Question

我的帖子模型中有这个范围

scope :tynewydd_posts, :include => :department, :conditions => {"departments.name" => "Ty Newydd"}

我想按照创建的顺序对返回的结果进行排序，因此最新的帖子

我试过

scope :tynewydd_posts, :include => :department, :conditions => {"departments.name" => "Ty Newydd"}.order("posts.created_at DESC")

但我得到未定义的方法顺序：哈希，所以我想我不能在这里使用这个方法？

Answer 1

尝试这种方式：

scope :tynewydd_posts, 
      :include => :department, 
      :conditions => {"departments.name" => "Ty Newydd"}, 
      :order => "posts.created_at DESC"

Answer 2

order是传递给范围的可能选项，如下所示：

scope :tynewydd_posts, :include => :department, :conditions => {"departments.name" => "Ty Newydd"}, :order => "posts.created_at DESC"

甚至更好，正确的Rails 3语法如：

scope :tynewrdd_posts, includes(:department).where('departments.name' => 'Ty Newydd').order('posts.created_at DESC')

订购范围DESC的结果

2 个答案: