I’m trying to automatically fill in created_at and updated_at for my database records.

Here is my base class:

class ModelBase(DeclarativeBase):
    created_by = mapped_column(String)
    created_at = mapped_column(DateTime, default=func.now())
    updated_by = mapped_column(String)
    updated_at = mapped_column(DateTime, onupdate=func.now())

created_at gets filled in correctly when I first create the record. But updated_at does not

Here is some sample output:

        Field CreatedAt                 UpdatedAt
        -----------------------------------------
module3 None 2024-06-25 10:40:27.072737 None
module3 True 2024-06-25 10:40:27.072737 None

The field is simply a field that I updated. When the record is first created, it fills in CreatedAt and leaves UpdatedAt blank. When I update, UpdatedAt is not getting changed.