gistfile1.rb

# encoding: utf-8

require 'carrierwave/processing/mini_magick'

class PicUploader < CarrierWave::Uploader::Base

  include CarrierWave::MiniMagick

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

  # 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
    "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
  end

  def cache_dir
    "#{RAILS_ROOT}/tmp/uploads"
  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]
  #
   def scale(width, height)
     # do something
     resize_to_fit(width, height)
   end

  # Create different versions of your uploaded files
  version :thumb do
    process :resize_to_fill => [50, 50]
  end

  version :large do
    process :resize_to_fill => [500,300]
  end

  # 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

end