Undefined property: App\Http\Controllers\PermissionController::$permission - php

Question

there is my controller
<?php
namespace App\Http\Controllers;
use Illuminate\Http\Request;
use Spatie\Permission\Models\Permission;
class PermissionController extends Controller
{
/**
* Display a listing of the resource.
*
* #return \Illuminate\Http\Response
*/
public function _construct(Permission $permission)
{
$this->permission = $permission ;
$this-> middleware("auth") ;
}
public function index()
{
$permissions = $this->permission::all();
return view("permission.index", ['permissions' => $permissions]);
}
public function getAllPermissions(){
$permissions = $this->permission::all();
return response()->json([
'permissions' => $permissions
], 200);
}
/**
* Show the form for creating a new resource.
*
* #return \Illuminate\Http\Response
*/
public function create()
{
//
}
/**
* Store a newly created resource in storage.
*
* #param \Illuminate\Http\Request $request
* #return \Illuminate\Http\Response
*/
public function store(Request $request)
{
//
}
/**
* Display the specified resource.
*
* #param int $id
* #return \Illuminate\Http\Response
*/
public function show($id)
{
//
}
/**
* Show the form for editing the specified resource.
*
* #param int $id
* #return \Illuminate\Http\Response
*/
public function edit($id)
{
//
}
/**
* Update the specified resource in storage.
*
* #param \Illuminate\Http\Request $request
* #param int $id
* #return \Illuminate\Http\Response
*/
public function update(Request $request, $id)
{
//
}
/**
* Remove the specified resource from storage.
*
* #param int $id
* #return \Illuminate\Http\Response
*/
public function destroy($id)
{
//
}
}

Answer 1

Your _construct is missing one underscore. It should be __construct.
In your code, the class property $permission was supposed to be set by the constructor, but since you mistyped it, it never happened. That is why you get the undefined property error