如果在Laravel和VueJs应用程序中未添加图像，如何更新记录

为了更新我的post表，我想添加一个验证来检查是否上传了图像。如果没有上传图像，则会上传除图像以外的所有内容，否则表示有图像，即更新

我在控制器中尝试了以下操作：

public function update(Request $request, $id)
{
    if(request('photo')){
        $exploded = explode(',', request('photo'));
        $decoded = base64_decode($exploded[1]);
        if(str_contains($exploded[0], 'jpeg'))
            $extension = 'jpg';
        else
            $extension = 'png';   

        $fileName = str_random().'.'.$extension;
        $path = public_path().'/'.$fileName;
        file_put_contents($path, $decoded);
        $post = Post::findOrFail($id);
        $post->title = request('title');
        $post->description = request('description');
        $post->category_id = request('category_id');
        $post->user_id = Auth::id();
        $post->photo = $fileName;
        $post->save();
    }
    else{
        $post = Post::findOrFail($id);
        $post->title = request('title');
        $post->description = request('description');
        $post->category_id = request('category_id');
        $post->user_id = Auth::id();
        $post->save();         
    }

    return response()->json([
        'post' => $post,
    ], 200);
}

在我的vue文件中，我有以下内容：

editPost(){
  if(this.update_post.photo == ''){
    axios.put('/api/posts/' + this.update_post.id, {
      title: this.update_post.title,
      description: this.update_post.description,
      category_id: this.update_post.category_id
    })
    .then(response => {
        alert('updated');
        this.showPosts();
    })
    .catch(function(error){
      console.log(error);
    });            
  }
  else{
    axios.put('/api/posts/' + this.update_post.id, {
      title: this.update_post.title,
      description: this.update_post.description,
      category_id: this.update_post.category_id,
      photo: this.update_post.photo
    })
    .then(response => {
        alert('updated');
        this.showPosts();
    })
    .catch(function(error){
      console.log(error);
    });             
  }
}

当我尝试更新帖子时，如果没有插入图像，我会收到500个内部服务器错误：

app.js:14233 PUT http://myblog.local/api/posts/52 500 (Internal Server Error)

