class Order < ApplicationRecord
  has_many :line_items, dependent: :destroy, inverse_of: :order

  accepts_nested_attributes_for :line_items,
    reject_if: :all_blank,
    allow_destroy: true

class OverdueInvoicesQuery
  def initialize(relation: Invoice.all, as_of: Time.current)
    @relation = relation
    @as_of = as_of
  end

require "loofah"

class HtmlSanitizer
  ALLOWED_TAGS  = %w[p br a strong em ul ol li blockquote code pre h2 h3].freeze
  ALLOWED_ATTRS = %w[href title].freeze
  SAFE_SCHEMES  = %w[http https mailto].freeze

class CreateMaintenanceTasks < ActiveRecord::Migration[7.0]
  def change
    create_table :maintenance_tasks do |t|
      t.string :name, null: false
      t.string :state, null: false, default: "pending"
      t.datetime :started_at

class CreateUsers < ActiveRecord::Migration[7.1]
  def change
    create_table :users do |t|
      t.string :name, null: false

      # Ciphertext is larger than plaintext, so use text columns.

class Contract
  INVALID = Object.new.freeze

  COERCERS = {
    string: ->(v) { v.is_a?(String) ? v : v.to_s },
    integer: ->(v) { Integer(v.to_s) rescue INVALID },

module DangerousAction
  extend ActiveSupport::Concern

  FRESH_WINDOW = 10.minutes

  class ConfirmationMismatch < StandardError; end

class Reminder < ApplicationRecord
  belongs_to :user

  validates :time_zone, inclusion: { in: ActiveSupport::TimeZone::MAPPING.values }
  validates :local_time, presence: true

module RequestStore
  def self.store
    Thread.current[:request_store] ||= {}
  end

  def self.fetch(key)

class NotifyFollowersJob
  include Sidekiq::Job

  sidekiq_options queue: :notifications, retry: 5

  def perform(post_id, actor_id)

class CircuitBreaker
  class CircuitOpenError < StandardError; end

  INCREMENT = <<~LUA.freeze
    local n = redis.call('INCR', KEYS[1])
    if n == 1 then redis.call('EXPIRE', KEYS[1], ARGV[1]) end

class CreateCustomerRevenueSummaries < ActiveRecord::Migration[7.0]
  def change
    create_view :customer_revenue_summaries, materialized: true, version: 1

    add_index :customer_revenue_summaries,
              :customer_id,