Redirect from old domain to new one (SEO friendly)

Question

I changed the custom domain on my Heroku app to a new one. Now I will create a new Heroku app which only purpose will be to redirect to the first app.

I read in Google

Answer 1

Put this in a before filter in the ApplicationControlller:

class ApplicationController
  before_action :redirect_if_old

  protected

  def redirect_if_old
    if request.host == 'old.com'
      redirect_to "#{request.protocol}new.com#{request.fullpath}", :status => :moved_permanently 
    end
  end
end