added php sandbox and some helper funcs to models

app/Models/User.php

@@ -109,4 +109,26 @@ class User extends Authenticatable
     {
         return $this->hasMany(Notification::class, 'actor_id');
     }
+
+    // --------- Relation Helpers ---------
+
+    public function addFavourite(Table $table)
+    {
+        $this->favouriteTables()->attach($table);
+    }
+
+    public function removeFavourite(Table $table)
+    {
+        $this->favouriteTables()->detach($table);
+    }
+
+    public function followDiscussion(Table $table)
+    {
+        $this->followedDiscussions()->attach($table);
+    }
+
+    public function unfollowDiscussion(Table $table)
+    {
+        $this->followedDiscussions()->detach($table);
+    }
 }