carrierwave

https://github.com/carrierwaveuploader/carrierwave

Ruby

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

Mail::Utilities#blank?

Returns true if the object is considered blank.
A blank includes things like '', '   ', nil,
and arrays and hashes that have nothing in them.

This logic is mostly shared with ActiveSupport's blank?

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--Utilities-blank--for-pr

# Commit to git

git add git commit -m "better docs for Mail::Utilities#blank?"

# 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--Utilities-blank--for-pr

hub pull-request

# Celebrate!