Laravel error: Trying to get property 'id' of non-object

Question

我必须从购物车中删除产品，但我遇到以下错误：

Trying to get property 'id' of non-object (View: /home/acer/test/project_basket/basket/resources/views/cart.blade.php).

我也尝试过不同的方式，...删除会话，但我不知道这似乎有点困难，因为我只需要删除一个产品。对于购物车中每个相同的添加产品，我都会创建每次递增 1 的徽章。

cart.blade.php

@foreach($products as $product)
<tr>
   <td><img src="https://via.placeholder.com/400x200/" class="img-cart"></td>
      <td><strong>{{ $product['item']['title'] }}</strong></td>
          <td>
            <form class="form-inline">
                 <input class="form-control" type="text" value="{{ $product['qty'] }}" style="margin-right: 20px" >
                  <!--<button rel="tooltip" class="btn btn-default"><i class="fa fa-pencil"></i></button>-->
                       <form method="POST" action="{{ route('remove.item', $product->id) }}" > 
                             @csrf
                             {{ method_field('DELETE') }}
                             <input type="submit" value="Delete" onclick="return confirm('Are you sure?')" class="btn btn-primary" />
                                    
                       </form>
                     </form>
                   </td>
                  <td>${{ $product['price'] }}</td>
              </tr>
@endforeach

ProductController.php

<?php

namespace App\Http\Controllers;

use App\Cart;
use App\Product;

use Illuminate\Http\Request;
use Session;

class ProductController extends Controller

{
    /**
    *@return \Illuminate\Http\Response
    */
    public function index()
    {
        $products = Product::all();
        return view('home', ['products'=> $products]);
    }

    public function getAddToCart(Request $request, $id) 
    {
        $product = Product::find($id);
        $oldCart = Session::has('cart') ? Session::get('cart') : null;
        $cart = new Cart($oldCart);
        $cart->add($product, $product->id);

        $request->session()->put('cart', $cart);
        return redirect()->route('home');
    }

    public function getCart()
    {
        if (!Session::has('cart')) {
            return view('cart');
        }
        $oldCart = Session::get('cart');
        $cart = new Cart($oldCart);
        return view('cart', ['products' => $cart->items, 'totalPrice' => $cart->totalPrice]);
    }

    /**
     * Remove the specified resource from storage.
     *
     * @param  \App\Product $product
     * @return \Illuminate\Http\Response
     */
    public function destroy(Product $product)
    {
        $product->delete();


        return redirect()->route('cart');
    }
}

路线：

Route::get('/add-cart/{id}', [
          'uses' => 'ProductController@getAddToCart',
          'as' => 'addToCart'
      ]);

Route::get('/cart', [
          'uses' => 'ProductController@getCart',
          'as' => 'shoppingCart'
      ]);



Route::get('/destroy/{id}', [
     'uses' => 'ProductController@destroy',
     'as' => 'remove.item']);

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 add($item, $id)
   {
     $storedItem = ['qty' => 0, 'price' => $item->price, 'item' => $item];

     if ($this->items ) {

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

Answer 1

像下面这样修改你的代码

cart.blade.php

<form method="POST" action="{{ route('remove.item', $product) }}" > 
    @csrf
    {{ method_field('DELETE') }}
    <input type="submit" value="Delete" onclick="return confirm('Are you sure?')" class="btn btn-primary" />
</form>

路线

Route::get('/destroy/{product}', [
     'uses' => 'ProductController@destroy',
     'as' => 'remove.item']);

那么它应该可以解决你的问题

Answer 2

尝试用 $product['id'] 替换 $product->id。所以这一行：

<form method="POST" action="{{ route('remove.item', $product->id) }}" >

对此的更改：

<form method="POST" action="{{ route('remove.item', $product['id']) }}" >

Answer 3

你必须这样使用

<form method="POST" action="{{route('remove.item',['product'=>$product['id']])}}" >

或

<form method="POST" action="{{route('remove.item',['product'=>$product->id])}}" >

Laravel error: Trying to get property 'id' of non-object

Laravel error: Trying to get property 'id' of non-object

php

routes

laravel

laravel-routing