Laravel/Mysql：无法将字段设置为空

Question

我正在开发一个 laravel 项目并试图在 mysql db 中复制一条记录。 复制后，我想将字段值设置为 null（appointment_status）。 一切正常，除了新记录的值 (appointment_status) 与原始记录相同，即使我将其设置为 null。

    $newAppointment = $appointment->replicate();
    //push to get the id for the cloned record
    $newAppointment->push();
    $newAppointment->duplicated_from_id = $appointment->id;
    $newAppointment->appointment_status = null;
    $newAppointment->save();
    //updating the old appointment
    $appointment->duplicated_to_id = $newAppointment->id;
    $appointment->save();

Answer 1

而不是整个代码块，尝试这样的事情：

// replicate as the new record with some different fields
$newAppointment = $appointment->replicate()->fill([
    'duplicated_from_id' => $appointment->id,
    'appointment_status' => null,
])->save();

// update some fields of initial original record
$appointment->update([
    'duplicated_to_id' => $newAppointment->id,
]);

更多信息请查看this。