seed introduction audio child

backend/database/seeders/ElementSeeder.php

@@ -6,6 +6,7 @@ use App\Element\CreateElementDto;
 use App\Element\ElementRepository;
 use App\Set\SetRepository;
 use Illuminate\Database\Seeder;
+use RuntimeException;
 
 class ElementSeeder extends Seeder
 {
@@ -80,8 +81,9 @@ class ElementSeeder extends Seeder
             ],
         ];
 
+        $introductionElement = null;
         foreach ($baderechChildElements as $baderechChildElement) {
-            $elementRepository->create(new CreateElementDto(
+            $createdElement = $elementRepository->create(new CreateElementDto(
                 set: $baderechSet,
                 title: $baderechChildElement['title'],
                 description: $baderechChildElement['description'],
@@ -91,7 +93,27 @@ class ElementSeeder extends Seeder
                 youtubeUrl: null,
                 parentElement: $rootElement,
             ));
+            if ($baderechChildElement['title'] === '1. Introduction') {
+                $introductionElement = $createdElement;
+            }
         }
+
+        if ($introductionElement === null) {
+            throw new RuntimeException('Introduction element was not seeded');
+        }
+
+        $elementRepository->create(new CreateElementDto(
+            set: $baderechSet,
+            title: 'Fundamentals # 1: Living Our Way to a Wholesome '
+                . 'Fulfilled Life (Audio)',
+            description: '',
+            iconImageUrl: null,
+            richText: '',
+            pdfPath: null,
+            youtubeUrl: 'https://www.youtube.com/watch?v='
+                . 'yHx-r4p6hHU&t=1s',
+            parentElement: $introductionElement,
+        ));
     }
 
     private function introductionRichText(): string