Ruby on Rails code explainers

class Admin::AccountsController < Admin::BaseController
  before_action :set_account, only: :destroy
 
  def destroy

class Product < ApplicationRecord
  scope :search, ->(query) {
    return all if query.blank?
 

module Rack
  class MaintenanceMode
    RETRY_AFTER = 3600
 

module RequestTagging
  class Middleware
    def initialize(app)
      @app = app

class Order < ApplicationRecord
  belongs_to :customer
  has_many :line_items
  has_many :products, through: :line_items

class Document < ApplicationRecord
  class StaleObjectError < StandardError
    def initialize(id)
      super("Document ##{id} was modified by another process")

class BackfillUsersFullName < ActiveRecord::Migration[7.1]
  disable_ddl_transaction!
 
  BATCH_SIZE = 5_000

class ProjectsController < ApplicationController
  def new
    @project = current_account.projects.build
    load_form_collections

class Membership < ApplicationRecord
  belongs_to :organization
  belongs_to :user
 

class WebhookSignatureConstraint
  def initialize(provider)
    @provider = provider
  end

module UniqueJob
  extend ActiveSupport::Concern
 
  class_methods do

class OrderMailerPreview < ActionMailer::Preview
  def confirmation
    OrderMailer.confirmation(sample_order)
  end

class ApplicationController < ActionController::Base
  ALLOWED_REDIRECT_HOSTS = [nil, ENV.fetch("APP_HOST", "app.example.com")].freeze
 
  def store_return_to(location = request.fullpath)

namespace :counter_cache do
  desc "Recalculate comments_count for posts after a backfill"
  task warm_post_comments: :environment do
    scope = Post.where(comments_count: nil).or(Post.where("comments_count < 0"))

class ToastBroadcaster
  include ActionView::RecordIdentifier
 
  def self.broadcast_to(user, message:, type: :notice)

module Paginatable
  extend ActiveSupport::Concern
 
  private

class Api::MessagesController < ApiController
  before_action :authenticate_api_key!
 
  rate_limit to: 100,

class Order < ApplicationRecord
  include AASM
 
  belongs_to :warehouse