Add JsonApi resource and collection for empty result

src/jsonApi/EmptyCollectionDocument.php

@@ -0,0 +1,36 @@
+<?php
+declare(strict_types=1);
+
+namespace hiapi\jsonApi;
+
+use WoohooLabs\Yin\JsonApi\Schema\Document\AbstractCollectionDocument;
+use WoohooLabs\Yin\JsonApi\Schema\JsonApiObject;
+use WoohooLabs\Yin\JsonApi\Schema\Link\DocumentLinks;
+
+/**
+ * Empty collection to return empty array (nothin is found).
+ *
+ * @author Andrii Vasyliev <sol@hiqdev.com>
+ */
+final class EmptyCollectionDocument extends AbstractCollectionDocument
+{
+    public function __construct()
+    {
+        parent::__construct(new EmptyResource);
+    }
+
+    public function getJsonApi(): ?JsonApiObject
+    {
+        return new JsonApiObject('1.1');
+    }
+
+    public function getMeta(): array
+    {
+        return [];
+    }
+
+    public function getLinks(): ?DocumentLinks
+    {
+        return null;
+    }
+}

src/jsonApi/EmptyResource.php

@@ -0,0 +1,45 @@
+<?php
+declare(strict_types=1);
+
+namespace hiapi\jsonApi;
+
+use WoohooLabs\Yin\JsonApi\Schema\Link\ResourceLinks;
+use WoohooLabs\Yin\JsonApi\Schema\Resource\AbstractResource;
+
+final class EmptyResource extends AbstractResource
+{
+    public function getType($entity): string
+    {
+        return 'empty';
+    }
+
+    public function getId($entity): string
+    {
+        return '';
+    }
+
+    public function getMeta($entity): array
+    {
+        return [];
+    }
+
+    public function getLinks($entity): ?ResourceLinks
+    {
+        return null;
+    }
+
+    public function getAttributes($entity): array
+    {
+        return [];
+    }
+
+    public function getDefaultIncludedRelationships($entity): array
+    {
+        return [];
+    }
+
+    public function getRelationships($entity): array
+    {
+        return [];
+    }
+}

src/jsonApi/ResourceFactory.php

@@ -82,6 +82,9 @@ private function findResourceClassByAncestor($class): string
 
     private function getCollection(array $rows): ResourceDocumentInterface
     {
+        if (empty($content)) {
+            return new EmptyCollectionDocument;
+        }
         $class = get_class(reset($rows));
         if (empty($this->collections[$class])) {
             $this->collections[$class] = $this->findCollection($class);