Use of appends laravel

step1: need to show total price of products 
add appends to your Order model 
    1. add this on top protected $appends = ['total_purchase_price', 'update_url'];
    
    2. add functions 
    // This is another models 
    public function orderItems() {
        return $this->hasMany('App\OrderItem', 'order_id');
    }

    public function getTotalPurchasePriceAttribute($value)
    {
        $sum = 0;
        foreach($this->orderItems as $order_item){
            if(isset($order_item->purchase_price)){
                $sum += ($order_item->purchase_price * $order_item->qty);
            }else{
                $sum += ($order_item->price * $order_item->qty);
            }
        }
        return $sum;
    } // 
    
    In view file call like this 
    $order->total_purchase_price
    3. to get url simply add this in your model 
    public function getUpdateUrlAttribute()
    {
        return route('route_name',$this->id);
    }