ruby-on-rails-3 - 范围 DESC 的排序结果

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，所以最新的帖子优先

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：hash，所以我想我不能在这里使用这个方法？

Answer 1

试试这个方法：

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"

或者更好的是，正确的 Rails 3 语法，例如：

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