Sort specifiers

Sort Specifiers

Sorts may be specified using your choice of several syntaxes:

// All of these do the same thing (sort in ascending order by
// key "a", breaking ties in descending order of key "b")

[["a", "asc"], ["b", "desc"]]
["a", ["b", "desc"]]
{a: 1, b: -1}

The last form will only work if your JavaScript implementation preserves the order of keys in objects. Most do, most of the time, but it's up to you to be sure.

For local collections you can pass a comparator function which receives two document objects, and returns -1 if the first document comes first in order, 1 if the second document comes first, or 0 if neither document comes before the other. This is a Minimongo extension to MongoDB.