Claude Code

Upgrade an old Rails app

A developer used an AI agent to bring a ten-year-old Rails 5.2 app up to Rails 8, the kind of upgrade that's usually painful by hand.

Steps

  1. Make sure the tests run first.
  2. Ask for the upgrade in steps.
  3. Test after each step.

Prompt you can copy

Upgrade this Rails 5.2 app one major version at a time and keep the tests passing.

What you get

The developer described it as a concrete success.

Source

hn ·

For Developers. Claude Code. Added . Shared by @cypherfox.

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