ActiveJob compatibility for Rails 5.2 -> 6.0 upgrade

active_job_deserializer_extension.rb

# File: config/initializers/active_job_deserializer_extension.rb
return unless (VERSION::MAJOR == 5 && VERSION::MINOR == 2)

require "active_job/arguments"

module ActiveJobDeserializerExtension
  # This copies the hash deserialization from activejob 6.0 so activejob 5.2 is forwards compatible, it can run jobs
  # with hash args that were serialized by activejob 6.0. This allows Rails 5.2 and 6.0 to run within the same app
  # during the upgrade period.
  def deserialize_hash(serialized_hash)
    result = serialized_hash.transform_values { |v| deserialize_argument(v) }
    if result.delete('_aj_hash_with_indifferent_access')
      result = result.with_indifferent_access
    elsif symbol_keys = result.delete('_aj_symbol_keys')
      result = transform_symbol_keys(result, symbol_keys)
    elsif symbol_keys = result.delete('_aj_ruby2_keywords')
      # _aj_ruby2_keywords was added in activejob 6.0, this elsif block is missing in activejob 5.2. Adding it here
      # makes activejob 5.2 forwards-compatible to run kwarg jobs enqueued by activejob 6.0.
      result = transform_symbol_keys(result, symbol_keys)
      result = Hash.ruby2_keywords_hash(result)
    end
    result
  end
end

ActiveJob::Arguments.extend ActiveJobDeserializerExtension