cssd-back/app/Models/InputValue.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;

class InputValue extends Model
{
    public $fillable = [
        'value', 'test_result_id', 'input_id', 'option_id'
    ];

    public function input(): BelongsTo
    {
        return $this->belongsTo(Input::class);
    }

    public function test_result(): BelongsTo
    {
        return $this->belongsTo(TestResult::class);
    }

    public function option(): BelongsTo
    {
        return $this->belongsTo(Option::class);
    }
}