carrierwave

https://github.com/carrierwaveuploader/carrierwave

Ruby

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

CarrierWave::Uploader::Mountable#initialize

If a model is given as the first parameter, it will be stored in the
uploader, and available through +#model+. Likewise, mounted_as stores
the name of the column where this instance of the uploader is mounted.
These values can then be used inside your uploader.

If you do not wish to mount your uploaders with the ORM extensions in
-more then you can override this method inside your uploader. Just be
sure to call +super+

=== Parameters

[model (Object)] Any kind of model object
[mounted_as (Symbol)] The name of the column where this uploader is mounted

=== Examples

    class MyUploader < CarrierWave::Uploader::Base

      def store_dir
        File.join('public', 'files', mounted_as, model.permalink)
      end
    end

Source | Google | Stack overflow

Edit

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

cd carrierwave

open lib/carrierwave/uploader/mountable.rb

Contribute

# Make a new branch

git checkout -b -your-name--update-docs-CarrierWave--Uploader--Mountable-initialize-for-pr

# Commit to git

git add lib/carrierwave/uploader/mountable.rbgit commit -m "better docs for CarrierWave::Uploader::Mountable#initialize"

# Open pull request

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

hub fork

git push <your name> -your-name--update-docs-CarrierWave--Uploader--Mountable-initialize-for-pr

hub pull-request

# Celebrate!