constraints

2 posts with the tag “constraints”

From script to stage · Part 07: Validation all the way down

Sep 30, 2026 - 13 min read

Every place a rule can live in a Cratis application, from the rules copied into the browser to Chronicle's append. What each layer can and can't guarantee, why a taken author name is caught in only one of them, and which rejections find their way back to a form field.

From script to stage · Part 05: Rules that hold when you write

Sep 30, 2026 - 15 min read

Sindre Alstad Wilting

Co-founder, Cratis

Checking a read model before you append enforces nothing. Constraints, concurrency scopes, decision reads and Arc aggregates check at write time, and each reaches a different set of appends.