Paperclip interpolation for filename db/actual mis-match

I'm making a small app to upload plain text files using Paperclip. I have an Upload model that has a document attachment. I want to rename the uploaded file so that it is the same as Upload.title.

I've used a Paperclip 开发者_JAVA技巧interpolation to do this.

#config/initializers/paperclip.rb
Paperclip.interpolates('upload_title') do |attachment, style|
  attachment.instance.title.parameterize
end

#app/models/upload.rb
has_attached_file :document,
  :url => "/:attachment/:id/:upload_title.:extension",
  :path => ":rails_root/public/:attachment/:id/:upload_title.:extension"

However, the file itself is renamed but the document_file_name in the database remains as it was.

I've made a test app and uploaded to github here

Here I create a new Upload and attach the file "Original File Name.txt"

garethrees.co.uk/misc/new.JPG

Here you see the new Upload created, still with the original file name.

garethrees.co.uk/misc/created.JPG

And also in the database, the document_file_name remains the same as it was.

garethrees.co.uk/misc/db.JPG

However, in the actual filesystem the document is renamed.

garethrees.co.uk/misc/finder.JPG

I really need both records to match as I need to use the Paperclip path in order for users to download the files.

Thanks

create a callback function for after_document_post_process where you set the document_file_name yourself to the title + extension.