Question

How to validate the extension of uploaded file when using single uploader for multiple file type?

I am using the single model namely Asset containing the attribute file. Uploader is mounted on file attribute. Asset model having one more attribute called feature_id. feature_id refers to features like video, audio, etc.

So, how should I validate the file type with multiple extension whitelist depending upon feature_id value?

Using ruby 1.9 and rails 3.2.11

Any help will be greatly appreciated.

Answer 1

I ran into the exact same use case:

In Asset.rb
Validate the format of the filename

validates :asset_file,
                 format:{
                    with: %r{\.(pdf|doc|png)$}i, message: "Wrong file format"
                        }

Use a regular expression to test the file name:

Here you can play with the regex:
http://rubular.com/r/Z3roRDDXAf

Hope this helps!