|
In many cases, it would be useful to convert an object to an array. We should add an aggregation expression to do so. For example, it could be called $objectToArray, and do something like this:
> db.foo.insert({_id: 0, subDoc: {a: 1, b: 3, c: "example"}});
|
> db.foo.aggregate([{$project: {expanded: {$objectToArray: "$subDoc"}}}])
|
{_id: 0, expanded: [{k: "a", v: 1}, {k: "b", v: 3}, {k: "c", v: "example"}]}
|
Original Description
Currently, if a collection contains the following document:
{_id: 0, data: {a: 1, b: 2, c: 3}}
|
There is no way to unwind that one document into the following three documents:
{_id: 0, data: {a: 1}}
|
{_id: 0, data: {b: 2}}
|
{_id: 0, data: {c: 3}}
|
|