Comparing ancestry and closure_tree for your nested data structure · hilman.io
Comparing ancestry and closure_tree for your nested data structure Sun, Sep 13, 2015 When it comes to implementing ActiveRecord nesting, there are a few popular implementations. In this post I will look closer at how Ancestry and Closure tree work and what the pros and cons are. How ancestry works Ancestry works by adding one column (by default named “ancestry”) that replaces the parent_id. Instea
Rails の awesome_nested_set がひどい - tmtms のメモ
Rails がデータベース層でやってること見るとイライラして精神衛生上良くないから気にしないことにするか。でも気になる。 2012-06-06 19:15:40 via TweetDeck ということでやっぱり気になって色々見てしまう自分です。 Rails の ActiveRecord でツリー構造を表現するのには awesome_nested_set というプラグインがいいらしいというので使ってみました。 awesome_nested_set を使って acts_as_nested_set を指定したモデルにデータを登録すると、次のようなクエリが実行されるようです。 BEGIN; SELECT `sections`.* FROM `sections` ORDER BY `rgt` desc LIMIT 1 FOR UPDATE; INSERT INTO `sections` (`crea
Building a Binary Tree with Enumerable
2014-11-26 I believe that the Enumerable module is the most important thing to understand if you want to go from a beginner to intermediate Rubyist. It requires you to understand two fundamental parts of Ruby: modules and blocks. Ruby’s standard library includes hashes, arrays, sets and thread-safe queues. One structure missing is a generic binary tree. Binary trees are great general purpose data
Ruby's Exception Hierarchy
Posted by Nick Sieger Wed, 06 Sep 2006 20:16:00 GMT Tim Bray: Today I needed to know the class hierarchy under Exception, and maybe it’s there online but I couldn’t find it. Blecch. Hint: Pickaxe, 2nd ed., page 462. Well, you could always use Ruby itself, too, that way you’ll always have an up-to-date list: exceptions = [] tree = {} ObjectSpace.each_object(Class) do |cls| next unless cls.ancestors
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fix validation on parent for Rails 5 by pacMakaveli · Pull Request #196 · ClosureTree/closure_tree
Awesome nested set cheat sheet
はてな
GitHub - take-five/acts_as_ordered_tree: ActiveRecord extension for ordered adjacency trees support
Recursive data structures with Rails
GitHub - StewEucen/fertile-forest-railsgem: Fertile Forest Model for storing hierarchical data in database on RailsGem.
ActiveRecordで多階層カテゴリ(Ancestry) - Qiita
GitHub - stefankroes/ancestry: Organise ActiveRecord model into a tree structure
GitHub - ClosureTree/closure_tree: Easily and efficiently make your ActiveRecord models support hierarchies
GitHub - collectiveidea/awesome_nested_set: An awesome replacement for acts_as_nested_set and better_nested_set.