[Bug]: SourceCache ChangeSets are sent out of order when Item is updated right after it's added #991
Description
Describe the bug 🐞
When an Item in a SourceCache is edited and updated as a reaction to that item being added to the source cache, then OnItemAdded and OnItemUpdated will be called out of order in other subscriptions.
The order in which the streams are subscribed to might also play a role in this behaviour.
Step to reproduce
The following test fails because OnItemUpdated is called before OnItemAdded.
internal record Item(Guid Id, string Name);
internal sealed class Tests
{
private readonly CompositeDisposable _disposable = new();
private readonly SourceCache<Item, Guid> _sourceCache = new(item => item.Id);
private Item _latest;
[SetUp]
public void Setup()
{
_sourceCache.Connect()
.OnItemAdded(item => _sourceCache.AddOrUpdate(item with { Name = "Updated"}))
.Subscribe()
.DisposeWith(_disposable);
_sourceCache
.Connect()
.OnItemAdded(item => _latest = item)
.OnItemUpdated((item, _) => _latest = item)
.Subscribe()
.DisposeWith(_disposable);
_sourceCache.AddOrUpdate(new Item(Guid.NewGuid(), "Added"));
}
[TearDown]
public void TearDown() => _disposable.Dispose();
[Test]
public void Then_latest_should_be_updated()
{
_latest.Name.Should().Be("Updated");
}
}Reproduction repository
https://github.com/HyPhil/BugReport.DynamicData.001
Expected behavior
Test should pass
Screenshots 🖼️
No response
IDE
Rider Windows
Operating system
Windows
Version
10
Device
No response
DynamicData Version
9.2.1
Additional information ℹ️
No response