Force Rails Heroku App from subdomain.herokuapp.com to apex domain?

Question

What is the proper way to send a subdomain.herokuapp.com to the apex domain of the application? This is to avoid multiple domain names with the same content.

Answer 1

For a comprehensive answer with some bit of extensibility, in totality it looks something like this;

class ApplicationController < ActionController::Base

  before_filter :redirect_to_example if Rails.env.production?

  # Prevent CSRF attacks by raising an exception.
  # For APIs, you may want to use :null_session instead.
  protect_from_forgery with: :exception

  private

    # Redirect to the appropriate domain i.e. example.com
    def redirect_to_example
      domain_to_redirect_to = 'example.com'
      domain_exceptions = ['example.com', 'www.example.com']
      should_redirect = !(domain_exceptions.include? request.host)
      new_url = "#{request.protocol}#{domain_to_redirect_to}#{request.fullpath}"
      redirect_to new_url, status: :moved_permanently if should_redirect
    end
end

This will redirect everything to domain_to_redirect_to except what's in domain_exceptions.