As it turns out - DiskService aka. local storage uses a different folder structure than the cloud services. Thats really weird.
DiskService uses as folders part of the first chars of the key.
Cloud services just use the key and put all variants in a separate folder.
Created a rake task to copy files over to cloud services. Run it with rails active_storage:migrate_local_to_cloud storage_config=google
for example.
namespace :active_storage do
desc "Migrates active storage local files to cloud"
task migrate_local_to_cloud: :environment do
raise 'Missing storage_config param' if !ENV.has_key?('storage_config')
require 'yaml'
require 'erb'
require 'google/cloud/storage'
config_file = Pathname.new(Rails.root.join('config/storage.yml'))
configs = YAML.load(ERB.new(config_file.read).result) || {}
config = configs[ENV['storage_config']]
client = Google::Cloud.storage(config['project'], config['credentials'])
bucket = client.bucket(config.fetch('bucket'))
ActiveStorage::Blob.find_each do |blob|
key = blob.key
folder = [key[0..1], key[2..3]].join('/')
file_path = Rails.root.join('storage', folder.to_s, key)
file = File.open(file_path, 'rb')
md5 = Digest::MD5.base64digest(file.read)
bucket.create_file(file, key, content_type: blob.content_type, md5: md5)
file.close
puts key
end
end
end