递归生成树

class Product < ActiveRecord::Base
  acts_as_tree :order => "name"

  def self.roots 
    self.find(:all,:conditions => ["parent_id=?",0]) 
  end
  
  def is_leaf? 
    return !self.has_children?   
  end 
  
  def is_root? 
    return self.parent_id == 0 
  end 
end

 

module ProductsHelper
  def get_tree(trees) 
    tree_html = ""; 
    trees.each do |tree| 
      #if tree.is_root?
        tree_html += "<li><span><img src='../images/folder.gif' />#{tree.name}&nbsp;&nbsp;&nbsp;&nbsp;#{link_to('修改',edit_admin_product_path(tree.id))}</span>"
      #end

      if !tree.children.empty? then
        tree_html += "<ul>" + get_tree(tree.children) + "</ul>"
      end
      tree_html += "</li>"
    end 
    return tree_html 
  end 
end

 

 

view中调用:

 

<ul id="browser" class="filetree">
<%= get_tree(@products)%>
</ul>