scaffold-event-projection

To create a Marten event projection for an audit log, you scaffold a Projection class inheriting from EventProjection in your project's Projections directory. This transforms each event into a 1:1 queryable document, providing a transparent read model for tracking history without data aggregation.

A 1:1 event projection in event sourcing transforms each event into a dedicated queryable document. It is specifically used for building history tables, audit logs, and flattened stream data for reporting or analytics without requiring complex aggregation logic.

You configure Marten projections in an ASP.NET C# application by adding a line like options.Projections.Add<YourProjection>(ProjectionLifecycle.Async) within your Marten configuration extensions file, registering the projection class to run asynchronously.

No, this Marten event projection approach does not support aggregated read models. It specifically targets use cases like history tables, audit logs, and flattened streaming data by transforming each event into a 1:1 document per event without aggregation.

Yes, you can use this event projection scaffolding for flattened streaming data. It transforms each event into a dedicated queryable document, which is ideal for flattening stream data for reporting or analytics purposes without performing aggregations.