Ruby訪問深度哈希

Question

因此作爲我的previous question的擴展。我發現了這個問題。返回的值是的一個散列，但它是一個非常深的散列。因此，這裏的什麼方法打印：所以基本上這是

{"kind"=>"Listing", "data"=>{"modhash"=>"5g8l2yr5ld67bcab9972a4fbf072381e422fea31c6ebf45cb5", "children"=>[{"kind"=>"t3", "data"=>{"domain"=>"i.imgur.com", "banned_by"=>nil, "media_embed"=>{}, "subreddit"=>"pics", "selftext_html"=>nil, "selftext"=>"", "likes"=>nil, "link_flair_text"=>nil, "id"=>"1dtlho", "clicked"=>false, "title"=>"It almost looks like they're holding up a photograph", "media"=>nil, "score"=>3866, "approved_by"=>nil, "over_18"=>false, "hidden"=>false, "thumbnail"=>" http://f.thumbs.redditmedia.com/m2l6DYE1-gSVgpFk.jpg ", "subreddit_id"=>"t5_2qh0u", "edited"=>false, "link_flair_css_class"=>nil, "author_flair_css_class"=>nil, "downs"=>10684, "saved"=>false, "is_self"=>false, "permalink"=>"/r/pics/comments/1dtlho/it_almost_looks_like_theyre_holding_up_a/", "name"=>"t3_1dtlho", "created"=>1367907910.0, "url"=>" http://i.imgur.com/M9BVP7W.jpg ", "author_flair_text"=>nil, "author"=>"kosen13", "created_utc"=>1367879110.0, "ups"=>14550, "num_comments"=>308, "num_reports"=>nil, "distinguished"=>nil}},

我怎麼嘗試訪問它：

@reddit.get_listing().fetch('data',{}).fetch('children',{}).each do |child| 
    puts child['data'] 
end 

使打印：

{"domain"=>"i.imgur.com", "banned_by"=>nil, "media_embed"=>{}, "subreddit"=>"pics", "selftext_html"=>nil, "selftext"=>"", "likes"=>nil, "link_flair_text"=>nil, "id"=>"1dtlho", "clicked"=>false, "title"=>"It almost looks like they're holding up a photograph", "media"=>nil, "score"=>3866, "approved_by"=>nil, "over_18"=>false, "hidden"=>false, "thumbnail"=>" http://f.thumbs.redditmedia.com/m2l6DYE1-gSVgpFk.jpg ", "subreddit_id"=>"t5_2qh0u", "edited"=>false, "link_flair_css_class"=>nil, "author_flair_css_class"=>nil, "downs"=>10684, "saved"=>false, "is_self"=>false, "permalink"=>"/r/pics/comments/1dtlho/it_almost_looks_like_theyre_holding_up_a/", "name"=>"t3_1dtlho", "created"=>1367907910.0, "url"=>" http://i.imgur.com/M9BVP7W.jpg ", "author_flair_text"=>nil, "author"=>"kosen13", "created_utc"=>1367879110.0, "ups"=>14550, "num_comments"=>308, "num_reports"=>nil, "distinguished"=>nil}},

但現在我需要訪問域名和打印標題，所以我嘗試這樣的事情：

@reddit.get_listing().fetch('data',{}).fetch('children',{}).fetch('data', {}).each do |child| 
    puts child['title'] 
end 

但我得到這個錯誤： :in 'fetch': can't convert String into Integer

任何想法如何獲得散列的最後部分？

Answer 1

您不能在陣列上使用fetch。試試這個：

@reddit.get_listing().fetch('data',{}).fetch('children',{}).each do |child| 
    puts child['data']['title'] 
end