0,         "fail": bson.m{             "$subtract": []interface{}{"$total", "$success"},         },     }, }

i doing wrong in counting of success count. cant figure right. have started mgo , golang. in advance

you need use $cond conditional counting. example following counts tests, failed ones , successful ones in 1 step:

o2 := bson.m{     "$group" :bson.m{         "_id": "$channel",         "total": bson.m{             "$sum": 1,         },         "success": bson.m{"$sum": bson.m{             "$cond": []interface{}{                 bson.m{ "$eq": []interface{}{"$teststatus", "pass"}},                 1, 0,             },         }},         "fail": bson.m{"$sum": bson.m{             "$cond": []interface{}{                 bson.m{"$eq": []interface{}{"$teststatus", "fail"}},                 1, 0,             },         }},     }, }

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