application_controller.rb

  def generic_render(path, flash_hash = {})
    flash_hash.each do |k, v|
      flash.now[k] = v
    end

    if xhr?
      @modal_path = path
      render 'shared/modal_replace'
    else
      render path
    end
  end

  def generic_redirect(path, flash_hash = {})
    flash_hash.each do |k, v|
      flash[k] = v
    end

    if xhr?
      @redirect_path = path
      render 'shared/redirect'
    else
      redirect_to path
    end
  end