class Rails::Generators::MailboxGenerator

def application_mailbox_file_name
  "app/mailboxes/application_mailbox.rb"
end

def create_mailbox_file
  template "mailbox.rb", File.join("app/mailboxes", class_path, "#{file_name}_mailbox.rb")
  in_root do
    if behavior == :invoke && !File.exist?(application_mailbox_file_name)
      template "application_mailbox.rb", application_mailbox_file_name
    end
  end
end

def file_name # :doc:
  @_file_name ||= super.sub(/_mailbox\z/i, "")
end