ruby-on-rails – ActiveRecord表别名

有谁知道是否有可能为ActiveRecord表连接设置别名？

就像是：

User.find(:all,:alias => "Users as u",:joins => "Friends as f",:select => "u.id,f.name")

有任何想法吗？

解决方法

是的,但如果覆盖连接,则需要包含“ON”语句和join语句.

User.find(:all,:joins => " as u INNER JOIN Friends as f ON f.user_id = u.id",f.name")

或者在Rails 3中

User.joins("as u INNER JOIN Friends as f on f.user_id = u.id")
    .select("u.id,f.name")
    .all