rails-expert
Rails 7+ specialist that optimizes Active Record queries with includes/eagerload, implements Turbo Frames and Turbo Streams for partial page updates, configures Action Cable for WebSocket connections, sets up Sidekiq workers for background job processing, and writes comprehensive RSpec test suites. Use when building Rails 7+ web applications with Hotwire, real-time features, or background job processing. Invoke for Active Record optimization, Turbo Frames/Streams, Action Cable, Sidekiq, RSpec Rails.
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/jeffallan/claude-skills --skill rails-expert- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads rails-expert automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
Security audits
Independent scans of the skill's instructions and bundled files.
SKILL.md
The instructions your agent reads when the skill is triggered.
Rails Expert
Core Workflow
- Analyze requirements — Identify models, routes, real-time needs, background jobs
- Scaffold resources —
rails generate model User name:string email:string,rails generate controller Users - Run migrations —
rails db:migrateand verify schema withrails db:schema:dump- If migration fails: inspect
db/schema.rbfor conflicts, rollback withrails db:rollback, fix and retry
- If migration fails: inspect
- Implement — Write controllers, models, add Hotwire (see Reference Guide below)
- Validate —
bundle exec rspecmust pass;bundle exec rubocopfor style- If specs fail: check error output, fix failing examples, re-run with
--format documentationfor detail - If N+1 queries surface during review: add
includes/eager_load(see Common Patterns) and re-run specs
- If specs fail: check error output, fix failing examples, re-run with
- Optimize — Audit for N+1 queries, add missing indexes, add caching
Reference Guide
Load detailed guidance based on context:
| Topic | Reference | Load When |
|---|---|---|
| Hotwire/Turbo | references/hotwire-turbo.md | Turbo Frames, Streams, Stimulus controllers |
| Active Record | references/active-record.md | Models, associations, queries, performance |
| Background Jobs | references/background-jobs.md | Sidekiq, job design, queues, error handling |
| Testing | references/rspec-testing.md | Model/request/system specs, factories |
| API Development | references/api-development.md | API-only mode, serialization, authentication |
Common Patterns
N+1 Prevention with includes/eager_load
# BAD — triggers N+1
posts = Post.all
posts.each { |post| puts post.author.name }
# GOOD — eager load association
posts = Post.includes(:author).all
posts.each { |post| puts post.author.name }
# GOOD — eager_load forces a JOIN (useful when filtering on association)
posts = Post.eager_load(:author).where(authors: { verified: true })
Turbo Frame Setup (partial page update)
<%# app/views/posts/index.html.erb %>
<%= turbo_frame_tag "posts" do %>
<%= render @posts %>
<%= link_to "Load More", posts_path(page: @next_page) %>
<% end %>
<%# app/views/posts/_post.html.erb %>
<%= turbo_frame_tag dom_id(post) do %>
<h2><%= post.title %></h2>
<%= link_to "Edit", edit_post_path(post) %>
<% end %>
# app/controllers/posts_controller.rb
def index
@posts = Post.includes(:author).page(params[:page])
@next_page = @posts.next_page
end
Sidekiq Worker Template
# app/jobs/send_welcome_email_job.rb
class SendWelcomeEmailJob < ApplicationJob
queue_as :default
sidekiq_options retry: 3, dead: false
def perform(user_id)
user = User.find(user_id)
UserMailer.welcome(user).deliver_now
rescue ActiveRecord::RecordNotFound => e
Rails.logger.warn("SendWelcomeEmailJob: user #{user_id} not found — #{e.message}")
# Do not re-raise; record is gone, no point retrying
end
end
# Enqueue from controller or model callback
SendWelcomeEmailJob.perform_later(user.id)
Strong Parameters (controller template)
# app/controllers/posts_controller.rb
class PostsController < ApplicationController
before_action :set_post, only: %i[show edit update destroy]
def create
@post = Post.new(post_params)
if @post.save
redirect_to @post, notice: "Post created."
else
render :new, status: :unprocessable_entity
end
end
private
def set_post
@post = Post.find(params[:id])
end
def post_params
params.require(:post).permit(:title, :body, :published_at)
end
end
Constraints
MUST DO
- Prevent N+1 queries with
includes/eager_loadon every collection query involving associations - Write comprehensive specs targeting >95% coverage
- Use service objects for complex business logic; keep controllers thin
- Add database indexes for every column used in
WHERE,ORDER BY, orJOIN - Offload slow operations to Sidekiq — never run them synchronously in a request cycle
MUST NOT DO
- Skip migrations for schema changes
- Use raw SQL without sanitization (
sanitize_sqlor parameterized queries only) - Expose internal IDs in URLs without consideration
Output Templates
When implementing Rails features, provide:
- Migration file (if schema changes needed)
- Model file with associations and validations
- Controller with RESTful actions and strong parameters
- View files or Hotwire setup
- Spec files for models and requests
- Brief explanation of architectural decisions
Maintained by @jeffallan, Principal Consultant at Synergetic Solutions
FAQ
What does the rails-expert skill do?
Rails 7+ specialist that optimizes Active Record queries with includes/eagerload, implements Turbo Frames and Turbo Streams for partial page updates, configures Action Cable for WebSocket connections, sets up Sidekiq workers for background job processing, and writes comprehensive RSpec test suites. Use when building Rails 7+ web applications with Hotwire, real-time features, or background job processing. Invoke for Active Record optimization, Turbo Frames/Streams, Action Cable, Sidekiq, RSpec Rails.
How do I install rails-expert?
Run npx skills add https://github.com/jeffallan/claude-skills --skill rails-expert in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/rails-expert/ (personal) or .claude/skills/rails-expert/ (project).
Which AI agents can use rails-expert?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is rails-expert safe to install?
Security partners have reviewed it: Gen Agent Trust Hub flagged risks; Socket passed; Snyk passed; Runlayer passed; ZeroLeaks passed. As with any skill, read the SKILL.md and bundled scripts before installing.
Who maintains rails-expert?
It is published by jeffallan in jeffallan/claude-skills. It has 4,763 recorded installs.
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