ruby-on-rails - Ruby On Rails 3 问题排序查询结果

Question

我正在尝试按 created_at 日期以降序排列我的结果，但 order.clause 似乎不起作用。恐怕我已经看这个太久了，完全可以从第二组(或第三组或更多)眼睛中受益。
mailbox_controller.rb :

def show  
  current_user = User.find(session[:user_id])  
  @folder = Folder.where("user_id = #{current_user.id}").first  
  @msgs = @folder.messages.order("created_at DESC")  
  @messages = @msgs.where(["deleted IS NULL"] || ["deleted = ?", false]).paginate :per_page => 5, :page => params[:page]  
end

Answer 1

@msgs = @folder.messages.order("created_at DESC")
@messages = @msgs.where(["deleted IS NULL"] || ["deleted = ?", false])

应该

@messages = @folder.messages.order("created_at DESC").where("deleted = ? or deleted IS NULL", false)