class GlobalID

def repad_gid(gid)

We removed the base64 padding character = during #to_param, now we're adding it back so decoding will work 
def repad_gid(gid)
  padding_chars = gid.length.modulo(4).zero? ? 0 : (4 - gid.length.modulo(4))
  gid + ('=' * padding_chars)
end