MaxInterview - mongoose get id after save

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1n.save(function(err,room){
2  var newRoomId = room._id;
3  });

1//if you are sending an id field in req.body then mongoose will return e null _id
2//to solve this just delete the _id field before running the save method
3if(req.body._id === null) {
4  delete req.body._id;
5}

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