论坛编辑的时候上传文件后没有显示

app/views/memos/edit.html.erb

@@ -21,10 +21,7 @@
           $.ajax({
               url:' /forums/'+'<%= @memo.forum_id.to_s %>'+'/memos/<%= @memo.id.to_s%>',
               type:'put',
-              data:{
-                'memo[subject]':$("#memo_subject").val(),
-                 'memo[content]':$("#memo_content").val()
-              },
+              data:$("#edit_memo").serialize(),
               success:function(data){
 
               },