ruby-on-rails - 带有祖先的红宝石地图

Question

我正在关注这个关于使用祖先的 railscast 剧集： http ://railscasts.com/episodes/262-trees-with-ancestry

我不了解地图方法。有人可以解释“sub_messages”是如何工作的吗？

def nested_messages(messages)
  messages.map do |message, **sub_messages**|
    render(message) + content_tag(:div, nested_messages(sub_messages), :class => "nested_messages")
  end.join.html_safe
end

Answer 1

When you call map on a hash, it iterates through the hash and (in your example), assigns the key to message and the value to sub_messages.