StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

PO
primarykey
Id
1987026
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2009-12-31T20:38:32.507
FavoriteCount
0
LastActivityDate
2009-12-31T21:25:55.437
LastEditDate
2009-12-31T21:25:55.437
LastEditorUserId
179125
OwnerUserId
179125
ParentId
1986815
PostTypeId
2
Score
0
ViewCount
0
LastEditorDisplayName
text
Body
<h2>This is good but not great; see below for a much-simplified method.</h2> <pre><code>def hash_to_eval_chain(hsh) make_eval_chain(hsh).join "." end private def make_eval_chain(obj) if obj.is_a? Hash raise "Hash cannot contain multiple key-value pairs unless they are nested" if obj.size > 1 return make_eval_chain(obj.to_a.flatten) elsif obj.is_a? Array return [ obj.first, *make_eval_chain(obj.last) ] if obj.last.is_a? Hash return obj if [String, Symbol, Array].include? obj.class raise "Only strings, symbols, and hashes are allowed as values in the hash." else raise "Expected Hash, received #{obj.class}" end end # Usage: # irb> hash_to_eval_chain { :one => { :two=> { :three => { :four=> :five } } } } # => "one.two.three.four.five" </code></pre> <p>I couldn't find an elegant way to roll it all into one function, so I hope two will suffice.</p> <p>Basically I realized that <code>{:one => {:two => :three}}.to_a.flatten</code> returns <code>[:one, {:two => :three}]</code> and said A-ha!, this is classic car/cdr-style recursion.</p> <h2>BETTER METHOD:</h2> <p>You know what, I was making that WAY harder than necessary. This is better (inspired by Facets' <a href="http://facets.rubyforge.org/apidoc/api/core/classes/Hash.html#M000197" rel="nofollow noreferrer">Hash#recursively</a> method):</p> <pre><code>def hash_to_eval_chain(hsh) make_eval_chain(hsh).flatten.join "." end private def make_eval_chain(obj) if obj.is_a? Hash return obj.map {|key, val| [key, *make_eval_chain(val)] } if obj.is_a?(Hash) && obj.size <= 1 raise "Hash cannot contain multiple key-value pairs unless they are nested" else return obj if [String, Symbol, Array].any? { |klass| obj.is_a? klass } raise "Only strings, symbols, and hashes are allowed as values in the Hash." end end # Usage: # irb> hash_to_eval_chain { :one => { :two=> { :three => { :four=> :five } } } } # => "one.two.three.four.five" </code></pre>
Tags
Title
singulars
PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. POImprove this recursive function for hash traversal in Ruby
  singulars
  PostTypePostTypeId
  PTQuestion
PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. USJordan Running
UserOwnerUserId
1. USJordan Running
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. This table or related slice is empty.
VotesPostIdCreationDate
1. This table or related slice is empty.
CommentsPostId
1. This table or related slice is empty.

Querying!

Guidance

A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.