Php Laravel/Mysql:无法将字段设置为null

我正在从事一个laravel项目，并试图在mysql数据库中复制一条记录。 复制后，我想将字段值设置为null（约会状态）。 除了新记录的值（约会状态）与原始记录相同（即使我将其设置为null）外，其他一切都正常

    $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();

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请尝试以下方法，而不是整个代码块：

// 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,
]);

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