修改可对文件进行增、删等操作

app/controllers/homework_attach_controller.rb

@@ -70,7 +70,9 @@ class HomeworkAttachController < ApplicationController
     description = params[:homework_description]
     @homework.name = name
     @homework.description = description
-    #@homework.save_attachments(params[:attachments])
+    if params[:attachments]
+      @homework.save_attachments(params[:attachments])
+    end
     if @homework.save
       respond_to do |format|
         format.html { redirect_to project_for_bid_path @homework.bid }