We have a Rails 6.1 application running an after_commit callback to look into saved_changes value to run some background workers. But the issue is saved_changes returns empty if a model has accepts_nested_attributes_for. It is not only after_commit other callbacks like before_save, and around_save also return empty saved_changes value.

For example.

on models/profile.rb

after_commit :run_worker, on: :update

belongs_to :user
accepts_nested_attributes_for :user

In this case saved_changes is {} but if I remove the accepts_nested_attributes_for it works fine and gives me the changed value.

It is a known issue caused by double saves as mentioned on this GH issue. The workaround for 7.1 is adding config on the application.rb

config.active_record.run_commit_callbacks_on_first_saved_instances_in_transaction = true

This default is for Rails 7.1 and does not work for 6.1. Has someone else run through this issue and has a workaround?