render respecting subdomains.

application_helper.rb

 module ApplicationHelper
  
  def render_respecting_subdomain(options = nil, extra_options = {}, &block)
    raw render(sanitized_options_from(options, request.subdomain), extra_options, &block)
  rescue ActionView::MissingTemplate
    raw render(sanitized_options_from(options, "default"), extra_options, &block)
  end
 
  def sanitized_options_from(args, subdomain = "")
    return args unless subdomain.present?
 
    if args.is_a?(String)
      "subdomains/#{subdomain}/#{args}" if subdomain.present?
    elsif args.is_a?(Hash) && args[:partial]
     args.merge({ partial: "subdomains/#{subdomain}/#{args[:partial]}" })
    end
  end
 end