gistfile1.rb

# encoding: utf-8

class AvatarUploader < 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 :s3

  # 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
    "avatars/#{model.username}"
  end

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

  # Process files as they are uploaded:
  # process :scale => [200, 300]
  #
  # def scale(width, height)
  #   # do something
  # end

  # Create different versions of your uploaded files:
  process :resize_to_fit => [60,60]

  version :tiny do
    process :resize_to_fit => [18, 18]
  end

  version :large do
    process :resize_to_fit => [100,100]
  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

  # Override the filename of the uploaded files:
  def filename
    "avatar.png" if original_filename
  end

end