You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: user_mailer.rb
    path of file: ./repos/foreman/app/mailers
    
    the code of the file until where you have to start completion: class UserMailer < ApplicationMailer
  helper :reports

  def welcome(options 
    
  def welcome(options = {})
    user = options[:user]
    @login = user.login

    set_locale_for(user) do
      mail(:to => user.mail, :subject => _("Welcome to Foreman"))
    end
  end