How to print primay key as a string?

I have a table, from an old database, where the primary key is a string. When I print it on the screen, it is printed like an integer. Eg. if the key is 8-001abc, on the screen I have 8.

This is my code: model

protected $table = 'mytable';
public $primaryKey = 'mykey';
public $incrementing = false;
protected $casts = [
    'mykey' => 'string'
];

controller

$item = MyModel::where('somefield', '=', 0)->get();
return view('mymodel.index', compact('item'));

view

@foreach($odl as $rowodl)
   <p></p>
@endforeach

any idea? thank you!

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