update

app/Models/Comment.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace App\Models;
+
+use MongoDB\Laravel\Eloquent\Model;
+use MongoDB\Laravel\Eloquent\SoftDeletes;
+use MongoDB\Laravel\Relations\BelongsTo;
+
+class Comment extends Model
+{
+	use SoftDeletes;
+
+    protected $fillable = [ 'message' ];
+
+	public function post(): BelongsTo
+	{
+		return $this->belongsTo(Post::class);
+	}
+
+	public function user(): BelongsTo
+	{
+		return $this->belongsTo(User::class);
+	}
+}