Sort by length of array

[Nico Schlömer]

I have a schema that goes something like
```
var PostSchema = new Schema({

  color: {type: String},

  votes: [{ type: Schema.ObjectId, ref: 'User' }]

})
```
I would now like to sort by "most votes", i.e., sort by the length of an array. The question came up several years ago [1] and at the time, the answer was that

> You can't do that directly. To be able to sort on array length, you have to maintain it in a separate field (votes_count, or whatever).

Is this still up-to-date?

Cheers,

Nico


[1] https://stackoverflow.com/questions/11604075/mongoose-sort-by-array-length?rq=1