我正在使用 thetvdb.com API 来获取节目的剧集列表。通常，XML 格式类似于：
<Data>
<Series>...</Series>
<Episode><EpisodeName>Foo</EpisodeName><EpisodeNumber>1</EpisodeNumber></Episode>
<Episode><EpisodeName>Bar</EpisodeName><EpisodeNumber>2</EpisodeNumber></Episode>
</Data>
我所做的是使用解析 XMLHash.from_xml然后处理数据。要遍历剧集，我会执行以下操作：
hash_data['Data']['Episode'].each do ...
如果有多个剧集，这很有效。但是，如果只有一集，则该each方法实际上会遍历该特定集的哈希条目，而不是只运行该each方法一次。这打破了我所有的代码。
我试过：
hash_data['Data']['Episode'].to_a.each do ...
结果相同。必须有一个“正确”的方法来做到这一点？
更新：我认为这个问题很清楚，但似乎人们对此感到困惑。澄清一下，我真的只是想遍历剧集并查看内容。数据最初是作为 XML 接收的，所以为了在 Ruby 中检查它，我使用Hash.from_xml(xml_response).
就“预期行为”而言，举个例子：
hash_data['Data']['Episode'].each do |e| { puts e['EpisodeNumber'] }
鉴于此初始数据，我希望：
<Data>
<Series>...</Series>
<Episode><EpisodeName>Foo</EpisodeName><EpisodeNumber>1</EpisodeNumber></Episode>
<Episode><EpisodeName>Bar</EpisodeName><EpisodeNumber>2</EpisodeNumber></Episode>
</Data>
输出将是：
1
2
这样可行。但是，如果我收到这样的输入：
<Data>
<Series>...</Series>
<Episode><EpisodeName>Foo</EpisodeName><EpisodeNumber>1</EpisodeNumber></Episode>
</Data>
我崩溃了，因为e['EpisodeNumber']它无效。它是无效的，因为在只有一个情节的情况下，each实际上迭代哈希的每个键（所以进入each块的第一个值是情节名称的键值对），而不是像以前那样是一个哈希数组元素不止一种。
换句话说，当有多个情节时，hash_data['Data']['Episode']是一种Array类型Hash。当只有一集时，它只是一个Hash。如果有一个情节时，我的代码仍然是一个Array，但其中只有一个项目，我的代码将正常工作。但事实并非如此。我该如何正确处理这个问题？
我希望这能解决吗？
更新 2：有人要求我发布Hash#inspect返回的数据。这是一个只有一集的节目：
{"Data"=>{"Series"=>{"id"=>"263752", "Actors"=>"||", "Airs_DayOfWeek"=>"Thursday", "Airs_Time"=>"10pm", "ContentRating"=>nil, "FirstAired"=>"2013-01-17", "Genre"=>"|Game Show|Reality|", "IMDB_ID"=>"tt2401129", "Language"=>"en", "Network"=>"TBS Superstation", "NetworkID"=>nil, "Overview"=>"Hosted by Robert Carradine and Curtis Armstrong, King of the Nerds is the ultimate nerd-off. The series will follow eleven fierce competitors from across the nerd spectrum as they set out to win $100,000 and be crowned the greatest nerd of them all.\n\nKing of the Nerds will take the glory of geekdom to a whole new level as the eleven competitors live together in \"Nerdvana.\" Each week, they must face challenges that will test their intellect, ingenuity, skills and pop culture prowess. In each episode, the nerds will first compete as teams and then as individuals, facing challenges that range from live gaming to a dance-off to life-sized chess. One competitor will be eliminated each week until one nerd stands alone as the ultimate champion off all things nerdy.", "Rating"=>nil, "RatingCount"=>"0", "Runtime"=>"60", "SeriesID"=>nil, "SeriesName"=>"King of the Nerds", "Status"=>"Continuing", "added"=>"2012-10-31 21:53:29", "addedBy"=>"348252", "banner"=>"graphical/263752-g2.jpg", "fanart"=>"fanart/original/263752-1.jpg", "lastupdated"=>"1357501598", "poster"=>nil, "zap2it_id"=>nil}, "Episode"=>{"id"=>"4428487", "Combined_episodenumber"=>"1", "Combined_season"=>"1", "DVD_chapter"=>nil, "DVD_discid"=>nil, "DVD_episodenumber"=>nil, "DVD_season"=>nil, "Director"=>nil, "EpImgFlag"=>nil, "EpisodeName"=>"Welcome to the Nerdvana", "EpisodeNumber"=>"1", "FirstAired"=>"2013-01-17", "GuestStars"=>nil, "IMDB_ID"=>nil, "Language"=>"en", "Overview"=>nil, "ProductionCode"=>nil, "Rating"=>nil, "RatingCount"=>"0", "SeasonNumber"=>"1", "Writer"=>nil, "absolute_number"=>nil, "filename"=>nil, "lastupdated"=>"1357501766", "seasonid"=>"504427", "seriesid"=>"263752"}}}
请注意，这Episode是一个Hash类型。
这是一个不止一集的节目：
{"Data"=>{"Series"=>{"id"=>"220441", "Actors"=>"||", "Airs_DayOfWeek"=>"Saturday", "Airs_Time"=>"8:30PM", "ContentRating"=>"TV-PG", "FirstAired"=>"2010-12-25", "Genre"=>"|Children|Drama|", "IMDB_ID"=>"tt1765510", "Language"=>"en", "Network"=>"The Hub", "NetworkID"=>nil, "Overview"=>nil, "Rating"=>"7.0", "RatingCount"=>"1", "Runtime"=>"30", "SeriesID"=>nil, "SeriesName"=>"R L Stine's The Haunting Hour", "Status"=>"Continuing", "added"=>"2011-01-10 15:59:43", "addedBy"=>"66501", "banner"=>"graphical/220441-g.jpg", "fanart"=>"fanart/original/220441-1.jpg", "lastupdated"=>"1354439519", "poster"=>"posters/220441-1.jpg", "zap2it_id"=>nil}, "Episode"=>[{"id"=>"3453441", "Combined_episodenumber"=>"1", "Combined_season"=>"1", "DVD_chapter"=>nil, "DVD_discid"=>nil, "DVD_episodenumber"=>nil, "DVD_season"=>nil, "Director"=>nil, "EpImgFlag"=>"2", "EpisodeName"=>"Really You (Part 1)", "EpisodeNumber"=>"1", "FirstAired"=>"2010-10-29", "GuestStars"=>"|Bailee Madison|Connor Price|", "IMDB_ID"=>nil, "Language"=>"en", "Overview"=>"A girl named Lilly (Bailee Madison) is given her very own life-sized \"Really You\" doll which is named Lilly D.; because she is good at manipulating her dad. Lilly remains a spoiled brat, bragging about Lilly D, even going as far as ripping the leg off a friends doll, after the friend informs Lilly that \"Lilly D hates Lilly\". Soon after, strange events begin to occur which Lilly's mother accuses Lilly of doing; despite how Lilly maintains she is innocent, and that Lilly D is alive.", "ProductionCode"=>nil, "Rating"=>"8.0", "RatingCount"=>"1", "SeasonNumber"=>"1", "Writer"=>nil, "absolute_number"=>nil, "filename"=>"episodes/220441/3453441.jpg", "lastupdated"=>"1350772755", "seasonid"=>"393441", "seriesid"=>"220441"}, ...
通知Episode现在是一种Array类型Hash。