carrierwave

https://github.com/carrierwaveuploader/carrierwave

Ruby

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

Mail::Message#default

Returns the default value of the field requested as a symbol.

Each header field has a :default method which returns the most common use case for
that field, for example, the date field types will return a DateTime object when
sent :default, the subject, or unstructured fields will return a decoded string of
their value, the address field types will return a single addr_spec or an array of
addr_specs if there is more than one.

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--Message-default-for-pr

# Commit to git

git add git commit -m "better docs for Mail::Message#default"

# 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--Message-default-for-pr

hub pull-request

# Celebrate!