acts_as_tree分类显示

  def display_categories(categories)
    ret = "<ul>"
    for category in categories
      if category.parent_id == 0
        ret += "<li>"
        ret += link_to category.name
        ret += find_all_subcategories(category)
        ret += "</li>"
      end
    end
    ret += "</ul>"
  end

  def find_all_subcategories(category)
    if category.children.size > 0
      ret = '<ul>'
      category.children.each { |subcat|
        if subcat.children.size > 0
          ret += '<li>'
          ret += link_to h(subcat.name), :action => 'edit', :id => subcat
          ret += find_all_subcategories(subcat)
          ret += '</li>'
        else
          ret += '<li>'
          ret += link_to h(subcat.name), :action => 'edit', :id => subcat
          ret += '</li>'
        end
      }
      ret += '</ul>'
    end
  end

 

具体示例：

 

<%= display_categories(@categories) %>