马凤兰 开发者_如何学C2021-04-23 04:03 可回收垃圾。 纸杯的一般性原料为：食品级木浆纸+食品级PE薄膜。
Ruby: 1.9.2 Rails: 3.0beta3 I need some help with associations in Rails 3. I have the following models (see excerpts below):
加载中,请稍侯......