以下是我在错误日志中看到的一些错误：

[2018-06-27 20:55:48] local.ERROR: Undefined offset: 1 {"userId":11,"email":"sidney@lab.com","exception":"[object] (ErrorException(code: 0): Undefined offset: 1 at C:\\xampp\\htdocs\\sidneyblog\\app\\Http\\Controllers\\AdminPostsController.php:66)
[stacktrace]
#0 C:\\xampp\\htdocs\\sidneyblog\\app\\Http\\Controllers\\AdminPostsController.php(66): Illuminate\\Foundation\\Bootstrap\\HandleExceptions->handleError(8, 'Undefined offse...', 'C:\\\\xampp\\\\htdocs...', 66, Array)
#1 [internal function]: App\\Http\\Controllers\\AdminPostsController->update(Object(Illuminate\\Http\\Request), '53')
#2 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\Routing\\Controller.php(54): call_user_func_array(Array, Array)
#3 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\Routing\\ControllerDispatcher.php(45): Illuminate\\Routing\\Controller->callAction('update', Array)
#4 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\Routing\\Route.php(212): Illuminate\\Routing\\ControllerDispatcher->dispatch(Object(Illuminate\\Routing\\Route), Object(App\\Http\\Controllers\\AdminPostsController), 'update')
#5 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\Routing\\Route.php(169): Illuminate\\Routing\\Route->runController()
#6 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\Routing\\Router.php(665): Illuminate\\Routing\\Route->run()
#7 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\Routing\\Pipeline.php(30): Illuminate\\Routing\\Router->Illuminate\\Routing\\{closure}(Object(Illuminate\\Http\\Request))
#8 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\Routing\\Middleware\\SubstituteBindings.php(41): Illuminate\\Routing\\Pipeline->Illuminate\\Routing\\{closure}(Object(Illuminate\\Http\\Request))
#9 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(151): Illuminate\\Routing\\Middleware\\SubstituteBindings->handle(Object(Illuminate\\Http\\Request), Object(Closure))
#10 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\Routing\\Pipeline.php(53): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request))
#11 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\Foundation\\Http\\Middleware\\VerifyCsrfToken.php(67): Illuminate\\Routing\\Pipeline->Illuminate\\Routing\\{closure}(Object(Illuminate\\Http\\Request))
#12 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(151): Illuminate\\Foundation\\Http\\Middleware\\VerifyCsrfToken->handle(Object(Illuminate\\Http\\Request), Object(Closure))
#13 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\Routing\\Pipeline.php(53): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request))
#14 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\View\\Middleware\\ShareErrorsFromSession.php(49): Illuminate\\Routing\\Pipeline->Illuminate\\Routing\\{closure}(Object(Illuminate\\Http\\Request))
#15 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(151): Illuminate\\View\\Middleware\\ShareErrorsFromSession->handle(Object(Illuminate\\Http\\Request), Object(Closure))
#16 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\Routing\\Pipeline.php(53): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request))
#17 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\Session\\Middleware\\StartSession.php(63): Illuminate\\Routing\\Pipeline->Illuminate\\Routing\\{closure}(Object(Illuminate\\Http\\Request))
#18 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(151): Illuminate\\Session\\Middleware\\StartSession->handle(Object(Illuminate\\Http\\Request), Object(Closure))
#19 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\Routing\\Pipeline.php(53): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request))
#20 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\Cookie\\Middleware\\AddQueuedCookiesToResponse.php(37): Illuminate\\Routing\\Pipeline->Illuminate\\Routing\\{closure}(Object(Illuminate\\Http\\Request))
#21 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(151): Illuminate\\Cookie\\Middleware\\AddQueuedCookiesToResponse->handle(Object(Illuminate\\Http\\Request), Object(Closure))
#22 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\Routing\\Pipeline.php(53): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request))
#23 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\Cookie\\Middleware\\EncryptCookies.php(59): Illuminate\\Routing\\Pipeline->Illuminate\\Routing\\{closure}(Object(Illuminate\\Http\\Request))
#24 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(151): Illuminate\\Cookie\\Middleware\\EncryptCookies->handle(Object(Illuminate\\Http\\Request), Object(Closure))
#25 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\Routing\\Pipeline.php(53): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request))
#26 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(104): Illuminate\\Routing\\Pipeline->Illuminate\\Routing\\{closure}(Object(Illuminate\\Http\\Request))
