“created_at”列中的Laravel空值违反了数据透视表

Question

我在数据透视表中保存数据时出现以下错误

Not null violation: 7 ERROR: null value in column "created_at" violates not-null constraint DETAIL: Failing row contains (4, 10, 16, null, null). (SQL: insert into "child_packages" ("child_id", "package_id") values (10, 16))

这是我在表格中保存数据的代码

    $child = $this->child_section->create($input);


    $packages_ids = Input::get('package_id');
    $child->Packages()->sync($packages_ids);

并在儿童模型中

 public function Packages()
{
    return  $this->belongsToMany('FoodPackage');
}

对于数据库我正在使用postgresql

Answer 1

你有添加方法 whitTimestamps();

示例：

$this->belongsToMany(Model::class)->withTimestamps();

https://laravel.com/docs/8.x/eloquent-relationships#has-many-through