Top "Acts-as-tree" questions

ActsAsTree extends ActiveRecord to add simple support for organizing items into parent–children relationships.

Formtastic select with grouping

Now with Formtastic I have plain select: = f.input :category, :as => :select, :include_blank => false, :collection => subcategories …

ruby-on-rails grouping formtastic acts-as-tree optgroup
Reddit-style nested/threaded/indented comments for Rails?

I'm wondering if someone has already built a system for threaded comments (for lack of a better term) in Rails …

ruby-on-rails reddit threaded-comments acts-as-tree