Casting Transformer QueryInput

CastingQueryInput.cs

  [TestFixture]
	public class TransformerQueryInputTests : RavenTestBase
	{
		[Test]
		public void CanCastQueryInput()
		{
			using (var store = NewDocumentStore())
			{
				new FooTransformer().Execute(store);

				using (var session = store.OpenSession())
				{
					session.Store(new Foo { Id = "foos/1", Things = { "hello", "there" } });
					session.SaveChanges();

					var results = session.Load<FooTransformer, FooTransformer.Result>(
						"foos/1",
						configuration => configuration.AddQueryParam("take", 1)
						);

					Assert.AreEqual(1, results.Keys.Count);
				}
			}
		}

		public class Foo
		{
			public string Id { get; set; }
			public List<string> Things { get; set; }

			public Foo()
			{
				Things = new List<string>();
			}
		}

		public class FooTransformer : AbstractTransformerCreationTask<Foo>
		{
			public class Result
			{
				public List<string> Keys { get; set; }
			}

			public FooTransformer()
			{
				TransformResults = foos => from foo in foos
										   select new
										   {
											   Keys = foo.Things.Take(Query("take").Value<int>())
										   };
			}
		}
	}