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Trello 的开源克隆 libreboard，以及开源软件借鉴商业软件的种种 at January 24, 2015
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当 self.attr.nil? 时 self.attr ||= 和 self.attr = 的区别 at October 29, 2014
http://stackoverflow.com/a/9882795
What is the difference between 'private' and 'protected' methods in Ruby? In Ruby, the primary difference between a 'private' and 'protected' method is that a private method cannot be called with an explicit receiver, while a protected method can. What is an 'explicit receiver', you ask? An explicit receiver is the object that is receiving a message. In the following example, we have a receiver ('parent') and a method ('get_name'). The 'parent' object is receiving the instruction to perform the 'get_name' method.
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生成随机字母的精妙代码 at March 07, 2013
[*?a..?z].sample(8).join