minor #820 [Store] Support string|object for getContent method (paulinevos)

This PR was merged into the main branch.

Discussion
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[Store] Support `string|object` for `getContent` method

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no <!-- please update src/**/CHANGELOG.md files -->
| Docs?         | no <!-- required for new features -->
| License       | MIT

As the Vectorizer currently makes assumptions about having to pass string data to `PlatformInterface::invoke`, when that method can actually take about any sort of input.

`Platform` implementations decide what data types they can handle through their normalizers. Therefore, it should be up to `platform` to handle types and not up to `store` to decide that it should only pass strings.

Commits
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2d5909c Support `string|object` for `getContent` method

Author: chr-hertel

src/store/src/Document/EmbeddableDocumentInterface.php

@@ -15,7 +15,7 @@ interface EmbeddableDocumentInterface
 {
     public function getId(): mixed;
 
-    public function getContent(): string;
+    public function getContent(): string|object;
 
     public function getMetadata(): Metadata;
 }

src/store/src/Document/Vectorizer.php

@@ -14,6 +14,7 @@
 use Psr\Log\LoggerInterface;
 use Psr\Log\NullLogger;
 use Symfony\AI\Platform\Capability;
+use Symfony\AI\Platform\Exception\ExceptionInterface;
 use Symfony\AI\Platform\PlatformInterface;
 use Symfony\AI\Platform\Vector\Vector;
 use Symfony\AI\Store\Exception\RuntimeException;
@@ -75,6 +76,8 @@ private function validateArray(array $values, string $expectedType): void
 
     /**
      * @param array<string, mixed> $options
+     *
+     * @throws ExceptionInterface
      */
     private function vectorizeString(string|\Stringable $string, array $options = []): Vector
     {
@@ -93,14 +96,20 @@ private function vectorizeString(string|\Stringable $string, array $options = []
 
     /**
      * @param array<string, mixed> $options
+     *
+     * @throws ExceptionInterface
      */
     private function vectorizeEmbeddableDocument(EmbeddableDocumentInterface $document, array $options = []): VectorDocument
     {
         $this->logger->debug('Vectorizing embeddable document', ['document_id' => $document->getId()]);
+        $result = $this->platform->invoke($this->model, $document->getContent(), $options);
+        $vectors = $result->asVectors();
 
-        $vector = $this->vectorizeString($document->getContent(), $options);
+        if (!isset($vectors[0])) {
+            throw new RuntimeException('No vector returned for vectorization.');
+        }
 
-        return new VectorDocument($document->getId(), $vector, $document->getMetadata());
+        return new VectorDocument($document->getId(), $vectors[0], $document->getMetadata());
     }
 
     /**