How do I get a constant recognized in my mailer file?

Question

With Rails 5, how do I get a constant recognized in my mailer file? I have this file, app/mailers/user_notifier.rb,

class UserNotifier < ActionMailer::Base
    ...

  # send notification email to user about the price
  def send_confirmation_email(user_id)
    @user = User.find(user_id)
    mail( :to => @user.email,
    :subject => Constants::EMAIL_CONFIRMATION_SUBJECT )
  end

end

but when it gets to the line, ":subject => Constants::EMAIL_CONFIRMATION_SUBJECT )" it dies with the error

    uninitialized constant Constants::EMAIL_CONFIRMATION_SUBJECT

despite the fact i have the constant defined in my config/initializers/global.rb file

module Constants

  # Subject for email confirmations
  EMAIL_CONFIRMATION_SUBJECT = "Please confirm your email."

end

How do I fix this?

Answer 1

You don't need to prefix the constant with the module name. The constant will be available in the global scope.

email:

def send_confirmation_email(user_id)
 @user = User.find(user_id)
 mail( :to => @user.email,
  :subject => EMAIL_CONFIRMATION_SUBJECT )
end

config/initializers/global.rb

EMAIL_CONFIRMATION_SUBJECT = "Please confirm your email."

Although, I've got to suggest you use the internationalization in Rails since it's built just for this purpose http://guides.rubyonrails.org/i18n.html