ruby

class ImportResult
  RowError = Struct.new(:line, :messages)

  attr_reader :imported, :row_errors

  def initialize

class DeliveryObserver
  def self.delivered_email(message)
    new(message).record
  end

  def initialize(message)

require 'ipaddr'
require 'resolv'

uri = URI.parse(params[:url])
allowed_hosts = %w[images.example-cdn.com api.partner.com]

class PriceBreakdown < Struct.new(:subtotal_cents, :discount_cents, :tax_cents, keyword_init: true)
  def initialize(*)
    super
    freeze
  end

class LastSeenTracker
  THROTTLE = 5.minutes
  PENDING_KEY = "pending:last_seen".freeze

  class << self
    def touch(user_id, at: Time.current)

class CreateReservations < ActiveRecord::Migration[7.1]
  def up
    enable_extension "btree_gist" unless extension_enabled?("btree_gist")

    create_table :reservations do |t|
      t.references :room, null: false, foreign_key: true

# Basic exception handling
begin
  result = 10 / 0
rescue ZeroDivisionError => e
  puts "Error: #{e.message}"
  result = nil

class CommentsController < ApplicationController
  before_action :set_post

  def create
    @comment = @post.comments.build(comment_params)

import { StreamActions } from "@hotwired/turbo"

StreamActions.flash = function () {
  const container = document.getElementById("flashes")
  if (!container) return

class ButtonComponent < ViewComponent::Base
  VARIANTS = {
    primary: "bg-blue-600 hover:bg-blue-700 text-white",
    secondary: "bg-gray-200 hover:bg-gray-300 text-gray-900",
    danger: "bg-red-600 hover:bg-red-700 text-white"
  }.freeze

<%= form_with url: bulk_update_orders_path, method: :patch, data: { turbo_confirm: "Update selected orders?" } do %>
  <div class="batch-toolbar">
    <%= select_tag :status,
          options_for_select(Order.statuses.keys.map { |s| [s.humanize, s] }),
          prompt: "Set status to\u2026" %>
    <%= submit_tag "Apply to selected", class: "btn" %>

# Gemfile
gem 'view_component'

# app/components/button_component.rb
class ButtonComponent < ViewComponent::Base
  VARIANTS = %w[primary secondary danger].freeze