How to: Define different storage configuration for each Uploader.

It happens when an application needs to store uploaded files with carrierwave into two different storage repositories. This means the configuration needs to be done on a per uploader level dynamically instead of defining a single global configuration. The current code fragment defines an uploader with a global configuration override on the uploader level:

class AvatarUploader < CarrierWave::Uploader::Base
  # Choose what kind of storage to use for this uploader:
  storage :fog

  # define some uploader specific configurations in the initializer
  # to override the global configuration
  def initialize(*)
    super

    self.fog_credentials = {
      :provider               => 'AWS',              # required
      :aws_access_key_id      => 'YOURAWSKEYID',     # required
      :aws_secret_access_key  => 'YOURAWSSECRET',    # required
    }
    self.fog_directory = "YOURBUCKET"
  end
end

The sample above allows to override the globally defined fog-configuration for a single uploader very easily. This allows the app to use a second AWS location for a specific type of file with carrierwave.