carrierwave

https://github.com/carrierwaveuploader/carrierwave

Ruby

Classier solution for file uploads for Rails, Sinatra and other Ruby web frameworks

Mail::Encodings::TransferEncoding.can_encode?

Override in subclasses to indicate that they can encode text
that couldn't be directly transported, e.g. Base64 has 7bit output,
but it can encode binary.

Source | Google | Stack overflow

Edit

git clone [email protected]:carrierwaveuploader/carrierwave.git

cd carrierwave

open

Contribute

# Make a new branch

git checkout -b -your-name--update-docs-Mail--Encodings--TransferEncoding-can_encode--for-pr

# Commit to git

git add git commit -m "better docs for Mail::Encodings::TransferEncoding.can_encode?"

# Open pull request

gem install hub # on a mac you can `brew install hub`

hub fork

git push <your name> -your-name--update-docs-Mail--Encodings--TransferEncoding-can_encode--for-pr

hub pull-request

# Celebrate!