[CLOSED] Order ESI Funds calls in reverse chronological order of closing date

Issue by issyl0 Tuesday 23 June 2015 at 15:32 GMT Originally opened as https://github.com/alphagov/specialist-publisher/pull/504

Users had to scroll down past recently updated closed funds in order to see the open cases unless they used the filters. Now the results are in reverse chronological order of closing date, so the open ones are at the top.
Add the default_order attribute to the list that is sent to finder-frontend, else the default of "-public_timestamp" would always be used even if we set a different one here (https://github.com/alphagov/finder-frontend/blob/master/app/lib/search_query_builder.rb#L73).
Make sure it's not passed if it's nil, so that GOV.UK Content Schemas don't complain (they always expect a string - https://github.com/alphagov/govuk-content-schemas/blob/master/dist/formats/finder/publisher/schema.json#L123).

This requires an update to Rummager's ALLOWED_SORT_FIELDS, which I'm about to open a PR for.

Paired with @mikejustdoit on this. Thanks also to @evilstreak for his initial help.

issyl0 included the following code: https://github.com/alphagov/specialist-publisher/pull/504/commits

alphagov / specialist-publisher