ArgumentError: invalid range "r-0" in string transliteration

[askehansen]

I ran into this rare issue where I have a model PlaylistTrack and when I call find(id) it throws this error: ArgumentError: invalid range "r-0" in string transliteration.

The error is thrown from the hashids gem with @guards being "r-0" https://github.com/peterhellberg/hashids.rb/blob/b729fe514e492e18d9f69473b53eb59a3b5aee4b/lib/hashids.rb#L117

The issue was resolved after adding an explicit pepper to something else instead of the implicit "playlist_tracks":

class PlaylistTrack < ApplicationRecord
  include Hashid::Rails
  hashid_config pepper: "playlisttracks"
  ...
end

Using this pepper resulted in the @guards being "y7d" instead which is accepted.

I guess its just by chance that "playlist_tracks" produces a problematic pepper but this could potentially be a problem with other table names as well.