Railsドキュメント(v6.0.2.1)

after_action(アクション名 [, オプション])

after_action :store_location
def store_location
  if request.fullpath !~ Regexp.new('\\A/users/.*\\z') && !request.xhr?
    session[:previous_url] = request.fullpath
  end
end

after_action :render_form, only: [:new :edit]
def render_form
  render 'form'
end

before_action :user1
before_action :user2

around_action(アクション名 [, オプション])

around_action :render_form, only: [:new :edit]
def render_form
  render 'form'
end

before_action :user1
before_action :user2

before_action(アクション名 [, オプション])

before_action :require_permission
def require_permission
  unless current_user.partner? || current_user.admin?
    redirect_to admin_root_path, alert: 'ここから先は管理者限定です！'
  end
end

before_action :render_form, only: [:new :edit]
def render_form
  render 'form'
end

before_action :user1
before_action :user2

before_destroy :delete_parents
private
  def delete_parents
    self.class.delete_by(parent_id: id)
  end

class BankAccount < ActiveRecord::Base
  before_save      EncryptionWrapper.new
  after_save       EncryptionWrapper.new
  after_initialize EncryptionWrapper.new
end
class EncryptionWrapper
  def before_save(record)
    record.credit_card_number = encrypt(record.credit_card_number)
  end
  def after_save(record)
    record.credit_card_number = decrypt(record.credit_card_number)
  end
  alias_method :after_initialize, :after_save
  private
    def encrypt(value)
      # Secrecy is committed
    end
    def decrypt(value)
      # Secrecy is unveiled
    end
end

after_initialize do |x|
  実行したい処理
end

after_initialize do |user|
  puts "初期化"
end

after_touch |x|
  実行したい処理
end

after_touch do |user|
  puts "タッチ"
end

define_model_callbacks(メソッド名 [, only: タイプ])

define_model_callbacks :initializer, only: :after

append_after_action(コールバック名 [, オプション])

append_after_action :verify_same_origin_request
def verify_same_origin_request
  if marked_for_same_origin_verification? && non_xhr_javascript_response?
    logger.warn CROSS_ORIGIN_JAVASCRIPT_WARNING if logger
    raise ActionController::InvalidCrossOriginRequest, CROSS_ORIGIN_JAVASCRIPT_WARNING
  end
end

append_around_action(コールバック名 [, オプション])

append_before_action(コールバック名 [, オプション])

prepend_after_action(コールバック名 [, オプション])

prepend_around_action(コールバック名 [, オプション])

prepend_before_action(コールバック名 [, オプション])

skip_after_action(コールバック名)

skip_around_action(コールバック名)

skip_before_action(コールバック名)