ruby

class CreateTags < ActiveRecord::Migration[7.0]
  def change
    create_table :tags do |t|
      t.string :name, null: false
      t.integer :taggings_count, null: false, default: 0
      t.timestamps

# Basic matching
email = "user@example.com"
email =~ /@/  # => 4 (position of match)
email.match?(/@/)  # => true

# Capture groups

class JsonLogFormatter < ActiveSupport::Logger::SimpleFormatter
  def call(severity, timestamp, _progname, message)
    if message.is_a?(Hash)
      entry = {
        ts: timestamp.utc.iso8601(3),
        level: severity

class Rack::Attack
  Rack::Attack.cache.store = ActiveSupport::Cache::RedisCacheStore.new(url: ENV['REDIS_URL'])

  safelist('allow-localhost') do |req|
    req.ip == '127.0.0.1' || req.ip == '::1'
  end

Rails.application.config.session_store(
  :cookie_store,
  key: '_codesnips_session',
  secure: Rails.env.production?,
  httponly: true,
  same_site: :lax,

<div id="projects">
  <% projects.each do |project| %>
    <% cache project do %>
      <%= render project %>
    <% end %>
  <% end %>

# Create table migration
class CreateUsers < ActiveRecord::Migration[7.0]
  def change
    create_table :users do |t|
      t.string :email, null: false, index: { unique: true }
      t.string :name, null: false

class SubscriptionsController < ApplicationController
  def new
    @subscription = current_account.subscriptions.new
  end

  def create

class CspReportsController < ActionController::API
  def create
    Rails.logger.warn({
      event: 'csp_report',
      report: params.to_unsafe_h,
      ip: request.remote_ip,

class ProcessUploadJob < ApplicationJob
  queue_as :default

  retry_on StandardError, wait: :exponentially_longer, attempts: 5
  discard_on ActiveJob::DeserializationError

class AddOptimisticLockingToDocuments < ActiveRecord::Migration[7.1]
  def change
    add_column :documents, :lock_version, :integer, null: false, default: 0
    add_index :documents, :updated_at
  end
end

class CreateUserStatsView < ActiveRecord::Migration[6.1]
  def up
    execute <<-SQL
      CREATE VIEW user_stats AS
      SELECT
        users.id AS user_id,