Fixes mapping for Traversable objects in IterableExtractor.

src/Internal/Extractors/IterableExtractor.php

@@ -14,6 +14,10 @@ public function __construct(private ReflectionExtractor $extractor)
 
     public function extract(object $object): array
     {
+        if ($object instanceof Traversable) {
+            return iterator_to_array($object);
+        }
+
         $properties = $this->extractor->extractProperties(object: $object);
 
         $candidates = array_filter(

tests/CollectionMappingTest.php

@@ -17,6 +17,9 @@
 use Test\TinyBlocks\Mapper\Models\Description;
 use Test\TinyBlocks\Mapper\Models\Employee;
 use Test\TinyBlocks\Mapper\Models\Employees;
+use Test\TinyBlocks\Mapper\Models\Invoice;
+use Test\TinyBlocks\Mapper\Models\Invoices;
+use Test\TinyBlocks\Mapper\Models\InvoiceSummaries;
 use Test\TinyBlocks\Mapper\Models\Member;
 use Test\TinyBlocks\Mapper\Models\MemberId;
 use Test\TinyBlocks\Mapper\Models\Members;
@@ -89,6 +92,30 @@ public function testCollectionOfScalars(): void
         self::assertSame('mixed', $attributes->getType());
     }
 
+    public function testCollectionOfTraversable(): void
+    {
+        /** @Given an InvoiceSummaries collection with traversable invoices */
+        $invoiceSummaries = InvoiceSummaries::createFrom(
+            invoices: Invoices::createFrom(elements: [
+                new Invoice(id: 'INV001', amount: 100.0, customer: 'Customer A'),
+                new Invoice(id: 'INV002', amount: 150.5, customer: 'Customer B'),
+                new Invoice(id: 'INV003', amount: 200.75, customer: 'Customer C')
+            ])
+        );
+
+        /** @When mapping the InvoiceSummaries collection to an array */
+        $actual = $invoiceSummaries->toArray();
+
+        /** @Then the mapped array should have expected values */
+        $expected = [
+            'INV001' => ['id' => 'INV001', 'amount' => 100.0, 'customer' => 'Customer A'],
+            'INV002' => ['id' => 'INV002', 'amount' => 150.5, 'customer' => 'Customer B'],
+            'INV003' => ['id' => 'INV003', 'amount' => 200.75, 'customer' => 'Customer C']
+        ];
+
+        self::assertSame($expected, $actual);
+    }
+
     #[DataProvider('collectionDiscardKeysProvider')]
     public function testCollectionDiscardKeys(IterableMapper $collection, array $expected): void
     {

tests/Models/Invoice.php

@@ -0,0 +1,12 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Test\TinyBlocks\Mapper\Models;
+
+final readonly class Invoice
+{
+    public function __construct(public string $id, public float $amount, public string $customer)
+    {
+    }
+}

tests/Models/InvoiceSummaries.php

@@ -0,0 +1,31 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Test\TinyBlocks\Mapper\Models;
+
+use IteratorAggregate;
+use TinyBlocks\Mapper\IterableMappability;
+use TinyBlocks\Mapper\IterableMapper;
+use Traversable;
+
+final class InvoiceSummaries implements IterableMapper, IteratorAggregate
+{
+    use IterableMappability;
+
+    private function __construct(private readonly Invoices $invoices)
+    {
+    }
+
+    public static function createFrom(Invoices $invoices): InvoiceSummaries
+    {
+        return new InvoiceSummaries(invoices: $invoices);
+    }
+
+    public function getIterator(): Traversable
+    {
+        foreach ($this->invoices as $invoice) {
+            yield $invoice->id => $invoice;
+        }
+    }
+}

tests/Models/Invoices.php

@@ -0,0 +1,29 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Test\TinyBlocks\Mapper\Models;
+
+use IteratorAggregate;
+use TinyBlocks\Mapper\IterableMappability;
+use TinyBlocks\Mapper\IterableMapper;
+use Traversable;
+
+final class Invoices implements IterableMapper, IteratorAggregate
+{
+    use IterableMappability;
+
+    public function __construct(public array $elements)
+    {
+    }
+
+    public static function createFrom(array $elements): Invoices
+    {
+        return new Invoices(elements: $elements);
+    }
+
+    public function getIterator(): Traversable
+    {
+        return yield from $this->elements;
+    }
+}