新增：上传文件新增字段返回

app/views/attachments/create.json.jbuilder

@@ -1,2 +1,7 @@
 json.id       @attachment.id
-json.filesize @attachment.filesize
+json.title @attachment.title
+json.filesize number_to_human_size(@attachment.filesize)
+json.is_pdf @attachment.is_pdf?
+json.url Rails.application.config_for(:configuration)['platform_url'] + (@attachment.is_pdf? ? download_url(@attachment,disposition:"inline") : download_url(@attachment)).to_s
+json.created_on @attachment.created_on.strftime("%Y-%m-%d %H:%M")
+json.content_type @attachment.content_type