Skip the migration writes that change nothing, without skipping the ones that matter
Skip the migration writes that change nothing, without skipping the ones that matter Key takeaways END STATE: a re-run that writes only what differs, with a false-SAME test suite you run BEFORE trusting it with a write. Our canonicaliser nulled any object holding an empty text key. A mention's attrs carries one, so attrs.id vanished and two DIFFERENT users hashed the same. Fixed by guarding on…
In order to optimize migration processes, focus on re-writing only the changes instead of rewriting everything, while ensuring that skipped writes are actually the same. To achieve this, a false-SAME test suite is used before trusting the write. The canonicaliser removes any object containing an empty text key, and a mention's attributes carry a unique identifier, so the attrs.id is removed.
To prevent false SAME issues, compare the planned value against the destination, not the source, and pick the hasher based on the body format, not the product name. Implement a harness to validate the process and ensure it disregards minor differences while catching real edits. Afterward, verify that both positive and negative controls produce the expected 'SAME' or 'DIFFERENT' results.
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