mysql - Laravel 4 将数据库字段更新为空 - 错误

Question

这段代码给我一个错误:

$post = Post::find($post_id);
$post->deleted_at = null;
$post->save();

这是错误:

Creating default object from empty value

也试过

$post->deleted_at = '';

这给了我同样的错误。

Answer 1

如果它没有找到您在该变量中有 null 的模型，那么您可以:

$post = Post::findOrNew($post_id); /// If it doesn't find, it just creates a new model and return it

$post->deleted_at = null;

$post->save();

但如果你真的需要它存在:

$post = Post::findOrFail($post_id); /// it will raise an exception you can treat after

$post->deleted_at = null;

$post->save();

而且，如果这无关紧要:

if ($post = Post::find($post_id)) 
{
    $post->deleted_at = null;

    $post->save();
}