Carrierwave example file

gistfile1.txt

# User Avatar Uploader
class UserAvatarUploader < CarrierWave::Uploader::Base
  include CarrierWave::MiniMagick

  storage :file

  def move_to_cache
    true
  end

  def move_to_store
    true
  end

  def cache_dir
    if Rails.env.test? || Rails.env.cucumber?
      "#{Rails.root}/spec/support/uploads/tmp"
    else
      "#{Rails.root}/public/uploads/tmp"
    end
  end

  def store_dir
    dir = '/public/uploads/'
    dir = '/spec/support/uploads/' if Rails.env.test? || Rails.env.cucumber?
    "#{Rails.root}#{dir}#{model.class.to_s.underscore}/#{model.id}"
  end

  def filename
    fname = "#{model.class.to_s.underscore}"
    tstamp = "#{Time.now.strftime('%Y%m%d%H%M%S')}"
    orig_fname = original_filename
    "#{fname}#{tstamp}#{model.avatar.file.extension}" if orig_fname
  end

  version :large do
    process resize_to_fill: [600, 600]
  end

  version :medium do
    process resize_to_fill: [300, 300]
  end

  version :small do
    process resize_to_fill: [150, 150]
  end

  version :thumb do
    process resize_to_fill: [64, 64]
  end

  # whitelisting
  def extension_white_list
    %w(jpg jpeg gif png)
  end

  # set a default image
  def default_url
    image_name = [version_name, 'default-user.png'].compact.join('_')
    ActionController::Base.helpers.asset_path "fallback/#{image_name}"
  end
end