+ def update_trash
+ if saved_change_to_trash_at? or saved_change_to_owner_uuid?
+ # The group was added or removed from the trash.
+ #
+ # Strategy:
+ # Compute project subtree, propagating trash_at to subprojects
+ # Remove groups that don't belong from trash
+ # Add/update groups that do belong in the trash
+
+ temptable = "group_subtree_#{rand(2**64).to_s(10)}"
+ ActiveRecord::Base.connection.exec_query %{
+create temporary table #{temptable} on commit drop
+as select * from project_subtree_with_trash_at($1, LEAST($2, $3)::timestamp)
+},
+ 'Group.update_trash.select',
+ [[nil, self.uuid],
+ [nil, TrashedGroup.find_by_group_uuid(self.owner_uuid).andand.trash_at],
+ [nil, self.trash_at]]
+
+ ActiveRecord::Base.connection.exec_delete %{
+delete from trashed_groups where group_uuid in (select target_uuid from #{temptable} where trash_at is NULL);
+},
+ "Group.update_trash.delete"
+
+ ActiveRecord::Base.connection.exec_query %{
+insert into trashed_groups (group_uuid, trash_at)
+ select target_uuid as group_uuid, trash_at from #{temptable} where trash_at is not NULL
+on conflict (group_uuid) do update set trash_at=EXCLUDED.trash_at;
+},
+ "Group.update_trash.insert"
+ end
+ end
+
+ def before_ownership_change
+ if owner_uuid_changed? and !self.owner_uuid_was.nil?
+ MaterializedPermission.where(user_uuid: owner_uuid_was, target_uuid: uuid).delete_all
+ update_permissions self.owner_uuid_was, self.uuid, REVOKE_PERM
+ end
+ end
+
+ def after_ownership_change
+ if saved_change_to_owner_uuid?
+ update_permissions self.owner_uuid, self.uuid, CAN_MANAGE_PERM
+ end
+ end
+
+ def clear_permissions_and_trash
+ MaterializedPermission.where(target_uuid: uuid).delete_all
+ ActiveRecord::Base.connection.exec_delete %{
+delete from trashed_groups where group_uuid=$1
+}, "Group.clear_permissions_and_trash", [[nil, self.uuid]]
+