在Laravel5.6应用程序中，我将表名设置为vehicles，然后我需要更新vehiclecontroller update函数中的一些表值，如下所示，

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

        $vehicle = Vehicle::find($id);

        $vehicle->provincename = $request->input('provincename');
        $vehicle->districtname = $request->input('districtname');
        $vehicle->townname = $request->input('townname');
        $vehicle->brandname = $request->input('brandname');
        $vehicle->modelname = $request->input('modelname');
        $vehicle->modelyear = $request->input('year');
        $vehicle->condition = $request->input('condition');
        $vehicle->milage = $request->input('milage');
        $vehicle->detail = $request->input('data');
        $vehicle->price = $request->input('price');
        $vehicle->telephone = $request->input('telephone');
        $vehicle->categoryname =  $request->input('categoryname');
        $vehicle->transmission = $request->input('transmission');
        $vehicle->fueltype = $request->input('fueltype');
        $vehicle->enginecapacity = $request->input('enginecapacity');
        $vehicle->user_id = Auth::user()->id;

        $vehicle->save();

编辑表单动作是，

<form  method="post"  action="{{ route('vehicles.edit', [$vehicles->id])  }}" enctype="multipart/form-data">

更新路线是，

Route::post('myads/{id}', [
    'uses' => '\App\Http\Controllers\VehicleController@update',
])->name('vehicles.edit');

和控制器编辑功能，

public function edit($id)
    {
       $vehicles = Vehicle::findOrFail($id);
}

编辑路线是，

Route::get('myads/{id}/edit', [
    'uses' => '\App\Http\Controllers\VehicleController@edit',
    'as'=> 'vehicles.edit'
]);

但当我点击更新按钮时，它并没有更新值。此处未发生任何错误，仅重定向回编辑窗体。如何解决这个问题？
车辆型号

class Vehicle extends Model
{
    use Searchable;
     protected $guarded = [];

    public function searchableAs()
    {
        return 'categoryname';
    }

     public function category()
    {
        return $this->belongsTo(Category::class);
    }

    public function uploads()
    {
        return $this->hasMany(Upload::class);
    }

     public function cars()
    {
        return $this->hasMany(Car::class);
    }

    public function vans()
    {
        return $this->hasMany(Car::class);
    }

     public function scopePersonal($query)
{
     return $query->where('user_id', Auth::user()->id);

}
}

编辑表单是，

<form  method="post"  action="{{ route('vehicles.edit', [$vehicles->id])  }}" enctype="multipart/form-data">
                {{csrf_field()}}
                <div class="form-group{{ $errors->has('provincename') ? ' has-error' : '' }}">
            <label for="exampleFormControlSelect1">Province</label>
        <select name="provincename" id="provincename" class="form-control input dynamic" data-dependent="districtname" >
            <option value="{{$vehicles->provincename}}">{!! $vehicles->provincename !!}</option>
            @foreach($town_list as $town)

            <option value="{{$town->provincename}}">{{$town->provincename}}</option>
            @endforeach
        </select>
         @if ($errors->has('provincename'))
                    <span class="help-block">{{ $errors->first('provincename') }}</span>
                @endif
        </div>

        <div class="form-group{{ $errors->has('districtname') ? ' has-error' : '' }}">
            <label for="exampleFormControlSelect1">District</label>
           <select name="districtname" id="districtname" class="form-control input dynamic" data-dependent="townname" >
            <option value="{{$vehicles->districtname}}">{!! $vehicles->districtname !!}</option>

        </select>
         @if ($errors->has('districtname'))
                    <span class="help-block">{{ $errors->first('districtname') }}</span>
                @endif
        </div>

        <div class="form-group{{ $errors->has('townname') ? ' has-error' : '' }}">
            <label for="exampleFormControlSelect1">Town</label>
        <select name="townname" id="townname" class="form-control input">
            <option value="{{$vehicles->townname}}">{!! $vehicles->townname !!}</option>

        </select>
        @if ($errors->has('townname'))
                    <span class="help-block">{{ $errors->first('townname') }}</span>
                @endif

        </div>

         <!--hidden select box-->

            <div class="form-group" style="display: none;">
            <label for="exampleFormControlSelect1">Vehicle Category</label>
        <select name="categoryname" id="categoryname" class="form-control input dynamic" data-dependent="brandname" >

            @foreach($model_list as $model) 
            <option value="{{$vehicles->categoryname}}">{{$vehicles->categoryname}}</option>
            @endforeach

        </select>
    </div>

     <div class="form-group{{ $errors->has('brandname') ? ' has-error' : '' }}">
            <label for="exampleFormControlSelect1">Brand</label>

           <select name="brandname" id="brandname" class="form-control input dynamic" data-dependent="modelname" >
            <option value="{{$vehicles->brandname}}">{!! $vehicles->brandname !!}</option>

        </select>
        @if ($errors->has('brandname'))
                    <span class="help-block">{{ $errors->first('brandname') }}</span>
                @endif
        </div>

        <div class="form-group{{ $errors->has('modelname') ? ' has-error' : '' }}">
            <label for="exampleFormControlSelect1">Model</label>
        <select name="modelname" id="modelname" class="form-control input">
            <option value="{{$vehicles->modelname}}">{!! $vehicles->modelname !!}</option>

        </select>
        @if ($errors->has('modelname'))
                    <span class="help-block">{{ $errors->first('modelname') }}</span>
                @endif

        </div>

        <div class="form-group{{ $errors->has('year') ? ' has-error' : '' }}">
        <label for="formGroupExampleInput">Model Year</label>
        <input type="text" class="form-control" id="year" placeholder="Year" name="year" value="{!! $vehicles->modelyear ?: '' !!}">
        @if ($errors->has('year'))
                    <span class="help-block">{{ $errors->first('year') }}</span>
                @endif
        </div>

