MongoDB atomic update via 'merge' document -

i know can atomically update existing mongo document setting specific fields. following code it:

var update = mongodb.driver.builders.update.set("insidelegmeasurement", 32.4); safemoderesult result = personcollection.update(query, update, updateflags.multi,safemode.true); 

however, can atomically update several fields passing in document want 'merge' existing doc? imagine have document follows: {"favcolor":"red","favfood":"pasta"} , want update existing doc these values. want this:

var update = mongodb.driver.builders.update.merge({"favcolor":"red","favfood":"pasta"}); 

or even

var update = mongodb.driver.builders.update.merge(myupdatebsondoc); 

where mybsondocument contains lots of fields don't want have 'unpack' doc merged original.

is possible somehow?

thanks

found answer:

//var snippetjson= '{title:"tin machine ii",brandnewfield:"this gets added nicely"}';     mongodb.bson.bsondocument updatedoc = mongodb.bson.serialization.bsonserializer.deserialize<bsondocument>(snippetjson); var update = new updatedocument { { "$set", updatedoc } }; 

easy when know how!