LaravelApp/app/Models/Comment.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\SoftDeletes;

class Comment extends Model
{
    use HasFactory, SoftDeletes;

    protected $fillable = [
        'submission_id',
        'author',
        'content',
    ];

    protected $casts = [
        'created_at' => 'datetime',
        'updated_at' => 'datetime',
        'deleted_at' => 'datetime',
    ];

    // Связь многие-к-одному: комментарий принадлежит заявке
    public function submission()
    {
        return $this->belongsTo(Submission::class);
    }

    // Полиморфная связь: комментарий может иметь вложения
    public function attachments()
    {
        return $this->morphMany(Attachment::class, 'attachable');
    }
}