php - 在一对多关系 laravel 5 中保存多条记录

Question

我试图在一对多关系中保存多条记录。我有以下两个模型。

Product Model

class Product extends Model
{
    protected $primaryKey = 'product_id';
    public $timestamps = FALSE;

    public function Size(){
        return $this->hasMany('App\Size');
    }

}

Size Model

class Size extends Model
{
    public $timestamps = FALSE;
    protected $fillable = ['product_id','size'];

    public function Product(){
        return $this->belongsTo('App\Product');
    }
}

我想保存产品的尺寸。我的 Controller 是

public function store(Request $request){

        $product_id = Products::select('product_id')->orderBy('product_id','desc')->first();

        if($request->size_m) $sizes[] = array("size" => $request->size_m );
        if($request->size_l) $sizes[] = array("size" => $request->size_l);
        if($request->size_s) $sizes[] = array("size" => $request->size_s);

        $product_id->Size()->saveMany($sizes);


    }

但是我收到以下错误

FatalThrowableError in HasOneOrMany.php line 221: Type error: Argument 1 passed to Illuminate\Database\Eloquent\Relations\HasOneOrMany::save() must be an instance of Illuminate\Database\Eloquent\Model, array given, called in D:\e-commerec\blog\vendor\laravel\framework\src\Illuminate\Database\Eloquent\Relations\HasOneOrMany.php on line 237

问题是什么？

Answer 1

好的，让我们从 https://laravel.com/docs/5.4/eloquent-relationships 中的示例开始:

$post = App\Post::find(1);

$post->comments()->saveMany([
    new App\Comment(['message' => 'A new comment.']),
    new App\Comment(['message' => 'Another comment.']),
]);

问题

你用数组传递一个数组。这是错误的。

解决方案

您需要传递一个包含Size 对象 的数组，简化如下:

$product_id->Size()->saveMany([
    new App\Size(['size' => 1])    
]);