Can't associate model to one which is creating

[heyiammushu]

Using approach to test my create resource with relation route like here https://laraveljsonapi.io/docs/1.0/testing/resources.html#store-aka-create-testing
But unfortunately model wasn't associated, no error, just null instead of relation? Can you check this, can't figure it out, is it my mistake somewhere or it's a bug.

Worker model

public function schedules()
{
    return $this->hasMany(WorkerSchedule::class);
}

Worker Schedule model

public function worker()
{
    return $this->belongsTo(Worker::class);
}

Worker Schedules schema

public function fields(): array
{
...
    BelongsTo::make('worker'),
...
}

Worker Schedules resource

public function relationships($request): iterable
{
    return [
        $this->relation('worker')
    ];
}

Request inside the test

$response = $this
            ->jsonApi()
            ->expects('worker-schedules')
            ->withData([
                'type' => 'worker-schedules',
                'attributes' => $data,
                'relationships' => [
                    'worker' => [
                        'data' => [
                            'type' => 'workers',
                            'id' => (string) $worker->id,
                        ]
                    ],
                ],
            ])
            ->post('/api/v1/worker-schedules');

Result

Failed asserting that a row in the table [worker_schedules] matches the attributes {
    "id": "84",
    "worker_id": "77",
...
}.

Found similar results: [
    {
        "id": 84,
        "worker_id": null,
...
    }
].

[lindyhopchris]

Have you added a rule for the relationship in the request class? We only fill the model with validated data, so if you don't validate the relationship field it won't be filled.

[lindyhopchris]

Also, this is not correct on the worker schema:

public function worker()
{
    return $this->belongsTo(Worker::class);
}

Not sure what that is (possible incorrect copy and paste?), as this should be used on a schema:
https://laraveljsonapi.io/docs/1.0/schemas/relationships.html#belongs-to

[heyiammushu]

Also, this is not correct on the worker schema:

public function worker()
{
    return $this->belongsTo(Worker::class);
}

Not sure what that is (possible incorrect copy and paste?), as this should be used on a schema:
https://laraveljsonapi.io/docs/1.0/schemas/relationships.html#belongs-to

Yeah, my bad, edited my message with the right one.

[heyiammushu]

Also, this is not correct on the worker schema:

public function worker()
{
    return $this->belongsTo(Worker::class);
}

Not sure what that is (possible incorrect copy and paste?), as this should be used on a schema:
https://laraveljsonapi.io/docs/1.0/schemas/relationships.html#belongs-to

True, forgot about this, everything works now, after I added the relation rule to the request.