undefined method `before_action' for ActionMailer

Question

Trying to attach file to mail via before_action filter:

class UserMailer < ActionMailer::Base
  before_action :add_logo_attachment

  layout 'mail'
  default from: "\"Admin\" <admin@site.com>",
      to: Proc.new {Admin.pluck(:email)}

  def send_mail
    mail(subject: 'Hello, admin!')
  end
  .
  .
  private

  def add_logo_attachment
    attachments.inline['logo.png'] = File.read(Rails.root.join('app/assets/images/logo.png'))
  end

end

And I get this error: undefined method `before_action' for UserMailer:Class There is the same example in Rails guides and I can't understand what's the difference between my code and the code in guides.

Answer 1

There's no callbacks for ActionMaler::Base in Rails 3

Answer 2

Check the beginning of your controller. Had a similar error where this...

  before_action :set_org, only: [:show, :edit, :update, :destroy]

got moved to above this accidently...

class OrgsController < ApplicationController

Move it back inside the class.

Answer 3

Try to

include AbstractController::Callbacks

in your mailer class and use before_filter

See this topic