（1/1）异常属性[price]在该集合实例上不存在。 （Laravel 5.4）

Question

I have this function on Cart Model

//Cart.php

<?php

namespace App;


class Cart
{
    public $items= null;
    public $totalQty=0;
    public $totalPrice=0;
    public function __construct($oldCart){
        if($oldCart){
            $this->items= $oldCart->items;
            $this->totalQty= $oldCart->totalQty;
            $this->totalPrice= $oldCart->totalPrice;


        } 
    }


 public function addCart($item, $id){

      $storedItem=['qty'=>0, 'item'=>$item, 'price'=>$item->price];
        if($this->items){
            if(array_key_exists($id, $this->items)){
                $storedItem= $this->items[$id];
            }
        }
        $storedItem['qty']++;
        $storedItem['price'] *= $storedItem['qty'];
        $this->items[$id]= $storedItem;
        $this->totalQty++;
        $this->totalPrice +=$storedItem['price'];
   }


}

and this is my function on my controller

public function addToCart(Request $request, $id){
    $pork=Pork::where('did', $id)->get();
    $oldCart=Session::has('cart') ? Session::get('cart') : null;
    $cart= new Cart($oldCart);
    $cart->addCart($pork, $id);
  $request->session()->put('cart', $cart);

 return redirect()->route('user.index', compact('pork'));

}

I am trying to get the price so I could calculate it. The code is working well, but when i tried adding 'price'=>$item->price on the storedItem array. It is giving error which is (1/1) Exception Property [price] does not exist on this collection instance. (Laravel 5.4)

$storedItem=['qty'=>0, 'item'=>$item, 'price'=>$item->price];

could anyone help me? what should i do with this?

here is my blade view

@if(isset(Session::get('cart')->items))
@foreach(Session::get('cart')->items as $crt)
@foreach($crt['item'] as $pork)
        <dl class="dl-horizontal">
            <div id="cartdiv">  
              <dt>
               <div>
                 <input type="number" min="1" value="{{$crt['qty']}}">

               </dt>
              <dd>
                <label>
                <b>&nbsp;&nbsp;{{$pork['pork_name']}}</b>
                </label>
               </dd>
                 <dt>
                <label"> Price: <b id="bprice"  name="price">{{$pork['basePrice']}}</b></label>
                </dt>
                 <dd>
                <label>Total Amount: 200.00</label>
                </dd>
              </dt>
          </div>
      </dl>
@endforeach
@endforeach
 @endif

Answer 1

get() will return a collection even if only 1 result found, you can use first() to get the first result.

Just change $pork=Pork::where('did', $id)->get(); to $pork=Pork::where('did', $id)->first();

view file should changed to

@if(isset(Session::get('cart')->items))
@foreach(Session::get('cart')->items as $crt)
        <dl class="dl-horizontal">
            <div id="cartdiv">  
              <dt>
               <div>
                 <input type="number" min="1" value="{{$crt['qty']}}">

               </dt>
              <dd>
                <label>
                <b>&nbsp;&nbsp;{{$crt['item']->name}}</b>
                </label>
               </dd>
                 <dt>
                <label"> Price: <b id="bprice"  name="price">{{$crt['item']->price}}</b></label>
                </dt>
                 <dd>
                <label>Total Amount: 200.00</label>
                </dd>
              </dt>
          </div>
      </dl>
@endforeach
@endif

Answer 2

As @wanghanlin has stated - you need to pick the first record from the collection - also Session::get() has second argument, which by default is null so you could refactor as:

public function addToCart(Request $request, $id)
{

    $pork = Pork::where('did', $id)->get()->first() ?? new Pork;
    $oldCart = Session::get('cart');
    $cart = new Cart($oldCart);
    $cart->addCart($pork, $id);
    $request->session()->put('cart', $cart);

    return redirect()->route('user.index', compact('pork'));

}

Answer 3

@if(isset(Session::get('cart')->items))
@foreach(Session::get('cart')->items as $crt)
@foreach($crt['item'] as $pork)
        <dl class="dl-horizontal">
            <div id="cartdiv">  
              <dt>
               <div>
                 <input type="number" min="1" value="{{$crt['qty']}}">

               </dt>
              <dd>
                <label>
                <b>&nbsp;&nbsp;{{$pork['pork_name']}}</b>
                </label>
               </dd>
                 <dt>
                <label"> Price: <b id="bprice"  name="price">{{$pork['basePrice']}}</b></label>
                </dt>
                 <dd>
                <label>Total Amount: 200.00</label>
                </dd>
              </dt>
          </div>
      </dl>
@endforeach
@endforeach
 @endif

That's my blade view