附件为pdf的添加判断，并修改链接

app/views/attachment_histories/_attachment_history.json.jbuilder

@@ -6,6 +6,7 @@ json.publish_time attachment.publish_time
 json.quotes attachment.quotes_count
 json.downloads_count attachment.downloads_count
 json.created_on attachment.created_on
-json.url attachment_path(attachment, type: 'history').gsub("/api","")
+# json.url attachment_path(attachment, type: 'history').gsub("/api","")
 json.is_pdf attachment.is_history_pdf?
+json.url attachment.is_history_pdf? ? attachment_path(attachment, type: 'history').gsub("/api","") : attachment_path(attachment, type: 'history')
 json.attachment_id attachment.attachment_id

app/views/attachments/_attachment.json.jbuilder

@@ -11,6 +11,7 @@ json.quotes attachment.quotes_count
 json.description attachment.description
 json.downloads_count attachment.downloads_count
 json.created_on attachment.created_on
-json.url download_url(attachment)
+json.is_pdf attachment.is_pdf?
+json.url attachment.is_pdf? ? download_url(attachment).gsub("/api","") : download_url(attachment)
 
 # json.url download_url(attachment) unless attachment.locked?(@is_member)

app/views/attachments/_attachment_simple.json.jbuilder

@@ -2,5 +2,7 @@ json.id attachment.id
 json.title attachment.title
 json.filesize  number_to_human_size attachment.filesize
 json.description attachment.description
-json.url download_url(attachment)
+json.is_pdf attachment.is_pdf?
+json.url attachment.is_pdf? ? download_url(attachment).gsub("/api","") : download_url(attachment)
+# json.url download_url(attachment)
 json.set! :delete, delete.nil? ? true : delete if defined? delete

app/views/attachments/_attachment_small.json.jbuilder

@@ -1,6 +1,6 @@
 json.id attachment.id
 json.title attachment.title
 json.filesize number_to_human_size(attachment.filesize)
-json.url download_url(attachment)
+json.is_pdf attachment.is_pdf?
+json.url attachment.is_pdf? ? download_url(attachment).gsub("/api","") : download_url(attachment)
 json.created_on attachment.created_on
-json.is_pdf attachment.is_pdf?

app/views/files/histories.json.jbuilder

@@ -1,9 +1,3 @@
 
-# json.partial! 'attachments/attachment_small', attachment: @file
-json.id @file.id
-json.title @file.title
-json.filesize number_to_human_size(@file.filesize)
-json.url download_url(@file).gsub("/api","")
-json.created_on @file.created_on
-json.is_pdf @file.is_pdf?
+json.partial! 'attachments/attachment_small', attachment: @file
 json.partial! "attachment_histories/list", attachment_histories: @attachment_histories