Rails Fast Nav 
Commands to move between files in a Rails application.
Features
- Navigate to all known files (alt+r) [command.railsFastNavigation]
- Switch to model [command.railsFastSwitchToModel]
- Switch to controller [command.railsSwitchToController]
- Switch to view from controllers and mailers [command.railsFastSwitchToView]
- Switch to test/spec [command.railsFastSwitchToTest] + alias [command.railsFastSwitchToSpec]
- Switch to fixture [command.railsFastSwitchToFixture]
- Switch to factory [command.railsFastSwitchToFactory]
- Create View [command.railsCreateView]
- Create Spec [command.railsCreateSpec]
- Create Factory [command.railsCreateFactory]
Screenshot

Configuration
Set the Rails app directory if you have a non-standard directory layout:
"rails.appDir": "lib/app"
Change the default view extension from html.erb:
"rails.viewFileExtension": "json.jbuilder"
Multiple app roots (Packwerk, Rails engines)
For repositories with several app directories (Packwerk packs, Rails engines, or custom components), set rails.appDirs to glob patterns relative to the Rails root. When rails.appDirs is empty or omitted, only rails.appDir is used (default app).
"rails.appDirs": ["app", "packs/*/app", "engines/*/app"]
Navigation picks the longest matching app root for the current file, so files under packs/billing/app/... resolve specs and views next to packs/billing/spec/ when that folder exists.