Anti-corruption Layer in C#: Three Seams in a Rails Migration Project

▤ Summary

This article explains how to use an anti-corruption layer to separate a new .NET domain model from legacy Rails data during a migration. It walks through three concrete seams: nullable fields and JSONB-backed read models, legacy exercise kind mappings, and schedule conflict handling in memory instead of DbContext behavior. The examples show how to preserve domain integrity while isolating legacy persistence details behind adapters and mappers. The piece also highlights testing and pattern-matching techniques that help keep migration code stable as the system evolves.

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