activerecord

class CreateAuditLogs < ActiveRecord::Migration[7.1]
  def change
    create_table :audit_logs do |t|
      t.references :auditable, polymorphic: true, null: false
      t.string :actor
      t.string :action, null: false

class AddCommentsCountToPosts < ActiveRecord::Migration[6.1]
  def up
    add_column :posts, :comments_count, :integer, default: 0, null: false

    # Populate existing counts
    Post.find_each do |post|

class ReportsController < ApplicationController
  def monthly_sales
    year = params.fetch(:year, Date.current.year).to_i
    rows = Order.monthly_sales(year: year)
    @report = MonthlySalesReport.new(rows, year: year)

class User < ApplicationRecord
  has_many :posts, foreign_key: :author_id

  validates :email, presence: true,
                    uniqueness: { case_sensitive: false },
                    format: { with: URI::MailTo::EMAIL_REGEXP }

module KeysetPaginatable
  extend ActiveSupport::Concern

  class_methods do
    def keyset_page(cursor: nil, limit: 20, direction: :desc)
      limit = limit.to_i.clamp(1, 100)

class PopularPostsQuery
  def initialize(relation = Post.all)
    @relation = relation
  end

  def call(timeframe: 7.days, min_views: 100, limit: 20)

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

class CreateComments < ActiveRecord::Migration[6.1]
  def change
    create_table :comments do |t|
      t.references :commentable, polymorphic: true, null: false
      t.references :author, null: false, foreign_key: { to_table: :users }
      t.text :body, null: false

class AddSlugToPosts < ActiveRecord::Migration[7.1]
  def change
    add_column :posts, :slug, :string, null: false
    add_index :posts, :slug, unique: true
  end
end

class AddSlugToArticles < ActiveRecord::Migration[7.1]
  def change
    add_column :articles, :slug, :string
    add_index :articles, :slug, unique: true

    reversible do |dir|