ActiveStorage direct upload subfolders

When using S3, Rails does not let you configure subfolders for active storage. Every attachment lives at the root of your bucket.

This is not recommended, but cannot be helped

The only way to store attachments into subfolders is to monkey patch the direct uploads controller:

# config/initializer/direct_uploads_monkey_path.rb
Rails.application.config.to_prepare do
  class ActiveStorage::DirectUploadsController < ActiveStorage::BaseController
    def create
      key = "#{sub_dir}/#{user.id}/#{ActiveStorage::Blob.generate_unique_secure_token}"
      upload_attrs = {key:}.merge(blob_args)
      blob = ActiveStorage::Blob.create_before_direct_upload!(**upload_attrs)
      render json: direct_upload_json(blob)
    end

    private

    def user
      @user ||= User.enabled.find(session[:current_user_id])
    end

    def sub_dir
      if /cool-uploads/.match?(request.referer)
        "cool-uploads"
      elsif /company-settings/.match?(request.referer)
        "companies"
      else
        "uploads"
      end
    end
  end
end