Event versioning and upcasting Added in 1.10.0

Evolving event schemas in Marten without rewriting history — event type name mapping for namespace moves and class renames, additive vs breaking payload changes, upcasters (CLR-typed, raw JSON, async), side-by-side schema versions with MapEventTypeWithSchemaVersion, and how versioning interacts with projections and rebuilds.

Use when renaming or moving an event type, adding or removing a field on an event that already has stored instances, or answering 'how do we change this event now that there are a million of them'.

Skill details

• Skill name: marten-event-versioning-and-upcasting
• Applies to: marten
• Tags: marten, event-sourcing, versioning, upcasting, schema-migration, projections, advanced
• Added in: 1.10.0
• License: Proprietary. Copyright JasperFx Software LLC.

This skill is part of a paid product. The full content of marten-event-versioning-and-upcasting (patterns, code examples, conventions, and guidance) is distributed only to licensed customers.

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