Merge pull request #72 from cycle/collection-selectable-promise

Add Selectable implementation

src/Promise/Collection/CollectionPromise.php

@@ -14,11 +14,13 @@
 use Cycle\ORM\Promise\PromiseInterface;
 use Doctrine\Common\Collections\AbstractLazyCollection;
 use Doctrine\Common\Collections\ArrayCollection;
+use Doctrine\Common\Collections\Criteria;
+use Doctrine\Common\Collections\Selectable;
 
 /**
  * LazyLoading collection build at top of data promise.
  */
-class CollectionPromise extends AbstractLazyCollection implements CollectionPromiseInterface
+class CollectionPromise extends AbstractLazyCollection implements CollectionPromiseInterface, Selectable
 {
     /** @var PromiseInterface */
     protected $promise;
@@ -46,4 +48,14 @@ protected function doInitialize(): void
     {
         $this->collection = new ArrayCollection($this->promise->__resolve());
     }
+
+    /**
+     * @inheritDoc
+     */
+    public function matching(Criteria $criteria)
+    {
+        $this->initialize();
+
+        return $this->collection->matching($criteria);
+    }
 }