<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Comment extends Model
{
    /**
     * Get the owning commentable model.
     */
    public function commentable()
    {
        return $this->morphTo();
    }
}

class Post extends Model
{
    /**
     * Get all of the post's comments.
     */
    public function comments()
    {
        return $this->morphMany('App\Comment', 'commentable');
    }
}

class Video extends Model
{
    /**
     * Get all of the video's comments.
     */
    public function comments()
    {
        return $this->morphMany('App\Comment', 'commentable');
    }
}

$post = App\Post::find(1);

foreach ($post->comments as $comment) {
    //
}

$comment = App\Comment::find(1);

$commentable = $comment->commentable;

public enum CommentType
{
    Article,
    Video,
    Event
}

public class Comment
{
    public int Id { get; set; }
    public string CommentText { get; set; }
    public string User { get; set; }
    public int? TypeId { get; set; }
    public CommentType CommentType { get; set; }
}

public class Comment
{
    public int Id { get; set; }
    public string CommentText { get; set; }
    public string User { get; set; }

    public virtual Article Article { get; set; }
    public int ArticleId { get; set; }
}

public class Article
{
    public int Id { get; set; }
    public string Title { get; set; }
    public string Slug { get; set; }
    public string Description { get; set; }
    
    public virtual ICollection<Article> Articles { get; set; }
}

interface ICommentable
{
    int Id { get; set; }
}

public class Article : ICommentable
{
    public int Id { get; set; }
    public string Title { get; set; }
    public string Slug { get; set; }
    public string Description { get; set; }
    
    [NotMapped]
    public ICollection<Comment> Comments { get; set; }
}

public class Video : ICommentable
{
    public int Id { get; set; }
    public string Url { get; set; }
    public string Description { get; set; }
    
    [NotMapped]
    public ICollection<Comment> Comments { get; set; }
}

public class Event : ICommentable
{
    public int Id { get; set; }
    public string Name { get; set; }
    public DateTimeOffset? Start { get; set; }
    public DateTimeOffset? End { get; set; }
    
    [NotMapped]
    public ICollection<Comment> Comments { get; set; }
}

public class Comment
{
    public int Id { get; set; }
    public string CommentText { get; set; }
    public string User { get; set; }
    public int? TypeId { get; set; }
    public CommentType CommentType { get; set; }

    ICommentable _parent;

    [NotMapped]
    public ICommentable Parent
    {
        get => _parent;
        set
        {
            _parent = value;
            TypeId = value.Id;
            CommentType = (CommentType) Enum.Parse(typeof(CommentType), value.GetType().Name);
        }
    }
}

var article = dbContext.Articles.Find(1);
            
article.Comments = dbContext.Comments
    .Where(c => c.TypeId == article.Id
                && c.CommentType == CommentType.Article)
    .ToList();

foreach (var comment in article.Comments)
    comment.Parent = article;

foreach (var comment in article.Comments)
{
    Console.WriteLine($"{comment.User} - ${comment.CommentText} - {((Article) comment.Parent).Title}");
}