scaffold-update-operation

To add an update operation to an event-sourced backend, you define a Domain Event, create a corresponding Command, scaffold an endpoint, and update read-model projections. This appends state changes to the event stream deterministically using the Aggregate pattern.

Implementing PUT or PATCH updates using event sourcing requires appending a Domain Event to the stream rather than mutating state directly. You load the current state via an Aggregate, apply the change as a pure function, and project the new event to update read models.

In an event-sourced update, a Command represents the intent to change state, such as a PUT or PATCH request. The backend processes this Command, applies it to the loaded Aggregate, and appends a corresponding Domain Event to the event stream to capture the actual state change.

Yes, this scaffold includes updating read-model projections. After the update Domain Event is appended to the event stream, the blueprint guides you through wiring the necessary projection updates so the read models reflect the new resource state.

Yes, the blueprint enforces deterministic state changes by using a pure-function style. It leverages the Aggregate pattern to load existing state and apply updates, ensuring that appending to the event stream yields consistent and predictable outcomes.