Ruby Parsing Hash

Question

So I'm using a gem file to pull links from the front page of reddit. The gem function returns a hash containing ALL the links on the front page and all their info (# of comments, karma, author, date, link, ups, downs, etc). Below is a begging of the hash containg the information for the FIRST link on my front page:

{"modhash"=>"ubekfji9tr491ba98806d33ec78693dc157579335eb1ab283b", "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"=>"1dt29e", "clicked"=>false, "title"=>"Our plumber in Italy put himself out there to ask us for help on his English homework :) Hope he passes his finals!", "media"=>nil, "score"=>3700, "approved_by"=>nil, "over_18"=>false, "hidden"=>false, "thumbnail"=>"http://b.thumbs.redditmedia.com/Fdid4luCfXah0bQ7.jpg", "subreddit_id"=>"t5_2qh0u", "edited"=>false, "link_flair_css_class"=>nil, "author_flair_css_class"=>nil, "downs"=>17890, "saved"=>false, "is_self"=>false, "permalink"=>"/r/pics/comments/1dt29e/our_plumber_in_italy_put_himself_out_there_to_ask/", "name"=>"t3_1dt29e", "created"=>1367893951.0, "url"=>"https://i.sstatic.net/DWZRf.jpg", "author_flair_text"=>nil, "author"=>"Junpha", "created_utc"=>1367865151.0, "distinguished"=>nil, "num_comments"=>553, "num_reports"=>nil, "ups"=>21590}},

That ending , seperates the next link which looks like this:

{"kind"=>"t3", "data"=>{"domain"=>"i.imgur.com", "banned_by"=>nil, "media_embed"=>{}, "subreddit"=>"funny", "selftext_html"=>nil, "selftext"=>"", "likes"=>nil, "link_flair_text"=>nil, "id"=>"1dt4xv", "clicked"=>false, "title"=>"What a beautiful, majestic.... oops", "media"=>nil, "score"=>2848, "approved_by"=>nil, "over_18"=>false, "hidden"=>false, "thumbnail"=>"http://a.thumbs.redditmedia.com/vkstE1PFr9iyYpux.jpg", "subreddit_id"=>"t5_2qh33", "edited"=>false, "link_flair_css_class"=>nil, "author_flair_css_class"=>nil, "downs"=>8128, "saved"=>false, "is_self"=>false, "permalink"=>"/r/funny/comments/1dt4xv/what_a_beautiful_majestic_oops/", "name"=>"t3_1dt4xv", "created"=>1367895955.0, "url"=>"https://i.sstatic.net/jzIqQ.gif", "author_flair_text"=>nil, "author"=>"themisc", "created_utc"=>1367867155.0, "distinguished"=>nil, "num_comments"=>279, "num_reports"=>nil, "ups"=>10976}},

I basically need someway to parse each entry of this hash so that I can store all the relevant stuff into an array. Really, I just want to store the "title" and "url" parts into an array. I tried something like this:

@red.get_listing().each do |x['title']|
    puts x
end

But i realized this is a hash of a hash..so I'm kinda lost as to how to parse this.

If it's a hash, why would you need to parse it? You access inner haves the same way as outer hashes. — Dave Newton
– Dave Newton, Commented May 6, 2013 at 23:44

Logan Serman · Accepted Answer · 2013-05-06 23:48:54Z

2

hash[:children].each do |child|
  puts child[:title]
  puts child[:url]
end

Does that help?

answered May 6, 2013 at 23:48

Logan Serman

30k28 gold badges107 silver badges144 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Richard Over a year ago

kind of...the problem now is that the returned value from the method isn't an actual hash so you can do something like @red.get_listing()[:children].each because it says undefined method 'each'. Need a way to convert to hash now

corroded Over a year ago

that's probably because get_listing is not returning a hash or if it does, it needs to have indifferent access. looking at your original hash, your hash keys are strings, so you access them using strings (if they don't have indifferent access)

Suraj Rao · Accepted Answer · 2022-09-07 13:48:50Z

hash = {"modhash"=>"ubekfji9tr491ba98806d33ec78693dc157579335eb1ab283b", 
"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"=>"1dt29e", "clicked"=>false, "title"=>"Our plumber in Italy put himself out there to ask us for help on his English homework :) Hope he passes his finals!", "media"=>nil, "score"=>3700, "approved_by"=>nil, "over_18"=>false, "hidden"=>false, "thumbnail"=>"http://b.thumbs.redditmedia.com/Fdid4luCfXah0bQ7.jpg", "subreddit_id"=>"t5_2qh0u", "edited"=>false, "link_flair_css_class"=>nil, "author_flair_css_class"=>nil, "downs"=>17890, "saved"=>false, "is_self"=>false, "permalink"=>"/r/pics/comments/1dt29e/our_plumber_in_italy_put_himself_out_there_to_ask/", "name"=>"t3_1dt29e", "created"=>1367893951.0, "url"=>"http://i.imgur.com/3xn1c8s.jpg", "author_flair_text"=>nil, "author"=>"Junpha", "created_utc"=>1367865151.0, "distinguished"=>nil, "num_comments"=>553, "num_reports"=>nil, "ups"=>21590}},{"kind"=>"t3", "data"=>{"domain"=>"i.imgur.com", "banned_by"=>nil, "media_embed"=>{}, "subreddit"=>"funny", "selftext_html"=>nil, "selftext"=>"", "likes"=>nil, "link_flair_text"=>nil, "id"=>"1dt4xv", "clicked"=>false, "title"=>"What a beautiful, majestic.... oops", "media"=>nil, "score"=>2848, "approved_by"=>nil, "over_18"=>false, "hidden"=>false, "thumbnail"=>"http://a.thumbs.redditmedia.com/vkstE1PFr9iyYpux.jpg", "subreddit_id"=>"t5_2qh33", "edited"=>false, "link_flair_css_class"=>nil, "author_flair_css_class"=>nil, "downs"=>8128, "saved"=>false, "is_self"=>false, "permalink"=>"/r/funny/comments/1dt4xv/what_a_beautiful_majestic_oops/", "name"=>"t3_1dt4xv", "created"=>1367895955.0, "url"=>"http://i.imgur.com/62q1jWN.gif", "author_flair_text"=>nil, "author"=>"themisc", "created_utc"=>1367867155.0, "distinguished"=>nil, "num_comments"=>279, "num_reports"=>nil, "ups"=>10976}}
]}


hash['children'].map { |child| child['data']['url'] }
hash['children'].map { |child| child['data']['title'] }

or if you want to use symbols (and are in rails)

hash.with_indifferent_access[:children].first[:data][:title]

sh03 · Accepted Answer · 2013-05-06 23:57:54Z

0

You don't really need to parse them, just access its value:

hash[:data][:title]
hash[:data][:url]

answered May 6, 2013 at 23:57

sh03

76.5k39 gold badges177 silver badges282 bronze badges

Collectives™ on Stack Overflow

Ruby Parsing Hash

3 Answers 3

2 Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

2 Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related