Question

I am running a code like:

db.items.group({
    cond: {"id": {$in: [1,2,3]}},
    initial: {},
    reduce: function(item_data, out) { print(item_data.id + "," + item_data.price); }
});

I would like to have a CSV-formatted output of id,price pairs (for particular items). However, nothing is printed (except of an empty result of mapReduce). What is the right way to accomplish the mission?

Answer 1

db.items.find({
    "id": {$in: [1,2,3]}
}).forEach(function(item_data) { print(item_data.id + "," + item_data.price); })