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Aug 6, 2025 · Appending Events TIP For CQRS style command handlers that append events to an existing event stream, the Marten team very strongly recommends the FetchForWriting API. This API is used underneath the Wolverine Aggregate Handler Workflow that is probably the very simplest possible way to build command handlers with Marten event sourcing today.

Aug 6, 2025 · Stream identity effects the underlying database schema of the Event Store related tables. Namely, using string identities configures stream_id in the mt_events table to be varchar, whereas uuid would be used for GUIDs.

Jul 11, 2024 · The stream identity type is System.Guid, but the aggregate document Foo.Payment id type is PaymentId at Marten.Events.Projections.ProjectionOptions.AssertValidity(DocumentStore store)

Feb 12, 2023 · Definitely still store the raw Guid/string/int/long in the 'id' field in the document tables Use a new IQueryableMember type for the strong typed ids that 'bakes in' how to get the raw Guid/int/string/long from the object in its internals.

Aug 6, 2025 · Document Identity Besides being serializable, Marten's only other requirement for a .Net type to be a document is the existence of an identifier field or property that Marten can use as the primary key for the document type. The Id can be either a public field or property, and the name must be either id or Id or ID. As of this time, Marten supports these Id types: String. It …

Aug 6, 2025 · Querying Event and Stream Data Fetch Events for a Stream You can retrieve the events for a single stream at any time with the IEventStore.FetchStream() methods shown below:

Feb 19, 2022 · Marten requires the id with public setter and getter of string or Guid. We used the trick and added AggregateId with a strongly-typed backing field. We also informed Marten of the Identity attribute to use this field in its internals. Example aggregate can look like:

Jan 19, 2022 · That’s a useful pattern, and recently I’ve been asked multiple times how to use strongly typed ids with Marten. It appears that’s non-trivial. Marten requires a few things to work correctly: Id has to be string or Guid (or int, long if you’re just using document part), public Id with getter and setter, default constructor (not necessarily public). Let’s start with defining the base ...

Aug 26, 2024 · using var session = store.LightweightSession(); var stream = await session. Events.FetchForWriting(id); I can see the table being correctly crated in the database that holds the projections. But when I run the FetchForWriting command, I run into the following exception:

Aug 6, 2025 · In this usage, FetchForWriting() is finding the current state of the stream based on the stream id we passed in. If the Order aggregate is configured as:

According to docs and issue 3379 FetchForWriting API is only possible with single stream aggregation projections. Hence, I would expect some kind of exception / error ...

May 1, 2025 · @MindSwipe, in the constructor of the Summary projector I am specifying what property of the event to get the ID for Identity(x => x.SummaryId);.

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