If a user chooses a school, and they're the only director at that school, they'll be made head.

app/Http/Controllers/UserController.php

@@ -40,6 +40,12 @@ class UserController extends Controller
             'school_id' => request('school_id'),
         ]);
 
+        $user->refresh();
+
+        if ($user->school->users->count() < 2) {
+            $user->addFlag('head_director');
+        }
+
         return redirect('/my_school');
     }
 }