Check whether paperclip attachment is exists in callback

gistfile1.txt

In our app, we need to work out user profile completeness when a profile is saved. This is done via a callback. In this callback, we also check for the existance of Paperclip attachments. 

This should supposedly be done with the following:

`@user.document.exists?`

That, however, returns false in the callback while a file is being uploaded. It looks like it's stuck in limbo between deleting the old file and saving the new one. A solution to this is to simply use the following:

`@user.document?`