alphagov/whitehall — pull request #836 by bradleywright (2013-09-10 14:51:26+00:00)
Title: Sort document series group editions

This matches DocumentSeries#published_editions and causes the order to be set correctly.

There's a separate `order` column for DocumentSeriesGroup items, but it's simpler and fulfils the ticket to just use `public_timestamp`.

https://www.pivotaltracker.com/story/show/56704236