Change ActiveStorage DirectDisk service configuration at runtime - ruby-on-rails

Question

I am using Rails 5.2 and ActiveStorage 5.2.3 and DirectDiskService.
In order to have user uploads grouped nicely in directories and in order to be able to use CDNs as I please (eg CloudFlare or CloudFront or any other), I am trying to set up a method in ApplicationController that sets the (local) path for uploads, something like:
class ApplicationController < ActionController::Base
before_action :set_uploads_path
# ...
private
def set_upload_paths
# this doesn't work
ActiveStorage::Service::DirectDiskService.set_root p: "users/#{current_user.username}"
# ... expecting the new root to become "public/users/yaddayadda"
end
end
In config/initializers/active_storage.rb I have:
module SetDirectDiskServiceRoot
def set_root(p:)
#root = Rails.root.join("public", p)
#public_root = p
#public_root.prepend('/') unless #public_root.starts_with?('/')
end
end
ActiveStorage::Service::DirectDiskService.module_eval { attr_writer :root }
ActiveStorage::Service::DirectDiskService.class_eval { include SetDirectDiskServiceRoot }
It does let me set the root on a new instance of the service but not on the one the Rails application is using.
What am I doing wrong? Or how do I get this done?

Answer 1

Here's a dirty hack that helps you keep your local (disk) uploads grouped nice under public/websites/domain_name/uploads.
Step 1) install ActiveStorage DirectDisk service from here: https://github.com/sandrew/activestorage_direct_disk
Step 2) in app/models/active_storage/current.rb
class ActiveStorage::Current < ActiveSupport::CurrentAttributes #:nodoc:
attribute :host
attribute :domain_name
end
Step 3) lib/set_direct_disk_service_path.rb
module SetCurrentDomainName
def set_domain_name(d)
self.domain_name = d
end
end
ActiveStorage::Current.class_eval { include SetCurrentDomainName }
module SetDirectDiskServiceRoot
def initialize(p:, public: false, **options)
#root = Rails.root.join("public", p)
#public_root = p
#public_root.prepend('/') unless #public_root.starts_with?('/')
puts options
end
def current_domain_name
ActiveStorage::Current.domain_name
end
def folder_for(key)
# original: File.join root, folder_for(key), key
p = [ current_domain_name, "uploads", "all", key ]
blob = ActiveStorage::Blob.find_by(key: key)
if blob
att = blob.attachments.first
if att
rec = att.record
if rec
p = [ current_domain_name, "uploads", rec.class.name.split("::").last.downcase, rec.id.to_s, att.name, key ]
end
end
end
return File.join p
end
end
ActiveStorage::Service::DirectDiskService.module_eval { attr_writer :root }
ActiveStorage::Service::DirectDiskService.class_eval { include SetDirectDiskServiceRoot }
Step 4) in config/initializers/active_storage.rb
require Rails.root.join("lib", "set_direct_disk_service_path.rb")
Step 5) in app/controllers/application_controller.rb
before_action :set_active_storage_domain_name
# ...
def set_active_storage_domain_name
ActiveStorage::Current.domain_name = current_website.domain_name # or request.host
end
Step 6) in config/storage.yml
development:
service: DirectDisk
root: 'websites_development'
production:
service: DirectDisk
root: 'websites'
Disadvantages:
While ActiveRecord technically "works", it's missing some very important features that make it unusable for most people, so eventually the developer(s) will listen and adjust; at that time you may need to revisit this code AND all of your uploads.
The service attempts to "guess" the class name a blob is attached to since AS doesn't pass that, so it runs extra 2-3 queries against your database. If this bothers you just remove that bit and let it all go under websites/domain_name/uploads/all/
In some cases (eg variants, or a new record with action_text column) it can't figure out the attachment record and its class name, so it will upload under websites/domain/uploads/all/...