ActsAsNestedSet in Ruby on Rails

A Nested Set is similar to a tree from ActsAsTree. However the nested set allows building of the entire hierarchy at once instead of querying each nodes children, and their children. When destroying an object, a before_destroy trigger prunes the rest of the branch of object under the current object. Table Schema create table nested_objects ( id int(11) unsigned not null auto_increment, parent_i

[t-wada]

NestedSetモデルへのマッピング。これが欲しかった。