eCert-MBIP/app/Models/QuestionnaireResponse.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class QuestionnaireResponse extends Model
{
    protected $fillable = [
        'program_id', 'participant_id', 'questionnaire_set_id',
        'submitted_at', 'ip_address', 'user_agent',
    ];

    protected function casts(): array
    {
        return ['submitted_at' => 'datetime'];
    }

    public function program()
    {
        return $this->belongsTo(Program::class);
    }

    public function participant()
    {
        return $this->belongsTo(Participant::class);
    }

    public function questionnaireSet()
    {
        return $this->belongsTo(QuestionnaireSet::class);
    }

    public function answers()
    {
        return $this->hasMany(QuestionnaireAnswer::class);
    }
}