```ruby
module RailsAdminNestable
  module Helper
    def nested_tree_nodes(tree_nodes = [])
      tree_nodes.map do |tree_node, sub_tree_nodes|
        li_classes = 'dd-item dd3-item'

        content_tag :li, class: li_classes, :'data-id' => tree_node.id do

          output = content_tag :div, 'drag', class: 'dd-handle dd3-handle'
          output += content_tag :div, class: 'dd3-content' do
            content = link_to @model_config.with(object: tree_node).object_label, edit_path(@abstract_model, tree_node.id)
            content += content_tag :div, action_links(tree_node), class: 'pull-right links'
          end

          output+= content_tag :ol, nested_tree_nodes(sub_tree_nodes), class: 'dd-list' if sub_tree_nodes && sub_tree_nodes.any?
          output
        end
      end.join.html_safe
    end

    def action_links(model)
      content_tag :ul, class: 'inline actions' do
        menu_for :member, @abstract_model, model, true
      end
    end

    def tree_max_depth
      @nestable_conf.options[:max_depth] || 'false'
    end
  end
end```

Update class to work with Bootstrap 3 (which RA now uses)
user
```ruby
module RailsAdminNestable
  module Helper
    def nested_tree_nodes(tree_nodes = [])
      tree_nodes.map do |tree_node, sub_tree_nodes|
        li_classes = 'dd-item dd3-item'

        content_tag :li, class: li_classes, :'data-id' => tree_node.id do

          output = content_tag :div, 'drag', class: 'dd-handle dd3-handle'
          output += content_tag :div, class: 'dd3-content' do
            content = link_to @model_config.with(object: tree_node).object_label, edit_path(@abstract_model, tree_node.id)
            content += content_tag :div, action_links(tree_node), class: 'pull-right links'
          end

          output+= content_tag :ol, nested_tree_nodes(sub_tree_nodes), class: 'dd-list' if sub_tree_nodes && sub_tree_nodes.any?
          output
        end
      end.join.html_safe
    end

    def action_links(model)
      content_tag :ul, class: 'inline list-inline' do
        menu_for :member, @abstract_model, model, true
      end
    end

    def tree_max_depth
      @nestable_conf.options[:max_depth] || 'false'
    end
  end
end
```
assistant