Wrong data format for automatic detection. .aiinstead of .pdf

[brunto]

When I submit a PDF file base64 encoded like this data:application/pdf;base64,JVBERi0xLjQKJfjl0MTGCjEgMCBvYmoKPDwgL........... the automatic detection change the extension from .pdf to .ai.

I use:

gem 'carrierwave', '~> 1.3.1'
gem 'carrierwave-base64', '~> 2.8.0'

Here is my code:

    file = params[:attachment][:file]
    @attachment = Attachment.new(attachment_params)
    file = file.gsub('data:application/octet-stream;base64', "data:#{@attachment.mime_type};base64")
    @attachment.attached_file = file
    @attachment.save

ps: When I submit an image base64 everything works fine.

Any idea?

[brunto]

I found this:

MIME::Types['data:application/pdf'].last.preferred_extension
=> "ai"

[brunto]

See: mime-types/ruby-mime-types#143

[halostatue]

This is not a bug in mime-types, but in mime-types-data. Update that gem to 3.2019.1009 and the issue will fix itself. Resolved in mime-types/mime-types-data#24.