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PORecreate versions using Carrierwave with Ruby
 

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    <p>The website I am working on is going through a redesign and as such, our user images need to be re-sized. The website is currently using carrierwave gem to handle all image and video processing, and each image has a original file with a unique file name based on the following: </p> <pre><code>def filename if original_filename if model &amp;&amp; model.read_attribute(:user_image).present? model.read_attribute(:user_image) else @name ||= "#{secure_token}.#{file.extension}" if original_filename.present? end end end </code></pre> <p>and secure_token be generated by </p> <pre><code>def secure_token var = :"@#{mounted_as}_secure_token" model.instance_variable_get(var) or model.instance_variable_set(var, SecureRandom.uuid) end </code></pre> <p>The task that is created to do this is:</p> <pre><code>## # 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 =&gt; :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 </code></pre> <p>The problem is that while it creates the new images, the files are saved under a new file name rather than following the naming laid out in the image uploader, so the website cannot find them. The following is an example of how the images are stored.</p> <p>How it should be:</p> <p>Original file: fdk392ks93_39ei.png</p> <p>thumbnail version: thumb_fdk392ks93_39ei.png</p> <p>How it is:</p> <p>Original file: fdk392ks93_39ei.png</p> <p>thumbnail version: thumb_fajeilkadifej_jakdjfi.png</p> <p>Any help would be very appreciated.</p> <p>Other info:</p> <p>Model: User</p> <p>Uploader: user_image (this is also the column name which stores the folder/file name)</p>
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    1. COEdited portion: How it should be: Original file: fdk392ks93_39ei.png thumbnail version: thumb_fdk392ks93_39ei.png How it is: Original file: fdk392ks93_39ei.png thumbnail version: thumb_fajeilkadifej_jakdjfi.png
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