MongoDb aggregate domunets fields and merge -


i have document saved structure

{    some_key: {          param1 : "val1",         param2 : "val2",         param3 : "val3"         param4 : "val4"         param5 : "val5"    } }

"some_key" field can contains or fields

i have 1 of document every user on every day

user 1, day1  {    some_key: {          param1 : "val1",         param2 : "val2",         param5 : "val5"    } };   user2 day 1 {    some_key: {         param5 : "val5"    } };   user1 day2 {    some_key: {          param1 : "val1",         param3 : "val3",         param5 : "val5"    } };   user2 day 1 {    some_key: {          param1 : "val1",         param4 : "val4",         param5 : "val5"    } };

i need obtain merged documents , obtain every param medium or sum of values

like this

{    some_key: {          param1 : "medium or som params1",         param2 : "medium or som params2",         param3 : "medium or som params3",         param4 : "medium or som params4",         param5 : "medium or som params5",    } };


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