Implement a Union return type example

A simple example of a union return type, containing both BlogType as AuthorType.

Author: jerowork

src/Domain/Blog/BlogNotFoundException.php

@@ -0,0 +1,9 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Jerowork\ExampleApplicationGraphqlAttributeSchema\Domain\Blog;
+
+use Exception;
+
+final class BlogNotFoundException extends Exception {}

src/Domain/Blog/BlogRepository.php

@@ -11,6 +11,9 @@
  */
 interface BlogRepository
 {
+    /**
+     * @throws BlogNotFoundException
+     */
     public function getById(string $blogId): Blog;
 
     public function getBlogs(

src/Infrastructure/Api/Http/GraphQL/Resolver/Query/SearchQuery.php

@@ -0,0 +1,36 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Jerowork\ExampleApplicationGraphqlAttributeSchema\Infrastructure\Api\Http\GraphQL\Resolver\Query;
+
+use Jerowork\ExampleApplicationGraphqlAttributeSchema\Domain\Author\AuthorRepository;
+use Jerowork\ExampleApplicationGraphqlAttributeSchema\Domain\Blog\BlogNotFoundException;
+use Jerowork\ExampleApplicationGraphqlAttributeSchema\Domain\Blog\BlogRepository;
+use Jerowork\ExampleApplicationGraphqlAttributeSchema\Infrastructure\Api\Http\GraphQL\Type\AuthorType;
+use Jerowork\ExampleApplicationGraphqlAttributeSchema\Infrastructure\Api\Http\GraphQL\Type\BlogType;
+use Jerowork\GraphqlAttributeSchema\Attribute\Query;
+use Symfony\Component\DependencyInjection\Attribute\Autoconfigure;
+
+#[Autoconfigure(public: true)]
+final readonly class SearchQuery
+{
+    public function __construct(
+        private BlogRepository $blogRepository,
+        private AuthorRepository $authorRepository,
+    ) {}
+
+    #[Query(description: 'Search for an author or blog')]
+    public function search(string $id): AuthorType|BlogType
+    {
+        try {
+            $blog = $this->blogRepository->getById($id);
+
+            return new BlogType($blog);
+        } catch (BlogNotFoundException) {
+            $author = $this->authorRepository->getById($id);
+
+            return new AuthorType($author);
+        }
+    }
+}

src/Infrastructure/Persistence/Blog/SQLite/SQLiteBlogRepository.php

@@ -5,6 +5,7 @@
 namespace Jerowork\ExampleApplicationGraphqlAttributeSchema\Infrastructure\Persistence\Blog\SQLite;
 
 use Jerowork\ExampleApplicationGraphqlAttributeSchema\Domain\Blog\Blog;
+use Jerowork\ExampleApplicationGraphqlAttributeSchema\Domain\Blog\BlogNotFoundException;
 use Jerowork\ExampleApplicationGraphqlAttributeSchema\Domain\Blog\BlogRepository;
 use Jerowork\ExampleApplicationGraphqlAttributeSchema\Domain\Blog\Blogs;
 use Jerowork\ExampleApplicationGraphqlAttributeSchema\Domain\Blog\BlogStatus;
@@ -55,6 +56,10 @@ public function getById(string $blogId): Blog
         /** @var BlogRowPayload $row */
         $row = $result->fetchArray(SQLITE3_ASSOC);
 
+        if (!$row) {
+            throw new BlogNotFoundException('Blog not found');
+        }
+
         return SQLiteBlogFactory::createFromRow($row);
     }