How to access paperclip attachments on server side?

I am using paperclip to attach an excel file to a mode.

The purpose is to import the data from the excel file to the database.

Model: Import
has_attached_file: spreadsheet

For the import process, I want to access the file in my model as following.

path = "#{Rails.root}/public/#{spreadsheet.url}"    

This doesn't work. I guess because the url h开发者_如何学Cas the timestamp at the end.

In general what is the best way to access the attachments on server side ?

I think you're looking for the to_file method. You should be able to do something like this:

excel_file = self.spreadsheet.to_file

which will either return the uploaded file from the server (if you're using s3 or remote storage), or if it has been assigned to the model but not actually stored yet (if you haven't called model.save since it was uploaded), it returns the temp file stored on disk.

From there you should be able to use an excel gem or library to parse the contents.

Alternatively, you can use spreadsheet.url(nil, false) - the second parameter denotes whether or not to append a timestamp.

@spreadsheet.path

http://rdoc.info/gems/paperclip/2.3.8/Paperclip/Attachment#path-instance_method