añadir nuevas funcionalidades

app/Models/DocumentComment.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class DocumentComment extends Model
+{
+    protected $fillable = ['content', 'page', 'x', 'y', 'parent_id'];
+    
+    public function user() {
+        return $this->belongsTo(User::class);
+    }
+    
+    public function children() {
+        return $this->hasMany(DocumentComment::class, 'parent_id');
+    }
+    
+    public function parent() {
+        return $this->belongsTo(DocumentComment::class, 'parent_id');
+    }
+}