摘要：
https://github.com/peleteiro/progressbargem install progressbargem 'progressbar', '~> 0.21.0'% irb --simple-prompt -r progressbar>> pbar = ProgressBar... 阅读全文
摘要：
join(string, ...) Returns a new string formed by joining the strings using File::SEPARATOR.File.join("usr", "mail", "gumby") #=> "usr/mail/gumby"rea... 阅读全文
摘要：
http://mongoid.org/en/mongoid/docs/querying.html#querieshttp://docs.mongodb.org/manual/reference/operator/query-comparison/gt大于, gte大于等于,lt小于, lte小于等于... 阅读全文