重写Devise Invitable ` `invite!`方法，以便将附件添加到邀请电子邮件- Rails

# app/services/invitation_service.rb
class InvitationService
  def initialize(user, recipient_email, attachment_path)
    @user = user
    @recipient_email = recipient_email
    @attachment_path = attachment_path
  end

  def invite!
    invitation = @user.invitations.new(email: @recipient_email)
    invitation.deliver_now if invitation.save
  end

  private

  def deliver_now
    mail = Devise.mailer.invitation_instructions(@user, @recipient_email)
    mail.attachments['invitation.pdf'] = File.read(@attachment_path) if File.exist?(@attachment_path)
    mail.deliver_now
  end
end

# app/controllers/invitations_controller.rb
class InvitationsController < ApplicationController
  def create
    @user = current_user
    recipient_email = params[:email]
    attachment_path = Rails.root.join('public', 'invitation.pdf')

    InvitationService.new(@user, recipient_email, attachment_path).invite!

    redirect_to root_path, notice: 'Invitation sent successfully.'
  end
end