public IEnumerable <BoundaryLevel> FindRelatedByBoundaryLevel(long boundaryLevelId)
{
var boundaryLevel = _cache.GetOrCreate(boundaryLevelId, cacheEntry => Find(boundaryLevelId));
if (boundaryLevel == null)
{
throw new ArgumentException("Boundary Level does not exist", nameof(boundaryLevelId));
}
return(FindByGeographicLevel(boundaryLevel.Level));
}
