Default values and custom type handling before queuing a job. Just include this module in your ActiveJob class

default_job_options.rb

module DefaultJobOptions
  extend ActiveSupport::Concern

  included do
    before_enqueue do |job|
      job.scheduled_at ||= 10.seconds.from_now.to_f
      job.arguments = job.arguments_with_safe_types
    end
  end

  def arguments_with_safe_types
    arguments.map { |arg| cast_argument_to_safe_type(arg) }
  end

  def cast_argument_to_safe_type(argument)
    case argument
    when BigDecimal
      argument.to_f
    when ActiveRecord::AssociationRelation
      argument.to_a
    when Array
      argument.map { |arg| cast_argument_to_safe_type(arg) }
    when Hash
      argument.each_with_object({}) do |(key, value), hash|
        hash[ActiveJob::Arguments.send(:serialize_hash_key, key)] = cast_argument_to_safe_type(value)
      end
    else
      argument
    end
  end
end