public QueryableSingleRepository([NotNull] IQueryableSingle <TNav> singleItemQuery)
{
if (singleItemQuery == null)
{
throw new ArgumentNullException(nameof(singleItemQuery));
}
SingleItemQuery = singleItemQuery;
}
public IRestResource GetFullResource(IDeferredItem <TItem> item, IDataTransaction dataTransaction)
{
//TNav navItem = _navTools.NavExpression.Compile().Invoke(item.LoadedItem);
//var itemRepository = new LoadedItemRepository<TNav>(navItem);
IQueryableSingle <TNav> navigationQuery = item.Query.Select(_navTools.NavExpression).SingleDefferred();
var itemRepository = new QueryableSingleRepository <TNav>(navigationQuery);
var eventWrapper = new DataEventWrapper <TNav>(dataTransaction, itemRepository);
eventWrapper.TryWrapEvents(_navTools.RepoEvents);
var context = new FullEngineContext <TNav>(eventWrapper.Transaction, eventWrapper.Repository, _engineSubContext);
var deferredNavItem = new RepositoryDeferredItem <TNav>(itemRepository);
return(new EngineRestItem <TNav>(context, deferredNavItem));
}
/// <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);
}