ruby

#!/usr/bin/env bash
set -euo pipefail

bundle exec bundler-audit check --update
npm audit --audit-level=high
pip-audit --strict

class Timer
  def self.measure
    start_time = Time.now
    yield if block_given?
    end_time = Time.now
    end_time - start_time

# Gemfile
gem 'dry-types'
gem 'dry-struct'

require 'dry-types'
require 'dry-struct'

# Generate engine
# rails plugin new billing --mountable

# lib/billing/engine.rb
module Billing
  class Engine < ::Rails::Engine

# app/policies/post_policy.rb
class PostPolicy < ApplicationPolicy
  class Scope < Scope
    def resolve
      if user.admin?
        scope.all

class UserSearchQuery
  def initialize(relation = User.all)
    @relation = relation
  end

  def call(params)

# Gemfile
gem 'draper'

# app/decorators/user_decorator.rb
class UserDecorator < Draper::Decorator
  delegate_all

# Basic Ractor usage
ractor = Ractor.new do
  # This runs in parallel, isolated from main thread
  result = heavy_computation
  result
end

# Gemfile
gem 'graphql'

# Installation
# rails generate graphql:install

# Gemfile
group :development do
  gem 'rack-mini-profiler'
  gem 'memory_profiler'
  gem 'stackprof'  # For flamegraphs
  gem 'bullet'     # N+1 detection

class UserNotificationJob < ApplicationJob
  queue_as :default

  # Retry up to 5 times with exponential backoff
  retry_on StandardError, wait: :exponentially_longer, attempts: 5

require 'rails_helper'

RSpec.describe User, type: :model do
  subject(:user) { build(:user) }

  describe 'validations' do