Question

我收到一条错误消息，内容为 “此集合实例上不存在属性[id]。（查看：C：\ newXampp \ htdocs \ testUser \ resources \ views \ Stock \ edit.blade.php）”

这是我的控制器

public class software 
{
    [JsonProperty("softwares")]
    public List<string> name { get; set; }
    public string version { get; set; }
    public string fixVersion { get; set; }
    public string vulnerabilities { get; set; }
}

这是我的路线

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!');

    }

这是我的edit.blade.php

//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');

我已经尝试了一切，但无法解决问题。当我尝试在编辑控制器中回显$ id时，它将显示正确的$ 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，由于正在进行隐式路由模型绑定，因此您已经从route参数接收到与Stock匹配的id模型的实例。当您将变量$id传递给Stock::find($id)时，您将传递一个模型Arrayable。这会导致find变成findMany，以为您正在传递许多ID。由于以下原因，您最终获得了一个收藏夹：

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

$Stock是一个集合，因为将许多传递给了find。我将其调整为仅将$id变量传递给您想要的Stock的视图。

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

您的视图现在将具有一个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

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