synchronize clears all changes information, is there a way to sync data from the database but preserve previous_changes?

[nerdrew]

Title says it all. I'd like to be able to synchronize data from the database (created_at, updated_at, autoinc id, etc), but still have previous_changes be correct. I'm trying to run before_* and after_* hooks, but my after hooks rely often check previous_changes to check if they should run.

Current behavior:

MyModel.import(new_records, synchronize: [new_records])
new_records[0].previous_changes #=> {}

(My) Expected behavior:

MyModel.import(new_records, synchronize: [new_records])
new_records[0].previous_changes #=> { id: [nil, 1], created_at: [nil, Time.now], updated_at: [nil, Time.now] }

[jkowens]

I do not believe so. Can you synchronize first then make changes to your model data?