Helper method to get the URL to an ActiveStorage Blob/Variant

application_record.rb

# frozen_string_literal: true

class ApplicationRecord < ActiveRecord::Base
  self.abstract_class = true

  def attached_url_for(attached, variant: nil, cloudfront_endpoint: ENV['CLOUDFRONT_ENDPOINT'], fallback_url: nil)
    if attached.attached?
      attached = attached.variant variant if variant
      path_helper = Rails.application.routes.url_helpers.method :rails_blob_path

      if cloudfront_endpoint
        path_helper = Rails.application.routes.url_helpers.method :rails_representation_path if variant
        URI.join(cloudfront_endpoint, path_helper[attached]).to_s
      else
        Rails.application.routes.url_helpers.url_for attached
      end
    else
      fallback_url || ActionController::Base.helpers.image_url('default-organization-logo.gif')
    end
  end
end