ruby

class Comment < ApplicationRecord
  belongs_to :post
  belongs_to :author, class_name: "User"

  has_rich_text :body

class ProductsController < ApplicationController
  before_action :set_product, only: %i[edit update]

  def index
    @products = Product.order(:name)
  end

module Paginatable
  extend ActiveSupport::Concern

  MAX_PER_PAGE = 100
  DEFAULT_PER_PAGE = 25

cookies.encrypted[:trusted_device] = {
  value: { user_id: current_user.id, fingerprint: device_fingerprint }.to_json,
  expires: 30.days.from_now,
  httponly: true,
  secure: Rails.env.production?,
  same_site: :strict,

# app/channels/chat_channel.rb
class ChatChannel < ApplicationCable::Channel
  def subscribed
    # Subscribe to a specific room
    room = Room.find(params[:room_id])

Rails.application.routes.draw do
  namespace :api do
    namespace :v1 do
      resources :posts do
        resources :comments, only: [:index, :create]
      end

class Tag < ApplicationRecord
  has_many :taggings, dependent: :destroy

  scope :top, ->(limit = 20) {
    joins(:taggings)
      .group(Arel.sql("tags.id"))

require "timeout"

module HealthCheck
  class Probe
    Result = Struct.new(:name, :status, :latency_ms, :critical, :error, keyword_init: true) do
      def healthy?

import { Controller } from "@hotwired/stimulus"

export default class extends Controller {
  static targets = ["bar", "percent", "status"]
  static values = {
    current: { type: Number, default: 0 },

class AddDeletedAtToPosts < ActiveRecord::Migration[6.1]
  def change
    add_column :posts, :deleted_at, :datetime
    add_index :posts, :deleted_at
  end
end

class FeatureFlag < ApplicationRecord
  validates :key, presence: true, uniqueness: true
  validates :percentage, inclusion: { in: 0..100 }

  after_commit :expire_cache

# app/validators/order_validator.rb
class OrderValidator < ActiveModel::Validator
  def validate(record)
    validate_order_total(record)
    validate_items_availability(record)
    validate_shipping_address(record)