public IEnumerable <RecordViewModel> GetCategoryRecords(Guid?categoryId)
{
var filter = $"CategoryId {(categoryId.HasValue ? $"= '{categoryId.Value}'" : "is null")}";
var records = _storageDb.GetCategoryRecords(categoryId)
.OrderBy(x => x.Order)
.DeepMap <RecordViewModel[]>();
return(records);
}