3

我有以下查找帖子。

@posts = Post.find(:all, 
:select => "DISTINCT *",
:include => [:user, {:track => :artist}],
:conditions => ["user_id IN (?) AND NOT track_id = ?", users, @track.id],
:group => "track_id", 
:order => 'id desc', 
:limit => '5')

我想添加子选择

(SELECT COUNT(*) FROM posts P2 
    WHERE P2.user_id = P1.user_id AND P2.id > P1.id AND P2.track_id <> 34)
 <= 1

在我的条件条款中，限制每个用户的帖子数量。

如何将别名 P1 设置为“初始”帖子表？

使用导轨 2.3.11

4

1 回答 1

6

您可以添加一个from参数：

:from => 'posts P1',

查找 (ActiveRecord::Base)

于 2011-10-02T16:25:17.717 回答