递归生成树

代码

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

 

代码

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 >