The acts-as-tagged-tree plugin adds behaviour to an acts_as_taggable model which maps the model's objects to a tree as follows:

root -+
      |
      + Tag1+
      |     |
      |     + node1
      |     + node2
      + Tag2+
      |     |
      |     + node3
      + Tag3+
            |
            + node1
            + node3

Note that nodes can exist in more than one tag.

== Requirements

acts-as-tagged-tree requires the following gems/plugins: acts_as_tree acts_as_taggable_on or acts_as_taggable_on_steroids