send object as value in map and reduce in mgo?

[Adusumilli SeshaChandra]

can we send  complete "this" object as value in emit function of map or it should be some property of "this" object in MapandReduce of mgo?? 

[Gustavo Niemeyer]

The map/reduce functionality is implemented by the server, so the same
rules apply to all drivers. I suggest having a look at the server
documentation, which has details and examples on it:

http://docs.mongodb.org/manual/core/map-reduce/
http://docs.mongodb.org/manual/tutorial/map-reduce-examples/

I would also strongly recommend using the aggregation framework
instead of the map/reduce functionality, if you can:

http://gopkg.in/mgo.v2#Collection.Pipe
http://docs.mongodb.org/manual/core/aggregation-pipeline/

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gustavo @ http://niemeyer.net