merge_prefix_into_object_path

# File actionpack/lib/action_view/renderer/partial_renderer.rb, line 392
    def merge_prefix_into_object_path(prefix, object_path)
      if prefix.include?(//) && object_path.include?(//)
        prefixes = []
        prefix_array = File.dirname(prefix).split('/')
        object_path_array = object_path.split('/')[0..-3] # skip model dir & partial

        prefix_array.each_with_index do |dir, index|
          break if dir == object_path_array[index]
          prefixes << dir
        end

        (prefixes << object_path).join("/")
      else
        object_path
      end
    end