Raven4BugPatchCommand.cs

using Raven.Client.Documents;
using Raven.Client.Documents.Commands.Batches;
using Raven.Client.Documents.Operations;
using Raven.Client.Documents.Queries;
using System;
using System.Collections.Generic;
using System.Threading.Tasks;

namespace ConsoleApp2
{
	class Program
	{
		public class Person
		{
			public string Id { get; set; }
			public string Text { get; set; }
			public List<UserChange> Modifications { get; set; }
			public class UserChange
			{
				public string Id { get; set; }

				public DateTime Timestamp { get; set; }
			}
		}

		static void Main()
		{
			MainAsync().Wait();
		}

		static async Task MainAsync()
		{
			using (var store = new DocumentStore
			{
				Urls = new[] { "http://live-test.ravendb.net" },
				Database = "test"
			})
			{
				store.Initialize();

				#region Delete all documents in the DB --------------

				var operation = await store.Operations.SendAsync(new DeleteByQueryOperation(
					new IndexQuery { Query = "from @all_docs as d" },
					new QueryOperationOptions
					{
						RetrieveDetails = true
					}
				));
				await operation.WaitForCompletionAsync<BulkOperationResult>();

				#endregion ------------------------------------------

				// The document ID for future patching
				string personId = null;

				using (var s = store.OpenAsyncSession())
				{
					#region Seed data -----------------------------------

					for (var i = 1; i < 3; i++)
					{
						var p = new Person
						{
							Modifications = new List<Person.UserChange>
							{
								new Person.UserChange { Id = "" + i, Timestamp = DateTime.Now }
							}
						};
						await s.StoreAsync(p);
						personId = p.Id;
					}
					await s.SaveChangesAsync();

					#endregion ------------------------------------------

					s.Advanced.Defer(
						new PatchCommandData(
							personId,
							null,
							new PatchRequest { Script = $@"this.Text = 'aaa';" },
							null));

					Person person = await s.LoadAsync<Person>(personId);
					Console.WriteLine($"Text = '{person.Text}' (expected ''). UserChange.Count = {person.Modifications.Count} (expected 1)");
					await s.SaveChangesAsync();

					// BUG: 'Modifications' collection has 2 records. Why?
					person = await s.LoadAsync<Person>(personId);
					Console.WriteLine($"Text = '{person.Text}' (expected 'aaa'). UserChange.Count = {person.Modifications.Count} (expected 1)");
				}

				Console.WriteLine("The end!");
			}
		}
	}
}