'json', 'product_spec_id' => 'json']; public function __construct(array $attributes = []) { parent::__construct($attributes); //$this->timestamps = false; } public function order() { return $this->belongsTo(Order::class,'order_id','id'); } public function product() { return $this->belongsTo(Product::class,'product_id','id'); } public function supplier() { return $this->belongsTo(Supplier::class)->withTrashed(); } public function agent() { return $this->belongsTo(Agent::class)->withTrashed(); } }