        <div class="form-group{{ $errors->has('condition') ? ' has-error' : '' }}">
        <label for="formGroupExampleInput">Condition</label>

        <label class="radio-inline"><input type="radio" name="condition" value="used" @if($vehicles->condition == 'used') checked @endif>Used</label>
<label class="radio-inline"><input type="radio" name="condition" value="recondition" @if($vehicles->condition == 'recondition') checked @endif>Recondition</label>
<label class="radio-inline"><input type="radio" name="condition" value="new" @if($vehicles->condition == 'new') checked @endif> New</label>
  @if ($errors->has('condition'))
                    <span class="help-block">{{ $errors->first('condition') }}</span>
                @endif
        </div>

        <div class="form-group{{ $errors->has('milage') ? ' has-error' : '' }}">
        <label for="formGroupExampleInput">Milage</label>
        <input type="text" class="form-control" id="milage" placeholder="Milage" name="milage" value="{!! $vehicles->milage ?: '' !!}">
        @if ($errors->has('milage'))
                    <span class="help-block">{{ $errors->first('milage') }}</span>
                @endif
        </div>

        <div class="form-group{{ $errors->has('transmission') ? ' has-error' : '' }}">
        <label for="exampleFormControlSelect1">Transmission</label>
        <select class="form-control" id="transmission" name="transmission">

            <option value="{!! $vehicles->transmission  !!}">{!! $vehicles->transmission  !!}</option>

        <option value="Manual">Manual</option>
        <option value="Auto">Auto</option>
        <option value="Hybrid">Hybrid</option>
        <option value="Electric">Electric</option>
        <option value="Codak">codak</option>
        </select>
        @if ($errors->has('transmission'))
                    <span class="help-block">{{ $errors->first('transmission') }}</span>
                @endif
        </div> 

        <div class="form-group{{ $errors->has('fueltype') ? ' has-error' : '' }}">
        <label for="exampleFormControlSelect1">Fuel Type</label>
        <select class="form-control" id="fueltype" name="fueltype">

            <option value="{!! $vehicles->fueltype  !!}">{!! $vehicles->fueltype  !!}</option>

        <option value="Petrol">Petrol</option>
        <option value="Diesel">Diesel</option>
        <option value="Hybrid">Hybrid</option>
        <option value="Electric">Electric</option>

        </select>
         @if ($errors->has('fueltype'))
                    <span class="help-block">{{ $errors->first('fueltype') }}</span>
                @endif
        </div> 

        <div class="form-group{{ $errors->has('enginecapacity') ? ' has-error' : '' }}">
        <label for="formGroupExampleInput">Engine capacity</label>

        <input type="text" class="form-control" id="enginecapacity" placeholder="Engine capacity" name="enginecapacity"  value="{!! $vehicles->enginecapacity ?: '' !!}" >
         @if ($errors->has('enginecapacity'))
                    <span class="help-block">{{ $errors->first('enginecapacity') }}</span>
                @endif

        </div>

        <div class="form-group{{ $errors->has('data') ? ' has-error' : '' }}">
        <label for="comment">More Details</label>
        <textarea class="form-control" rows="5" id="data" name="data" rows="10" cols="10">{!! trim($vehicles->detail) !!}</textarea>
        @if ($errors->has('data'))
                    <span class="help-block">{{ $errors->first('data') }}</span>
                @endif
        </div >

        <div class="form-group{{ $errors->has('price') ? ' has-error' : '' }}">
        <label for="formGroupExampleInput">Price</label>
        <input type="text" class="form-control" id="price" placeholder="Price" name="price" value="{!! $vehicles->price ?: '' !!}">
         @if ($errors->has('price'))
                    <span class="help-block">{{ $errors->first('price') }}</span>
                @endif
        </div>

        <div class="form-group{{ $errors->has('telephone') ? ' has-error' : '' }}">
        <label for="formGroupExampleInput">Telephone</label>
        <input type="text" class="form-control" id="telephone" placeholder="Telephone" name="telephone" value="{!! $vehicles->telephone ?: '' !!}" >
         @if ($errors->has('telephone'))
                    <span class="help-block">{{ $errors->first('telephone') }}</span>
                @endif
        </div>

 <!-- <button type="submit" class="btn btn-primary" style="margin-top:10px">Submit</button>
        </div> -->

        @if( $vehicles->uploads->count() > 0 )

                            @php
                                $upload = $vehicles->uploads->sortByDesc('id')->first();
                            @endphp
                           <!--  <img id="preview" src="/images/{{ $upload->resized_name }}"> -->

                   <!--edit/delete buttons-->
@foreach( $vehicles-> uploads as $upload)

                    <img id="preview"
                         src="{{asset((isset($upload) && $upload->resized_name!='')?'images/'.$upload->resized_name:'images/noimage.png')}}"
                         height="200px" width="200px"/>
                    <input class="form-control" style="display:none" name="files[]" type="file" id="files" name="_token" value="{{ csrf_token() }}" enctype="multipart/form-data">
                    <br/>
                    <!-- <a href="javascript:changeProfile();">Add Image</a> | -->
                    <!-- <a style="color: red" href="javascript:removeImage()">Delete</a>
                    <input type="hidden" style="display: none" value="0" name="remove" id="remove"> -->
               <a href="/myads/{{$upload->id}}/editimage">Edit Image</a>|

               <a class="button is-outlined" href="/myads/{{$upload->id}}/delete" onclick="return confirm('Are you sure to want to delete this record?')" >Delete</a></td>

                   <hr>
                   @endforeach
                    @endif

              <button type="submit" class="btn btn-primary" style="margin-top:10px">Submit</button>
        </div>