Override Rails' #render helper to fix an issue with rendering partials based on an object within a namespace.

rendering_helper.rb

module RenderingHelper
  # Override Rails' #render helper to fix an issue with it not honoring objects
  # with #to_partial_path definitions that return absolute paths, which is
  # problematic when rendering partials within a namespaced controller.
  def render(options={}, locals={}, &block)
    return super unless options.respond_to?(:to_partial_path)
  
    object = options
    path = object.to_partial_path

    if path.start_with?('/')
      options = { partial: path, object: object, locals: locals }
      view_renderer.render_partial(self, options)
    else
      super
    end
  end
end