how to define a field "last_update_time" in Migration , that can update automatically after executing the update statement successfully?

[GuoMonth]

After executing the update statement successfully, how to define the "last_update_time" field value update automatically in Migration?

expect something like this, but the on_update method doesn't actually exist.

manager
            .create_table(
                Table::create()
                    .table(Posts::Table)
                    .if_not_exists()
                    .col(
                        ColumnDef::new(Posts::Id)
                            .big_integer()
                            .not_null()
                            .auto_increment()
                            .primary_key(),
                    )
                  .col(
                        ColumnDef::new(Posts::LastUpdateTime)
                            .timestamp()
                            .default(Expr::current_timestamp())
                            .on_update(Expr::current_timestamp()) // doesn't actually exist, but expect
                            .not_null(),
                  )