Rails 7+ specialist that optimizes Active Record queries with includes/eager_load, 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.
rails generate model User name:string email:string, rails generate controller Usersrails db:migrate and verify schema with rails db:schema:dump
db/schema.rb for conflicts, rollback with rails db:rollback, fix and retrybundle exec rspec must pass; bundle exec rubocop for style
--format documentation for detailincludes/eager_load (see Common Patterns) and re-run specsLoad 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 |
# 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 })
<%# 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
# 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)
# 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
includes/eager_load on every collection query involving associationsWHERE, ORDER BY, or JOINsanitize_sql or parameterized queries only)When implementing Rails features, provide: