Article.create :title => "test"
Article.unscoped #=> 1 record
Article.create :title => "test"
Article.unscoped #=> still 1 record
看最下面的评论 http://apidock.com/rails/ActiveRecord/Base/unscoped/class
如果不用 unscoped 的 block 写法,结果会被缓存住,巨大的陷阱啊, 大家遇到过这个问题么?