ensl.org/app/uploaders/image_uploader.rb

# encoding: utf-8

class ImageUploader < CarrierWave::Uploader::Base
  # Include RMagick or ImageScience support:
  include CarrierWave::RMagick
  # include CarrierWave::ImageScience

  # Choose what kind of storage to use for this uploader:
  storage :file
  # storage :fog

  # Override the directory where uploaded files will be stored.
  # This is a sensible default for uploaders that are meant to be mounted:
  def store_dir
    "images"
  end

  # Override filename
  def filename
    model.id.to_s + File.extname(@filename) unless @filename.nil?
  end

  # Provide a default URL as a default if there hasn't been a file uploaded:
  # def default_url
  #   "/images/fallback/" + [version_name, "default.png"].compact.join('_')
  # end

  # Process files as they are uploaded:
  # process :scale => [200, 300]

  # Add a white list of extensions which are allowed to be uploaded.
  # For images you might use something like this:
  def extension_white_list
    %w(jpg jpeg gif png)
  end

  # Override the filename of the uploaded files:
  # Avoid using model.id or version_name here, see uploader/store.rb for details.
  # def filename
  #   "something.jpg" if original_filename
  # end
end