rails

Development

Use when working with the Rails CLI — commands, generators, database tasks, test subcommands, rake tasks, flags, and argument completion. Triggers on: "rails", "Ruby on Rails", "bin/rails", "rails new", "rails generate", "rails server", "rails console", "rails dbconsole", "rails runner", "rails test", "rails routes", "rails destroy", "rails db", "rails credentials", "rails middleware", "rails notes", "rails dev:cache", "rails restart", "rails secret", "rails stats", "rails about", "rails boot", "rails initializers", "rails plugin", "rails tmp", "rails version", "rails devcontainer", "rails encrypted", "rails zeitwerk", "rails yarn", "rails scaffold", "rails model", "rails migration", "rails controller", "rails resource", "rails job", "rails mailer", "rails channel", "railsrc", ".railsrc", "config/database.yml".

QUICK START

How to use this skill

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I want to install this Agent Skill for this project in Codex.

Source SKILL.md: https://github.com/carapace-sh/carapace-bin/blob/HEAD/skills/rails/SKILL.md

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First, summarize what it does, its dependencies, license status if identifiable, and any risks. Show the exact files you propose to add under .agents/skills/rails/. Do not write files or run scripts until I approve.

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Copying this prompt does not install or run the skill. Review third-party files before use. Codex skill guide

Rails CLI In-Depth Reference

Complete reference for the Rails CLI surface — commands, generators, database tasks, rake tasks, flags, positional arguments, and shell completion targets. Built for creating a carapace completer.

Data Flow

bin/rails COMMAND [args] [options]
  ├── rails new          → AppGenerator (Thor)
  ├── rails generate     → GenerateCommand → Generator subclasses
  ├── rails server       → ServerCommand (Rack/Puma)
  ├── rails console      → ConsoleCommand (IRB)
  ├── rails dbconsole    → DbconsoleCommand (psql/mysql/sqlite3)
  ├── rails runner       → RunnerCommand (eval code)
  ├── rails test         → TestCommand → Minitest
  ├── rails routes       → RoutesCommand (router inspection)
  ├── rails db:          → Rake tasks (Active Record)
  ├── rails credentials  → CredentialsCommand (encrypted YAML)
  ├── rails encrypted    → EncryptedCommand (generic encrypted files)
  ├── rails notes        → NotesCommand (annotation grep)
  ├── rails query        → QueryCommand (Active Record REPL)
  └── rails <task>       → Rake fallback (Thor delegate)

Sub-Resources

Load the reference that matches your task. When in doubt, load multiple references.

Keywords	Reference
rails new, AppGenerator, --database, --javascript, --css, --api, --minimal, --skip-*, --template, --rc, .railsrc, --dev, --edge, --main, --devcontainer, PluginGenerator	references/rails-new.md
rails generate, rails destroy, generator subcommands, model, scaffold, resource, controller, migration, job, mailer, channel, mailbox, task, helper, jbuilder, system_test, integration_test, generator, application_record, benchmark, scaffold_controller, --skip-routes, --parent, --timestamps, --api, --queue, --assets, --actions, field:type:index, --pretend, --force, --skip, orm hook, template_engine hook, test_framework hook	references/generators.md
rails server, rails console, rails runner, rails dbconsole, rails routes, middleware, initializers, about, stats, boot, dev:cache, restart, secret, version, encrypted, credentials, notes, query, devcontainer, --port, --binding, --sandbox, --environment, --database, --unused, --expanded, --controller, --grep, --enroll, --disenroll	references/cli-commands.md
rails db:*, database rake tasks, migrate, schema, seed, rollback, create, drop, setup, reset, prepare, version, encryption, truncate, charset, collation, fixtures, test:db, multi-db, db:system:change, --to, VERSION, STEP, SCOPE, FIXTURES, FIXTURES_DIR	references/database.md
rails test, test:system, test:all, test:functionals, test:units, test:generators, test:models, test:helpers, test:channels, test:controllers, test:mailers, test:integration, test:jobs, test:mailboxes, test:db, --name, --verbose, --seed, --warnings, --environment	references/testing.md
rails log:clear, tmp:, time:zones, yarn:install, zeitwerk:check, action_mailbox:, action_text:install, active_storage:*, app:template, railties:install:migrations, javascript:install	references/rake-tasks.md

Quick Guide

How do I complete rails new flags? → references/rails-new.md
How do I complete rails generate <thing>? → references/generators.md
What flags does rails server accept? → references/cli-commands.md
What are all the db:* subcommands? → references/database.md
How do I complete test paths and subcommands? → references/testing.md
What --environment values are valid? → The string environment — value can be any string, typically development, test, production, or staging. Not enum-limited.
How does --database work in rails new? → references/rails-new.md
What field types does generate model accept? → references/generators.md
How does multi-db completion work for db:* tasks? → references/database.md
What are the rails credentials:* subcommands? → references/cli-commands.md
How does db:system:change --to= work? → references/database.md
What are the aliases for rails commands? → references/cli-commands.md
How do I complete rails encrypted:edit/show? → references/cli-commands.md