记 Laravel-admin Form 表单 BelongsTo 关系模型在保存前修改的注意事项

$form->text('baz');
$form->hidden('user.foo');

$form->saving(function (Form $form) {
    /** 错的 
    报间接修改重载属性错误
    Indirect modification of overloaded property
    **/
    $form->user['foo'] = $form->baz;
    //正确写法
    $form->user = ['foo' => $form->baz];
});

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