/// <summary>
/// Eagerly fetches a collection of 'grandchild' objects from child object(s) which have themselves been fetched.
/// </summary>
/// <returns>An object equivalent to the original query.</returns>
/// <param name="query">A query in which a child object or collection of objects has been fetched.</param>
/// <param name="getterExpression">An expression indicating the collection of grandchild objects to be fetched.</param>
/// <typeparam name="TQueried">The queried type.</typeparam>
/// <typeparam name="TChild">The type of the child object which has been fetched.</typeparam>
/// <typeparam name="TGrandchild">The type of the grandchild objects which are to be fetched.</typeparam>
public IQueryableWithEagerFetching <TQueried, TGrandchild> FetchGrandchildren <TQueried, TChild, TGrandchild>(IQueryableWithEagerFetching <TQueried, TChild> query, Expression <Func <TChild, IEnumerable <TGrandchild> > > getterExpression)
{
return(new NoOpEagerFetchQueryableAdapter <TQueried, TGrandchild>(query));
}
/// <summary>
/// Eagerly fetches a collection of 'grandchild' objects from child object(s) which have themselves been fetched.
/// </summary>
/// <returns>An object equivalent to the original query.</returns>
/// <param name="query">A query in which a child object or collection of objects has been fetched.</param>
/// <param name="getterExpression">An expression indicating the collection of grandchild objects to be fetched.</param>
/// <typeparam name="TQueried">The queried type.</typeparam>
/// <typeparam name="TChild">The type of the child object which has been fetched.</typeparam>
/// <typeparam name="TGrandchild">The type of the grandchild objects which are to be fetched.</typeparam>
public IQueryableWithEagerFetching <TQueried, TGrandchild> FetchGrandchildren <TQueried, TChild, TGrandchild>(IQueryableWithEagerFetching <TQueried, TChild> query,
Expression <Func <TChild, IEnumerable <TGrandchild> > > getterExpression)
{
if (query == null)
{
throw new ArgumentNullException(nameof(query));
}
if (!(query.Provider is NhQueryProvider))
{
throw new ArgumentException($"The query provider must be an instance of {typeof(NhQueryProvider).FullName}.", nameof(query));
}
var queryToUse = GetNhFetchRequest <TQueried, TChild>(query);
var nhFetchRequest = EagerFetchingExtensionMethods.ThenFetchMany(queryToUse, getterExpression);
return(new QueryableWithFetchingAdapter <TQueried, TGrandchild>(nhFetchRequest));
}