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@awd
Created October 1, 2011 23:31
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Migrate local paperclip assets to Amazon S3.
##
# Use this behind the scenes to migrate files from your filesystem to Amazon S3
# %: rake paperclip_migration:migrate_to_s3
##
namespace :attachments do
desc "migrate files from filesystem to s3"
task :migrate_to_s3 => :environment do
require 'aws/s3'
# Load credentials
s3_options = YAML.load_file(File.join(Rails.root, 'config/s3.yml'))[Rails.env].symbolize_keys
bucket = s3_options[:bucket]
# Establish S3 connection
s3_options.delete(:bucket)
AWS::S3::Base.establish_connection!(s3_options)
# determine the models to migrate
klasses = [:article, :event, :user]
klasses.each do |klass_sym|
if @klass = real_klass(klass_sym)
if @klass.respond_to?(:attachment_definitions) && definitions = @klass.attachment_definitions
total_items = @klass.count
current_item = 1
@klass.all.each do |record|
definitions.each_pair do |column, value|
attachment = record.send(column.to_sym)
# NOTE: If the application is configured to use S3 already,
# calling exists? won't work as expected because paperclip will automatically look on Amazon.
if !attachment.exists?
total_items -= 1
next
end
styles = value[:styles].keys rescue []
styles.push(:original)
styles.each do |style|
# whatever mapping needed to where your files will live on S3
# in my case, I changed the URL when migrating to S3
path = attachment.url(style.to_sym).gsub('/system/files', '')
file = attachment.to_file(style.to_sym)
# skip if we already have this file on S3
next if AWS::S3::S3Object.exists?(path, bucket)
begin
print "uploading: #{style.to_sym}..."
AWS::S3::S3Object.store(path, file, bucket, :access => :public_read)
print " done.\n"
rescue AWS::S3::NoSuchBucket => e
AWS::S3::Bucket.create(bucket)
retry
rescue AWS::S3::ResponseError => e
raise
end
end
# fancy output
percent_complete = ((current_item.to_f / total_items.to_f) * 100).round(2)
puts "Completed: #{current_item} / #{total_items}: ~#{percent_complete}%"
current_item += 1
end
end
else
puts "There are no paperclip attachments defined for: #{@klass.to_s}"
end
else
puts "#{klass_sym.to_s.classify} is not an existing model."
end
end
end
def real_klass(key)
key.to_s.classify.constantize
rescue
end
end
@awd
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awd commented Oct 5, 2011

Thanks, it's definitely pulled and inspired from a few other "migrators" floating around.
I've updated the gist with your recommendation. The app I was building this for only had image assets, but I've got others with non-image assets.

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