[Ruby On Rails] 技巧小筆記

Ruby 1.8 的字串其實只是 byte 的集合，如果你需要對 UTF-8 字串做一些函式操作，
Rails 提供了 mb_chars 來包裝以獲得正確的結果，來源:http://ihower.tw/rails2/
例如: "中文".size # 6 "中文".mb_chars.size # 2

1.取得Gem full path: 
rails c
Gem.loaded_specs['rails'].full_gem_path 

2.過濾html tag in controller  
  string_with_html = '123'
  方法一: HTML::FullSanitizer.new.sanitize(string_with_html)
  方法二: include ActionView::Helpers::SanitizeHelper 
          strip_tags(string_with_html)


Use self.class class Foo def self.some_class_method puts self end def some_instance_method self.class.some_class_method end end print "Class method: " Foo.some_class_method print "Instance method: " Foo.new.some_instance_method

Show included_modules  
a.new.included_modules

Find source location
a.method(:method_name).source_location

記錄console的 sql log Link
ActiveRecord::Base.logger = Logger.new File.open('log/development.log', 'a')