How can I send emails in Rails 3 using the recipient's locale?

Question

How can I send mails in a mailer using the recipient\'s locale. I have the preferred locale for each user in the database. Notice this is different from the current locale (I18n

Answer 1

None of the above is really working since the version 3 to translate both subject and content and be sure that the locale is reseted back to the original one... so I did the following (all mailer inherit from that class:

class ResourceMailer < ActionMailer::Base

  def mail(headers={}, &block)
    I18n.locale = mail_locale
    super
  ensure
    reset_locale
  end

  def i18n_subject(options = {})
    I18n.locale = mail_locale
    mailer_scope = self.class.mailer_name.gsub('/', '.')
    I18n.t(:subject, options.merge(:scope => [mailer_scope, action_name], :default => action_name.humanize))
  ensure
    reset_locale
  end  

  def set_locale(locale)
    @mail_locale = locale
  end

  protected

  def mail_locale
    @mail_locale || I18n.locale
  end

  def reset_locale
    I18n.locale = I18n.default_locale
  end

end

You just need to set the locale before you call the mail() method:

set_locale @user.locale

You can use the i18n_subject method which scope the current path so everything is structured:

mail(:subject => i18n_subject(:name => @user.name)