diff --git a/app/controllers/files_controller.rb b/app/controllers/files_controller.rb
index a6eafe0f3..791d145c2 100644
--- a/app/controllers/files_controller.rb
+++ b/app/controllers/files_controller.rb
@@ -172,17 +172,17 @@ class FilesController < ApplicationController
       attachment_ids.each do |attachment_id|
         ori = Attachment.find_by_id(attachment_id)
         # 同一个资源可以多次发送到课堂
-        @course.attachments.each do |att|
-          @exist = false
-          if att.id == ori.id || (!att.copy_from.nil? && !ori.copy_from.nil? && att.copy_from == ori.copy_from) || att.copy_from == ori.id || att.id == ori.copy_from
-            att.created_on = Time.now
-            att.save
-            @exist = true
-            break
-          end
-        end
-
-        next if @exist
+        # @course.attachments.each do |att|
+        #   @exist = false
+        #   if att.id == ori.id || (!att.copy_from.nil? && !ori.copy_from.nil? && att.copy_from == ori.copy_from) || att.copy_from == ori.id || att.id == ori.copy_from
+        #     att.created_on = Time.now
+        #     att.save
+        #     @exist = true
+        #     break
+        #   end
+        # end
+        #
+        # next if @exist
         attach_copied_obj = ori.copy
         attach_copied_obj.container = @course
         attach_copied_obj.created_on = Time.now