Why can't link tables in Laravel?

Question

Laravel

controller:

public function getMyInvest() {
        $myInvest = Invest::->where('user_id', Session::get('id_user'))->get();

        return view('invest.my-invest', ['invests' => $myInvest]);
    }

Output in view:

@foreach($invests as $invest)
        <tr>
            <th scope="row">{{$invest->id}}</th>
            <td>{{$invest->tarif_id->name}}</td>
            <td>{{$invest->created_at}} - 16.03.18</td>
            <td>{{$invest->sum}}руб.</td>
            <td><a class="glyphicon icon-remove" href="" > </a></td>
        </tr>
        @endforeach

And the model itself:

class Invest extends Model
{
    public $timestamps = false;

    public function tarif_id() {
        return $this->hasOne('App\Models\Invest_tarif', 'id');
    }
}

What is the reason for the error

Answer 1

The error is obvious if you even try to read the documentation: follow the codestyle
(tarif_id -> tariff, Invest_tarif -> InvestTariff) and everything will work for you.
It's also interesting how you try to use the created_at field if timestamps are disabled ..
PS: is there a new operator in php ::->?))