#27 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\Routing\\Router.php(667): Illuminate\\Pipeline\\Pipeline->then(Object(Closure))
#28 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\Routing\\Router.php(642): Illuminate\\Routing\\Router->runRouteWithinStack(Object(Illuminate\\Routing\\Route), Object(Illuminate\\Http\\Request))
#29 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\Routing\\Router.php(608): Illuminate\\Routing\\Router->runRoute(Object(Illuminate\\Http\\Request), Object(Illuminate\\Routing\\Route))
#30 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\Routing\\Router.php(597): Illuminate\\Routing\\Router->dispatchToRoute(Object(Illuminate\\Http\\Request))
#31 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\Foundation\\Http\\Kernel.php(176): Illuminate\\Routing\\Router->dispatch(Object(Illuminate\\Http\\Request))
#32 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\Routing\\Pipeline.php(30): Illuminate\\Foundation\\Http\\Kernel->Illuminate\\Foundation\\Http\\{closure}(Object(Illuminate\\Http\\Request))
#33 C:\\xampp\\htdocs\\sidneyblog\\vendor\\fideloper\\proxy\\src\\TrustProxies.php(57): Illuminate\\Routing\\Pipeline->Illuminate\\Routing\\{closure}(Object(Illuminate\\Http\\Request))
#34 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(151): Fideloper\\Proxy\\TrustProxies->handle(Object(Illuminate\\Http\\Request), Object(Closure))
#35 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\Routing\\Pipeline.php(53): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request))
#36 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\Foundation\\Http\\Middleware\\TransformsRequest.php(31): Illuminate\\Routing\\Pipeline->Illuminate\\Routing\\{closure}(Object(Illuminate\\Http\\Request))
#37 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(151): Illuminate\\Foundation\\Http\\Middleware\\TransformsRequest->handle(Object(Illuminate\\Http\\Request), Object(Closure))
#38 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\Routing\\Pipeline.php(53): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request))
#39 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\Foundation\\Http\\Middleware\\TransformsRequest.php(31): Illuminate\\Routing\\Pipeline->Illuminate\\Routing\\{closure}(Object(Illuminate\\Http\\Request))
#40 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(151): Illuminate\\Foundation\\Http\\Middleware\\TransformsRequest->handle(Object(Illuminate\\Http\\Request), Object(Closure))
#41 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\Routing\\Pipeline.php(53): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request))
#42 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\Foundation\\Http\\Middleware\\ValidatePostSize.php(27): Illuminate\\Routing\\Pipeline->Illuminate\\Routing\\{closure}(Object(Illuminate\\Http\\Request))
#43 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(151): Illuminate\\Foundation\\Http\\Middleware\\ValidatePostSize->handle(Object(Illuminate\\Http\\Request), Object(Closure))
#44 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\Routing\\Pipeline.php(53): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request))
#45 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\Foundation\\Http\\Middleware\\CheckForMaintenanceMode.php(51): Illuminate\\Routing\\Pipeline->Illuminate\\Routing\\{closure}(Object(Illuminate\\Http\\Request))
#46 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(151): Illuminate\\Foundation\\Http\\Middleware\\CheckForMaintenanceMode->handle(Object(Illuminate\\Http\\Request), Object(Closure))
#47 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\Routing\\Pipeline.php(53): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request))
#48 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(104): Illuminate\\Routing\\Pipeline->Illuminate\\Routing\\{closure}(Object(Illuminate\\Http\\Request))
#49 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\Foundation\\Http\\Kernel.php(151): Illuminate\\Pipeline\\Pipeline->then(Object(Closure))
#50 C:\\xampp\\htdocs\\sidneyblog\\vendor\\laravel\\framework\\src\\Illuminate\\Foundation\\Http\\Kernel.php(116): Illuminate\\Foundation\\Http\\Kernel->sendRequestThroughRouter(Object(Illuminate\\Http\\Request))
#51 C:\\xampp\\htdocs\\sidneyblog\\public\\index.php(55): Illuminate\\Foundation\\Http\\Kernel->handle(Object(Illuminate\\Http\\Request))
#52 {main}
"} 

---

如何修复此问题？

在控制器中，如果（请求（'photo'））条件始终为真

要从请求中删除，请使用

request$request

变量。例如：

对于文件：

$request->file（'photo'）

---

对于其他文本：

$request->input（'description'）
我尝试了控制器逻辑，但仍然看到相同的错误……不过，我的表中的列可以为空。解决方案2并不是精确的逻辑，因为如果已经有一个映像，它将替换为一个空字符串。我想要的是在没有输入图像的情况下保存除图像以外的所有内容…但是您的逻辑表明，如果没有插入图像，表将接收空字符串。您是否可以重新生成错误，然后共享/your project/storage/logs/laravel.logI中的最后几行内容？我刚刚用这些错误更新了我的问题。（最后几行）您添加的行不够。您可以清除laravel.log，然后重新生成错误，然后共享所有的laravel.log。您共享的行只是堆栈跟踪…要从请求获取输入，请使用
$request
变量。例如：对于文件
$request->file（'photo'）；
和
$request->input（'description'）；
用于其他文本