private Task <Validation <BaseError, PlexMediaSource> > MediaSourceMustExist(SynchronizePlexLibraries request) =>
_mediaSourceRepository.GetPlex(request.PlexMediaSourceId)
.Map(o => o.ToValidation <BaseError>("Plex media source does not exist."));
private Task <Validation <BaseError, PlexMediaSource> > PlexMediaSourceMustExist(
GetPlexConnectionParameters request) =>
_mediaSourceRepository.GetPlex(request.PlexMediaSourceId)
.Map(
v => v.ToValidation <BaseError>(
$"Plex media source {request.PlexMediaSourceId} does not exist."));