Re-create versions using Carrierwave with Ruby

Question

The website I am working on is being redesigned and so our user images need to be changed. Currently, the website uses a carrier-supported camcorder to process all images and videos, and each image has a source file with a unique file name based on the following:

def filename if original_filename if model && model.read_attribute(:user_image).present? model.read_attribute(:user_image) else @name ||= "#{secure_token}.#{file.extension}" if original_filename.present? end end end 

and secure_token are generated

 def secure_token var = :"@#{mounted_as}_secure_token" model.instance_variable_get(var) or model.instance_variable_set(var, SecureRandom.uuid) end 

The task created for this:

 ## # CarrierWave Amazon S3 File Reprocessor Rake Task # # Written (specifically) for: # - CarrierWave # - Ruby on Rails 3 # - Amazon S3 # # Works with: # - Any server of which you have write-permissions in the Rails.root/tmp directory # - Works with Heroku # # Not tested with, but might work with: # - Ruby on Rails 2 # # Might work with, after a couple of tweaks: # - File System Storage # - Cloud Files Storage # - GridFS # # Examples: # # Reprocess all versions of User#avatar # rake carrierwave:reprocess class=User mounted_uploader=avatar # # Reprocess the versions: thumb, small, medium for User#avatar # rake carrierwave:reprocess class=User mounted_uploader=avatar versions='thumb, small, medium' # # Reprocess for an underlying association, for things like Embedded MongoDB Documents # which are models you cannot access directly, but rather through a regular Document # # Embeds One (picture) Association # rake carrierwave:reprocess class=User association=picture mounted_uploader=image versions='thumb, small, medium' # # Embeds Many (pictures) Association # rake carrierwave:reprocess class=User association=pictures mounted_uploader=image versions='thumb, small, medium' # # WARNING # There is an issue with "Rake", that you cannot name your mounted_uploader "file". # If you do this, then you will not be able to reprocess images through this rake task # class User # include Mongoid::Document # mount_uploader :file, PictureUploader # end # # This will NOT work with reprocessing through Rake because the mounted_uploader uses the "file" attribute. namespace :carrierwave do ## # Only tested with Amazon S3 Storage # Needs some minor modifications if you want to use this for File System Store, Cloud Files and GridFS probably. # This should work without Ruby on Rails as well, just set a different TMP_PATH. desc "Reprocesses Carrier Wave file versions of a given model." task :reprocess => :environment do ## # Load in the OPEN URI library to be able # to pull down and store the original file in a temp directory require 'open-uri' ## # Default constants TMP_PATH = "#{Rails.root}/tmp/carrierwave" ## # Set environment constants CLASS = ENV['class'].capitalize ASSOCIATION = ENV['association'] || nil MOUNTED_UPLOADER = ENV['mounted_uploader'].to_sym VERSIONS = ENV['versions'].nil? ? Array.new : ENV['versions'].split(',').map {|version| version.strip.to_sym} ## # Find the Model MODEL = Kernel.const_get(CLASS) ## # Create the temp directory %x(mkdir -p "#{TMP_PATH}") ## # Find all records for the provided Model records = MODEL.all ## # Output to console puts "\nCarrier Wave Version Reprocessing!" puts "=======================================" puts "Model: #{CLASS}" puts "Mounted Uploader: #{MOUNTED_UPLOADER}" puts "Association: #{ASSOCIATION}" if ASSOCIATION puts "Versions: #{VERSIONS.empty? ? "all" : VERSIONS.join(', ')}\n\n" ## # Run through all records records.each do |record| ## # Set the mounted uploader object # If it has a one-to-one association (singular) then that object # will be returned and wrapped in an array so we can "iterate" through it below. # # If it has a one-to-many association then it will return the array of associated objects # # If no association is specified, it assumes the amounted uploader is attached to the specified CLASS if ASSOCIATION if ASSOCIATION.singular? objects = [record.send(ASSOCIATION)] else objects = record.send(ASSOCIATION) end else objects = [record] end ## # Iterates through the objects objects.each do |object| ## # Returns the mounted uploader object mounted_object = object.send(MOUNTED_UPLOADER) ## # Retrieve Filename filename = mounted_object.path.split('/').last ## # Output to console puts "Reprocessing: #{filename}" ## # Read out the original file from the remote location # and write it out to the temp directory (TMP_PATH) # This file will be used as the base file to reprocess # the versions. Once all versions have been processed, # this temp file will be directly removed. open(mounted_object.url) do |original_object| File.open(File.join(TMP_PATH, filename), 'w') do |temp_file| temp_file.write(original_object.read) end end ## # By default it will add all available versions to the versions variable # which means that all available versions will be reprocessed. # If the "versions" argument has been provided, then only the specified # version(s) will be set to the versions variable, and thus, only these # will be reprocessed. versions = mounted_object.versions.map {|version| version[0]} versions = VERSIONS unless VERSIONS.empty? ## # Reprocesses the versions versions.each do |version| mounted_object.send(version).cache!(File.open(File.join(TMP_PATH, filename))) mounted_object.send(version).store! end ## # Removes the temp file %x(rm "#{TMP_PATH}/#{filename}") end end end end 

The problem is that when creating new images, the files are saved under the new file name, and not by the name specified in the image downloader, so the website cannot find them. The following is an example of how images are saved.

How it should be:

Source file: fdk392ks93_39ei.png

thumbnail version: thumb_fdk392ks93_39ei.png

Like this:

Source file: fdk392ks93_39ei.png

thumbnail version: thumb_fajeilkadifej_jakdjfi.png

Any help would be greatly appreciated.

Additional Information:

Model: User

Uploader: user_image (this is also the name of the column in which the folder / file name is stored)

Answer 1

After calling recreate_versions! you need to call save! in the model. You can check this question where someone asked basically the same thing.

Answer 2

README clearly states how to recreate Carrierwave versions:

https://github.com/jnicklas/carrierwave/blob/master/README.md

"You may encounter a situation where you want to retroactively change the version or add a new one. You can use the recreate_versions! Method to recreate versions from the base file. This uses a naive approach that will reload and process the specified version or all versions if none not passed as an argument.

 instance = MyUploader.new instance.recreate_versions!(:thumb, :large) 

Or on a connected bootloader:

 User.all.each do |user| user.avatar.recreate_versions! end