Add function that is called before saving a model

[al3xius]

Feature request

Add a function which is called before saving.

Context

I want to implement a updated_at field that contains the Date/Time of the last update. This can easily be implemented with such a function. Other use cases include a field that is dependent on another field eg.: file_extention = "pdf" is dependent on file_path = "/home/Documents/test.pdf"

Solution

Add a "pre_save()" function in the "Model" class that can be implemented by Models. Call this function from the "engine._save()".

Alternative solutions

Calling a function every "save" manually.

Additional context

If added, this has also be added to the documentation.

[art049]

Hello thanks for the request.

Have you tried to use pydantic validators to achieve this?