修改课程资源排序报错

app/controllers/files_controller.rb

@@ -133,9 +133,9 @@ class FilesController < ApplicationController
           end
 
           if order_by.count == 1
-            sort += "#{Attachment.table_name}.#{attribute} asc "
+            sort += "#{Attachment.table_name}.#{attribute} asc " if attribute
           elsif order_by.count == 2
-            sort += "#{Attachment.table_name}.#{attribute} #{order_by[1]} "
+            sort += "#{Attachment.table_name}.#{attribute} #{order_by[1]} " if attribute && order_by[1]
           end
           if sort_type != params[:sort].split(",").last
             sort += ","
@@ -176,16 +176,19 @@ class FilesController < ApplicationController
           end
           @sort = order_by[0]
           @order = order_by[1]
-          if order_by.count == 1
+          if order_by.count == 1 && attribute
             sort += "#{Attachment.table_name}.#{attribute} asc "
-          elsif order_by.count == 2
-            sort += "#{Attachment.table_name}.#{attribute} #{order_by[1]} "
+            if sort_type != params[:sort].split(",").last
+              sort += ","
             end
+          elsif order_by.count == 2 && order_by[1]
+            sort += "#{Attachment.table_name}.#{attribute} #{order_by[1]} "
             if sort_type != params[:sort].split(",").last
               sort += ","
             end
           end
         end
+      end
 
       @containers = [ Course.includes(:attachments).reorder(sort).find(@course.id)]