ben7th/vote — comment on commit d72112038d29b32bc6a4fe85537aae049c9162a3
File: app/models/vote.rb line 23
By ben7th:

一般模型上定义的用来做逻辑判断的方法名，后面都带一个问号，例如这个

is_signle?

这也是rails社区的习惯