Laravel: Serialization of 'Illuminate\Http\UploadedFile' is not allowed - php

Question

I'm trying to upload an image, store it on disk and add the path to a JSON file that is stored on the database.
every user got a JSON file with all his images like:
{"images": ["/vendors/57/horse-11.png", "/vendors/57/horse-11.png"]}
That JSON file is stored in the database in the 'images' column.
I'm struggling with this issue for days.. I always get following exception:
Serialization of 'Illuminate\Http\UploadedFile' is not allowed
the error occurs in this part of the code from the processImage function:
$image = Image::make($request->file('image'))
->resize(750, null, function ($constraint) {
$constraint->aspectRatio();
})
->encode('png');
I will guide you through the proces:
first the user uploads an image, code:
https://codeshare.io/jGzQ9
secondly, via the routes.php a controller is called:
public function update(User $user, UserHouse $house, UserHouseRequest $request){
$path = $this->processImage($request, $user->id, $house->id);
$jsonstring = $house->images;
array_push($jsonstring['images'], $path);
$house->images = $jsonstring;
$house->save();
return back();
}
private function processImage($request, $userId, $houseId)
{
$path = null;
$number = rand(1, 99);
if ($request->hasFile('image')) {
$image = Image::make($request->file('image'))
->resize(750, null, function ($constraint) {
$constraint->aspectRatio();
})
->encode('png');
$path = "/users/{$userId}/house-{$houseId}-{$number}.png";
Storage::disk('fileadmin')->put($path, $image->encoded);
}
return $path;
}
There is also some JS code, but I think that that isn't necessary for this problem. If it does, I will add it later.
I'm using Laravel 5.5
stacktrace:
2019-05-28 13:30:49] local.ERROR: Serialization of 'Illuminate\Http\UploadedFile' is not allowed {"userId":57,"email":"info#ho.com","exception":"[object] (Exception(code: 0): Serialization of 'Illuminate\\Http\\UploadedFile' is not allowed at /Users/sg/ah-website/user/laravel/framework/src/Illuminate/Session/Store.php:128)
[stacktrace]
#0 /Users/sg/website/user/laravel/framework/src/Illuminate/Session/Store.php(128): serialize(Array)
#1 /Users/sg/website/user/laravel/framework/src/Illuminate/Session/Middleware/StartSession.php(87): Illuminate\\Session\\Store->save()
#2 /Users/sg/website/user/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(218): Illuminate\\Session\\Middleware\\StartSession->terminate(Object(Illuminate\\Http\\Request), Object(Illuminate\\Http\\Response))
#3 /Users/sg/website/user/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(189): Illuminate\\Foundation\\Http\\Kernel->terminateMiddleware(Object(Illuminate\\Http\\Request), Object(Illuminate\\Http\\Response))
#4 /Users/sg/website/public/index.php(60): Illuminate\\Foundation\\Http\\Kernel->terminate(Object(Illuminate\\Http\\Request), Object(Illuminate\\Http\\Response))
#5 /Users/sg/website/server.php(21): require_once('/Users/sg...')
#6 {main}
"}
config/filesystems.php
<?php
return [
/*
|--------------------------------------------------------------------------
| Default Filesystem Disk
|--------------------------------------------------------------------------
|
| Here you may specify the default filesystem disk that should be used
| by the framework. The "local" disk, as well as a variety of cloud
| based disks are available to your application. Just store away!
|
*/
'default' => env('FILESYSTEM_DRIVER', 'local'),
/*
|--------------------------------------------------------------------------
| Default Cloud Filesystem Disk
|--------------------------------------------------------------------------
|
| Many applications store files both locally and in the cloud. For this
| reason, you may specify a default "cloud" driver here. This driver
| will be bound as the Cloud disk implementation in the container.
|
*/
'cloud' => env('FILESYSTEM_CLOUD', 's3'),
/*
|--------------------------------------------------------------------------
| Filesystem Disks
|--------------------------------------------------------------------------
|
| Here you may configure as many filesystem "disks" as you wish, and you
| may even configure multiple disks of the same driver. Defaults have
| been setup for each driver as an example of the required options.
|
| Supported Drivers: "local", "ftp", "s3", "rackspace"
|
*/
'disks' => [
'local' => [
'driver' => 'local',
'root' => storage_path('app'),
],
'public' => [
'driver' => 'local',
'root' => storage_path('app/public'),
'url' => env('APP_URL').'/storage',
'visibility' => 'public',
],
's3' => [
'driver' => 's3',
'key' => env('AWS_KEY'),
'secret' => env('AWS_SECRET'),
'region' => env('AWS_REGION'),
'bucket' => env('AWS_BUCKET'),
],
'fileadmin' => [
'driver' => 'local',
'root' => public_path(),
'visibility' => 'public',
'url' => config('app.url'),
],
],
];