How to copy the values ​​of one column to another in yii2 during migration?

Question

Yii

there is a table with fields id, user email, birth_of_date
string birth_of_date in integer, I need to store dates in date I
create a new column during migration

$this->addColumn('table_name', 'new_birth_of_date', $this->date()->after('birth_of_date'));

trying to translate data with conversion

$this->update('table_name', ['new_birth_of_date' => 'FROM_UNIXTIME(birth_of_date)']);

but it reads 'FROM_UNIXTIME(birth_of_date)' as a string
if I just write 'birth_of_date' same
how do I copy values ​​from one column to another in migration?

Answer 1

$this->update('table_name', ['new_birth_of_date' => new Expression('FROM_UNIXTIME()')]);