将SQL语句转换为named_scope？

Question

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

“选择用户。，将（）计为用户的total_comments，其中的注释（users.id = comments.user_id）和（comments.public_comment = 1）和（comments.aasm_state ='已发布） '）和（comments.forum_user_id为null）由users.id分组，其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}"
  }
}