ActiveRecord表别名

Question

有谁知道是否有可能为ActiveRecord表连接设置别名？

喜欢的东西：

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

任何想法？

Answer 1

是的，但是如果覆盖连接，则需要包含'ON'语句和连接语句。

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

或Rails的3+

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