迭代数组中的散列、散列中的散列、散列中的散列？

Question

我有一个物体，eplist，看起来像这样.

{'show' => {'name' => 'stella', 'total_seasons' => '1','episodelist' => {'season' => {'episode' => [{'epnum' => '1', 'seasonnum' => '01', 'prodnum' => '101', 'airdate' => '2005-06-28', 'title' => 'pilot'},{'epnum' => '2', 'seasonnum' => '02', 'prodnum' => '103', 'airdate' => '2005-07-05', 'title' => 'campaign'}]}}}}

代表电视导游。我的愿望是迭代它，并吐出一个字符串，就像第一季，第7集:每一集的标题。

我的麻烦来自于反复的循环。我只是无法写出一组工作正常的循环！我试过了

eplist['show']['episodelist'].each do |season|
    season.each do |episode|
        puts episode['title']
    end
end

但这只是输出空行-没有错误或任何东西。尝试执行第三个.each循环，在这个循环中，它会输出它所看到的任何元素，其中每个元素都是“季节”的“undefined method”：String`‘error。

在这种情况下，我应该如何迭代这个对象？

Answer 1

从您的数据结构中，尝试：

因为这是个哈希，

eplist['show']['episodelist']['season']['episode'].each do |data|
  puts data['title']
  # you can use the below code to get the preferred format
  # puts "Season #{data['seasonnum']}, Episode #{data['epnum']}: #{data['title']}"
end

Answer 2

如果您想保持语法不变，则

eplist['show']['episodelist'].each do |season,episodes|
  episodes['episode'].each do | episode|
    puts episode['title']
  end
end

似乎是一种奇怪的散列结构，但可能更有意义，因为

{'show' => 
  {'name' => 'stella', 'total_seasons' => '1','seasons' => [
    {'season_number' => 1,'episodes' => [
       {'epnum' => '1', 'seasonnum' => '01', 'prodnum' => '101', 'airdate' => '2005-06-28', 'title' => 'pilot'},
       {'epnum' => '2', 'seasonnum' => '02', 'prodnum' => '103', 'airdate' => '2005-07-05', 'title' => 'campaign'}]
    }]
  }
}

这样读起来会更好

 eplist.each do |show,details|
    details['seasons'].each do |season|
       season['episodes'].each do |episode|
         puts episode['title']
       end 
    end
 end