public async Task <RestItemData> GetDataAsync(IEnumerable <string> fieldNames)
{
var fieldAuth = new FieldAuthChecker <TItem>(_context.Fields, _context.AuthorizationChecker, _item);
IEnumerable <string> fields = fieldAuth.GetOrEnsureFields(fieldNames, 0);
var selector = new QueryableFieldSelector <TItem>(_context.Fields, fields);
var loadedObjects = await selector.SelectFieldsOnlyAsync(_item.Query, _context.Repository.ForEachAsync);
RestItemData loadedObject = ItemQueryHelper.SingleOrThrow(loadedObjects);
return(loadedObject);
}
/// <summary>
/// Loads a single scalar field reader from a single <see cref="itemQuery"/>.
/// </summary>
public static async Task <object> LoadScalarValueAsync <TItem>([NotNull] IFieldReader <TItem> reader, IQueryableSingle <TItem> itemQuery, ForEachAsyncDelegate <object> forEachAsync)
{
if (reader == null)
{
throw new ArgumentNullException(nameof(reader));
}
ParameterExpression itemPram = Expression.Parameter(typeof(TItem), "itm");
Expression selectExpression = reader.GetSelectExpression(itemPram);
IQueryable selectScalarOnlyQuery = ExpressionTreeHelpers.GetSelectExpressionQuery(itemQuery, itemPram, selectExpression);
object loadedValue = await ItemQueryHelper.SingleOrCreateAsync(selectScalarOnlyQuery, forEachAsync, () => throw new ParentItemNotFoundException());
if (reader.Replacer != null)
{
await reader.Replacer.LoadAsync(itemQuery);
return(reader.Replacer.GetReplacement(loadedValue));
}
return(loadedValue);
}