实训附件问题

app/controllers/attachments_controller.rb

@@ -217,8 +217,10 @@ class AttachmentsController < ApplicationController
   end
 
   def conversion_container_id id, type
-    if type == 'Shixun'
+    if id.is_a?(String) && type == 'Shixun'
       Shixun.find_by_identifier(id).id
+    else
+      id
     end
   end
 end