Sorting by multiple fields

[nojacko]

Currently sorting is only available on one attribute. I was looking to add sorting by multiple attributes.

I was planning on doing it using CSV, similar to includes and filters.

i.e. sort=-attr_one,+attr_two,-attr_three

Is this something you'll be cool with if I get it working and make a PR?

[paparomeo]

Yes, that would definitely be a welcome contribution. Have a look at what the spec says about sorting. It's pretty much your proposed format but the + is implicit instead of explicit.