ActiveJob::SerializationError: Unsupported argument type: Date/Class

Question

I am getting a weird error while passing class and date to an ActiveJob with the Sidekiq adapter.

1] pry(main)> StripeTransactionsSyncJob.perform_later(Stripe::SyncCharges, nil, 3.days.ago.to_date)
ActiveJob::SerializationError: Unsupported argument type: Class
from /home/amit/.rvm/gems/ruby-2.5.8@immosite/gems/activejob-5.0.7.2/lib/active_job/arguments.rb:83:in `serialize_argument'
[2] pry(main)> StripeTransactionsSyncJob.perform_later('Stripe::SyncCharges', nil, 3.days.ago.to_date)
ActiveJob::SerializationError: Unsupported argument type: Date
from /home/amit/.rvm/gems/ruby-2.5.8@immosite/gems/activejob-5.0.7.2/lib/active_job/arguments.rb:83:in `serialize_argument'

As per the doc, ActiveJob should support both types of arguments out of the box. What is wrong here?

Answer 1

The guide you have referenced in your post refers to the v6.1.4 of Rails. See the version info on top-right corner on that page.

The guide for v5.0 doesn't explicitly specify about the arguments types supported. And looking at the source code (see below) for the version of Rails you are using i.e 5.0.7.2

  def serialize_argument(argument)
    case argument
    when *TYPE_WHITELIST
      argument
    when GlobalID::Identification
      convert_to_global_id_hash(argument)
    when Array
      argument.map { |arg| serialize_argument(arg) }
    when ActiveSupport::HashWithIndifferentAccess
      result = serialize_hash(argument)
      result[WITH_INDIFFERENT_ACCESS_KEY] = serialize_argument(true)
      result
    when Hash
      symbol_keys = argument.each_key.grep(Symbol).map(&:to_s)
      result = serialize_hash(argument)
      result[SYMBOL_KEYS_KEY] = symbol_keys
      result
    else
      raise SerializationError.new("Unsupported argument type: #{argument.class.name}")
    end
  end

your passed argument types Class and Date are not supported and hence you are getting SerializationError.

Note: Whenever referring to the API-docs or Guide I would recommend to view them for the specific version of Rails you are using.