1.安装:
我在github上fork了这个插件,访问地址是:http://github.com/krongk/acts_as_tree/tree/master
Give this clone URL to anyone.
git clone git://github.com/krongk/acts_as_tree.git
这样安装：
1）首先确认你电脑已经安装了Git，打开Git Bash命令窗口，cd到项目根目录下
2）运行：
git clone git://github.com/krongk/acts_as_tree.git vendor/plugins/acts_as_tree
*注：要指定复制的路径vendor/plugins/acts_as_tree
2.创建数据库迁移文件:
create_table :categories do |t|
t.integer :id
t.integer :parent_id, :default=>0
...
end
2.修改Model
class Project < ActiveRecord::Base
acts_as_tree
end
3.添加Helper方法
def display_categories(categories)
ret = "<ul>"
for category in categories
if category.parent_id == 0
ret += "<li class='top'>"
ret += link_to category.cn_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.cn_name), :action => 'show', :id => subcat
ret += find_all_subcategories(subcat)
ret += '</li>'
else
ret += '<li>'
ret += link_to h(subcat.cn_name), :action => 'show', :id => subcat
ret += '</li>'
end
}
ret += '</ul>'
end
end
4.修改View
<%= display_categories(@categories) %>
5.运行程序，效果如下：
当然还需要添加一些CSS样式了。
/*start: project menu*/
#project_menu {
margin: 0px;
padding: 4px;
}
#project_menu ul {
list-style-type: none;
margin-left:20px;
padding:0px;
}
#project_menu ul li {
font-weight: normal;
margin:0;
padding:0;
list-style-image: url("../../images/ico/minimize.png");
}
#project_menu a{
margin:0;
padding:0;
}
#project_menu ul .top {
font-weight: bold;
list-style-image: url("../../images/ico/maximize.png");
}
/*end: project menu*/
6。参考：
http://snippets.dzone.com/tag/acts_as_tree
http://github.com/krongk/acts_as_tree/tree/master
