Ruby code explainers

class BulkImporter
  BATCH_SIZE = 500
 
  def initialize(records)

class Credentials
  SENSITIVE = %i[password api_key secret_token access_key].freeze
  REDACTED = "[REDACTED]".freeze
 

module Multitenant
  extend ActiveSupport::Concern
 
  included do

module Api
  module V1
    class BaseController < ActionController::API
      rescue_from StandardError, with: :render_internal_error

require "openssl"
require "base64"
 
module WebhookSignature

class CartMergeService
  def initialize(guest_cart:, user_cart:)
    @guest_cart = guest_cart
    @user_cart = user_cart

require 'monitor'
 
class TokenBucket
  include MonitorMixin

class Product < ApplicationRecord
  belongs_to :account
 
  after_save :record_audit_trail

class User < ApplicationRecord
  store_accessor :preferences,
    :theme,
    :timezone,

require "time"
require "tzinfo"
 
module TimeConverter

class Subscription < ApplicationRecord
  belongs_to :account
 
  enum :status, {

class InactiveAccountCleanup
  BATCH_SIZE = 500
  INACTIVITY_THRESHOLD = 18.months
 

class ArticleSerializer < ActiveModel::Serializer
  attributes :id, :title, :slug, :excerpt, :reading_time, :published_at, :url
 
  belongs_to :author, serializer: UserSerializer

def collatz_lengths
  Enumerator.new do |y|
    n = 1
    loop do

require "set"
 
class FuzzySearch
  def initialize(candidates)

class SearchIndexReconciler
  DEBOUNCE_WINDOW = 5.seconds
 
  def self.schedule(record)

class ParamCoercer
  TYPES = {
    integer: ->(v) { Integer(v) },
    float:   ->(v) { Float(v) },

module Api
  module V2
    class ArticlesController < Api::BaseController
      before_action :set_article, only: %i[show update destroy]