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PENGZhaoqing / CourseSelect

校园选课系统样本 (a template for course selection system by Ruby on Rails)
https://courseselect.herokuapp.com/
MIT License
105 stars 205 forks source link

Work #83

Closed qqgwq closed 7 years ago

qqgwq commented 7 years ago

添加页面的分页，把length换成count 因为count不会加载所有对象，减少查询时间

PENGZhaoqing commented 7 years ago

count会触发数据库操作, length是执行完数据库操作后的ruby指令, 前面where已经查询一波了, 所以这里用length啊

https://stackoverflow.com/questions/6083219/activerecord-size-vs-count