PHP error: Undefined property: Illuminate\Database\Eloquent\Collection::$retails

Hello I'm trying get my objects on laravel like this.

But I'm getting this error.

PHP error:  Undefined property: Illuminate\Database\Eloquent\Collection::$retails on line 18

Also this is my code.

public function index(){
        $retails = Auth::user()->companies->retails->all();


        return view('retails/retails', compact('retails'));
    }

Company Model

class Company extends Model
{
    public function retails(){
        $this->hasMany(Retail::class);
    }
}

Retail Model

class Retail extends Model
{
    public function company(){
    return $this->belongsTo(Company::class);
    }
}

via Chebli Mohamed