Fixes#2492
* Added api/groups/{id} endpoint for retrieving a single group by its id
* Fixed GroupRepository incorrectly opening query to User instead of Group model
* Added filtering & paging abilities to GET api/groups endpoint
* Added test for sorting for GET api/groups endpoint
Co-authored-by: Alexander Skvortsov <38059171+askvortsov1@users.noreply.github.com>
Only users that have the new `viewHiddenGroups` permissions will be able to see these groups.
You might want this when you want to give certain users special permissions, but don't want to make your authorization scheme public to regular users.
Co-authored-by: luceos <daniel+github@klabbers.email>
