ActiveRecordで多階層カテゴリ(Ancestry) - Qiita
ActiveRecordで多階層カテゴリ という投稿をしたところ、 @jnchito さんに Ancestry なるgemを教えていただきました。 stefankroes/ancestry Organise ActiveRecord model into a tree structure 準備 $ rails g model category name:string $ rake db:migrate mysql> desc categories; +------------+--------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +------------+--------------+------+-----+---------+---
Models for hierarchical data
Tree-like data relationships are common, but working with trees in SQL usually requires awkward recursive queries. This talk describes alternative solutions in SQL, including: - Adjacency List - Path Enumeration - Nested Sets - Closure Table Code examples will show using these designs in PHP, and offer guidelines for choosing one design over another.Read less
GitHub - stefankroes/ancestry: Organise ActiveRecord model into a tree structure
Ancestry Overview Ancestry is a gem that allows rails ActiveRecord models to be organized as a tree structure (or hierarchy). It employs the materialized path pattern which allows operations to be performed efficiently. Features There are a few common ways of storing hierarchical data in a database: materialized path, closure tree table, adjacency lists, nested sets, and adjacency list with recurs
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