Laravel 5.6 helper class

The model name is not enough for Laravel to retrieve the right class, it needs the namespace too.

You can try this if all your models are in the App\Modelsnamespace :

public static function getAll($modelName)
{
    $modelName = '\App\Models\' . $modelName;
    return $modelName::all();
}

But if it is not the cas, you should send the whole name to your helper method like that :

Helper::getAll(\App\Models\User::class);
Helper::getAll(\App\Models\Subfolder\OtherModel::class);
// ...

Let me know if it helped you :)

You need to add namespace.

<?php

namespace App\Helpers; // <--- Add this

class Helper{
...

try this.
first import the Model namespace like this

use Illuminate\Database\Eloquent\Model;

then, add Model keyword before $model. like

public function getAll(Model $model){ // your code }

may it can help :)