Is this still required?

[CamiloMM]

If I run the following:

var mySchema = new Schema({data: {}});
mySchema.index({'data.maybe': 1}, {sparse: true});

It runs without errors, so, did Mongoose folks fix the issue that prevented this from working?

(On a related note: is there an issue filled with them about this? It could be liked from the readme here.)

[CamiloMM]

Moreover: if I connect to my db and run

db.mycollection.getIndexes()

I get an index such as:

[
    ...
    {
        "v" : 1,
        "key" : {
                "data.maybe" : 1
        },
        "name" : "data.maybe_1",
        "ns" : "mydb.mycollection",
        "sparse" : true,
        "background" : true,
        "safe" : null
    },
    ...
]

Doesn't that mean it's properly indexed?

[rgarcia]

@CamiloMM what version of mongoose did you run that with? The library here is tested on ~3.6.8.

[CamiloMM]

@rgarcia 3.8.24, sorry for the delay.

[rgarcia]

@CamiloMM thanks. It's very likely that mongoose fixed this in 3.8. You could test this by upgrading package.json here to 3.8, changing the tests to use mongoose and not any_index (here and here), and then running the tests. If the tests pass, then mongoose fixed this in 3.8.