将SQL语句转换为named_scope？

Question

如何将此SQL转换为named_scope？此外，我希望总评论参数通过lambda传递。

“选择用户。，计数（），如从用户TOTAL_COMMENTS，评论，其中（users.id = comments.user_id）和（comments.public_comment = 1）和（comments.aasm_state = '发布'）和（ comments.forum_user_id为空）group by users.id having total_comments> 25“

Answer 1

named_scope :comments_count_gt, lambda { |count| 
    { :select => "users., count() as total_comments", 
    :joins => :comments, 
    :conditions => { :comments => { :public_comment => 1, :aasm_state => 'posted' } }, 
    :group => "users.id", 
    :having => "total_comments > #{count.to_i}" 
    } 
}