Restrict file upload to some file extensions

Question

I am having a problem with uploading files. I want to allow users to upload files that the system allows...

For example, I allow files having an extension of *.j

Answer 1

Firstly you can use extname method to validate files you are saving. http://apidock.com/ruby/File/extname/class

Secondly I use Paperclip gem https://github.com/thoughtbot/paperclip for uploading files. There is validate_attachment_content_type method for validating extensions: http://rdoc.info/gems/paperclip/2.3.8/Paperclip/ClassMethods#validates_attachment_content_type-instance_method