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# Whetrails — Project Handoff
## What this is
A Ruby gem that makes ActiveRecord callback and validation chains visible to developers.
When a Rails developer calls `.save` on a model, Rails fires a chain of callbacks and validations in a specific order. These are registered in scattered places (the model file, concerns, gems) and Rails never surfaces the full picture in one place. Whetrails extracts and displays that chain: what fires, in what order, where it's defined, and under what conditions.
This is the first half of a two-part tool. The second half (not yet built) uses the extracted chain as input to a test coverage gap analyzer — showing which callbacks and validators are never exercised by the test suite.
## Current state (as of 2026-06-08)
Three layers are complete:
1. **Core inspector** — extracts the full chain from any ActiveRecord model class at runtime
2. **CLI**`whetrails inspect <ModelName>` boots the host Rails app and renders the chain to the terminal
3. **Rails engine** — browser UI mounted at `/whetrails`, sidebar model list, lifecycle timeline with vscode source links
## Build order
```
[DONE] 1. Gem core lib/whetrails/inspector.rb
[DONE] 2. CLI exe/whetrails + lib/whetrails/cli.rb
[DONE] 3. Rails engine browser UI mounted at /whetrails
[NEXT] 4. Test gap layer uses chain data to find uncovered callbacks/validators
```
## Repository
- Gitea: http://localhost:3000/bill/whetrails
- Branch: main