我正在特灵访问刀片模板上的路由，因此收到以下错误：

Route \[{$name}\] not defined.

Route::patch('/update_merchant/{merchant_id}', 'MerchantsController@update')->name('update');

刀片模板

<form name="merchants_data" id="merchants_data" method="post" action="{{route('update_merchant.update', [$item->merchant_id])}}">      
    {{ csrf_field() }}    
    {!! method_field('patch') !!}

控制器

public function update(Request $request, $merchant_id)
{
    // Validation for required fields (and using some regex to validate our numeric value)
    $request->validate([
        'fees'=>'required',
    ]); 
    $merchants = Merchants_data::findorfail($merchant_id);
    // Getting values from the blade template form
    $merchants->fees = $request->get('fees');
    $merchants->save();

    return redirect('/manage_merchants')->with('success', 'Transaction Fee updated.'); 
}