CarrierWave multiple file types validation with single uploader

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

Although the answer has been accepted but I've got a better way for this. Try this code.

class MyUploader < CarrierWave::Uploader::Base
  def extension_white_list
    if model.feature_id == 1
      %w(jpg jpeg gif png)
    elsif model.feature_id == 2
      %w(pdf doc docx xls xlsx)
    elsif model.feature_id == 3
      %w(mp3 wav wma ogg)
    end
  end
end

feature_id == 1 means you want to allow just picture uploads, feature_id == 2 means that only documents will be allowed to be uploaded and feature_id == 3 will allow you to upload only audio files.

Hopefully it answers the question. You can add more checks for other types of files.

Answer 2

Define your white list in your uploader as shown in the docs for carrierwave.

class MyUploader < CarrierWave::Uploader::Base
  def extension_white_list
    %w(jpg jpeg gif png)
  end
end