Laravel 5 isDirty() 总是返回 false

I want to check if the model has been changed with isDirty method, but always returns false.

这是我的代码:

 if (!is_null($partnersData)) {
        foreach ($partnersData as $partnerData) {
            $partner = Partner::find($partnerData['partner_id']);
            $partner->update($partnerData);

            if($partner->isDirty()){
                dd('true');
            }
        }
    }

推荐答案

$model->update() 更新并保存模型.因此，$model->isDirty() 等于 false，因为自上次执行查询(查询数据库以保存模型)以来，模型没有更改.

$partner = Partner::find($id);

foreach ($partnerData as $column => $value) {
    if ($column === 'id') continue;

    $partner->$column = $value;
}

if ($partner->isDirty()) {
    // should be dirty now
}

$partner->save(); // $partner will be not-dirty from here