/// <exception cref="T:System.ArgumentOutOfRangeException">Thrown when sort order option is not provided.</exception>
private async Task <Func <SortDescriptor <TIndexItem>, IPromise <IList <ISort> > > > CreateSort(IEnumerable <SortOptionArgs> sortOptions)
{
var descriptor = new SortDescriptor <TIndexItem>();
foreach (var sortOption in sortOptions)
{
bool isTextField;
var translatableProperty = sortOption.PropertyName.Split('.');
if (translatableProperty.Length == 2)
{
isTextField = string.IsNullOrWhiteSpace(translatableProperty[0])
? await _elasticSearchService.CheckIfFieldTypeIsTextAsync <TIndexItem>(translatableProperty[1])
: await _elasticSearchService.CheckIfFieldTypeIsTextAsync <TIndexItem>(translatableProperty[1], translatableProperty[0]);
}
else
{
isTextField = string.IsNullOrWhiteSpace(sortOption.ParentPropertyName)
? await _elasticSearchService.CheckIfFieldTypeIsTextAsync <TIndexItem>(sortOption.PropertyName)
: await _elasticSearchService.CheckIfFieldTypeIsTextAsync <TIndexItem>(sortOption.PropertyName, sortOption.ParentPropertyName);
}
if (isTextField)
{
sortOption.PropertyName = string.IsNullOrWhiteSpace(sortOption.ParentPropertyName)
? $"{sortOption.PropertyName}.keyword"
: $"{sortOption.ParentPropertyName}.{sortOption.PropertyName}.keyword";
}
switch (sortOption.SortOrder)
{
case SortOrder.Ascending:
SortAscending(sortOption, descriptor);
break;
case SortOrder.Descending:
SortDescending(sortOption, descriptor);
break;
default:
throw new ArgumentOutOfRangeException(nameof(sortOption.SortOrder), sortOption.SortOrder, null);
}
}
IPromise <IList <ISort> > Sorting(SortDescriptor <TIndexItem> sortDescriptor) => descriptor;
return(Sorting);
}