Is there is a way to detect previous changes in serialized hash attribute in ruby

I am trying to detect changes in a hash attribute in my model. But I am not able to detect changes because it is serialized. I am trying to detect changes after_commit callback.

Here is the code //

settings.rb

serialize :additional_settings, Hash after_commit :publish_to_central

def publish_to_central if self.previous_changes.present? account.model_changes = self.previous_changes.to_hash end end

after updating the additional_settings hash, the value gets updated but self.previous_changes returns empty.

I am not able to detect changes only for serialized hash and array attributes, remaining works fine. Can anyone help with this.