i have acts_as_tree installed as plugin under rails 2.0.2 and also its defined in class TreeItems, but when i put this in my view
<ul class="tree_level1" id="cars">Furniture <% TreeItem.root.category.children do |cat_children| %> <li><a class="list_item" href="#"><%=h cat_children.name %></a></
<% end %> </ul>
it gives me this:
undefined method `acts_as_tree' for #<Class:0x2bb3f30>