Laravel 5.8 中的编辑和更新功能

Question

我收到一条错误消息 "Property [id] does not exist on this collection instance. (View: C:\newXampp\htdocs\testUser\resources\views\Stock\edit.blade.php)"

这是我的控制器

public function editStock(Stock $id)
    {
        //
        $Stock = Stock::find($id);
        return view('Stock.edit', compact('Stock', 'id'));
        // return response($stock);

    }

    /**
     * Update the specified resource in storage.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \App\Stock  $stock
     * @return \Illuminate\Http\Response
     */
    public function updateStock(Request $request, $id)
    {
        $request->validate([
            'id'=>'required',
            'stock_name'=>'required',
            'stock_qty'=>'required',
            'stock_unit'=>'required',
            'stock_price_per_kg'=>'required',
            'stock_weight_per_qty'=>'required'
        ]);

        $stock = Stock::find($id);
        $stock->stock_name =  $request->get('stock_name');
        $stock->stock_qty = $request->get('stock_qty');
        $stock->stock_unit = $request->get('stock_unit');
        $stock->stock_price_per_kg = $request->get('stock_price_per_kg');
        $stock->stock_weight_per_qty = $request->get('stock_weight_per_qty');
        $stock->save();

        return redirect('/Stock/index/')->with('success', 'Stock updated!');

    }

这些是我的路线

//Route for Stock
Route::get('/Stock/createStock/', 'ChicController@createStock')->name('createStock');
Route::post('/Stock/createStock/', 'ChicController@storeStock')->name('storeStock');
Route::get('/Stock/index/', 'ChicController@indexStock')->name('indexStock');
Route::get('/Stock/edit/{id}', 'ChicController@editStock')->name('editStock');
Route::post('/Stock/edit/{id}', 'ChicController@updateStock')->name('updateStock');
Route::delete('/Stock/index/{id}', 'ChicController@destroyStock')->name('deleteStock');

这是我的edit.blade.php

@extends('layouts.app')

@section('content')
<div class="row">
    <div class="col-sm-8 offset-sm-2">
        <h1 class="display-3">Update a Stock</h1>

        @if ($errors->any())
        <div class="alert alert-danger">
            <ul>
                @foreach ($errors->all() as $error)
                <li>{{ $error }}</li>
                @endforeach
            </ul>
        </div>
        <br /> 
        @endif
        <form method="post" action="{{ route('updateStock', $Stock->id) }}">
            {{ csrf_field() }}
            <div class="form-group">

                <label for="stock_name">Stock Name:</label>
                <input type="text" class="form-control" name="stock_name" value={{$Stock->stock_name }} />
            </div>

            <div class="form-group">
                <label for="stock_qty">Stock Amount:</label>
                <input type="number" class="form-control" name="stock_qty" value={{$Stock->stock_qty }} />
            </div>

            <div class="form-group">
                <label for="stock_unit">Stock Unit:</label>
                <select id="stock_unit" name="stock_unit" value={{$Stock->stock_unit}}>
                    <option value="Kg">Kg</option>
                    <option value="Qty">Qty</option>
                </select>
            </div>

            <div class="form-group">
                <label for="stock_price_per_kg">Price Per Kg:</label>
                <input type="number" class="form-control" name="stock_price_per_kg" value={{$Stock->stock_price_per_kg }} />
            </div>
            <div class="form-group">
                <label for="stock_weight_per_qty">Weight Per Qty:</label>
                <input type="number" class="form-control" name="stock_weight_per_qty" value={{$Stock->stock_weight_per_qty }} />
            </div>
            <button type="submit" class="btn btn-primary">Update</button>
        </form>
    </div>
</div>
@endsection

我什么都试过了，还是没能解决问题。当我尝试在编辑控制器中回显 $id 时，它显示正确的 $id。因此，我不知道如何解决这个问题，也不知道为什么会这样。

Answer 1

对于您的 editStock 方法，您已经收到一个 Stock 模型的实例，该实例与路由参数中的 id 相匹配，因为正在发生隐式路由模型绑定。当您将 $id 变量传递给 Stock::find($id) 时，您传递的是 Arrayable 模型。这会导致 find 变成 findMany，认为您传递了很多 ID。因为这个你最终得到了一个集合：

public function editStock(Stock $id)
{
    $Stock = Stock::find($id);
    return view('Stock.edit', compact('Stock', 'id'));
}

$Stock 是一个集合，因为将许多传递给 find。我会调整它以仅将 $id 变量传递给您的视图，这是您想要的 Stock。

public function editStock(Stock $id)
{
    return view('Stock.edit', [
        'Stock' => $id,
    ]);
}

您的视图现在将有一个 Stock 变量，它是您想要的 Stock。

Laravel 5.8 Docs - Routing - Route Model Bindings - Implicit Bindings

Laravel 5.8 中的编辑和更新功能

Edit and Update functions in Laravel 5.8

php

laravel

laravel-5.8