app/conversions/power_converters/access_url.rb
require 'power_converters/access_path'
PowerConverter.define_conversion_for(:access_url) do |input|
case input
when Sipity::Models::Attachment
input.file_url
else
File.join(Figaro.env.url_host, PowerConverter.convert(input, to: :access_path))
end
end