Rails Active Support 核心扩展你用过几个？

1、load Active Support

require 'active_support/core_ext/object/blank' //包含某一个方法定义的ruby文件

require 'active_support/core_ext/object‘ //包含某一类方法


require 'active_support/core_ext' //包含所有核心扩展


require 'active_support/all' //包含所有active support


2、methods

1. blank?
2. present?
3. presence
4. duplicable?
5. deep_dup
6. try
7. class_eval(*args,&block)
8. acts_lick?(duck)
9. to_param
10. to_query
11. with_options
12. instance_values
13. in?
14. praent
15. parent_name
16. parents
17. reachable?