在我的Ruby on Rails应用程序中,我的数据库 struct 如下:
Project.create(:group => "1", :date => "2014-01-01")
Project.create(:group => "1", :date => "2014-01-02")
Project.create(:group => "1", :date => "2014-01-03")
Project.create(:group => "2", :date => "2014-01-01")
Project.create(:group => "2", :date => "2014-01-02")
Project.create(:group => "2", :date => "2014-01-03")
# and so forth...
如何使用ActiveRecord从每group
条中获取最新记录?
解决方案可能很简单,但我无法理解这一点.
谢谢你的帮助.