Added a singular 'variation' field to ImageFieldValue

```
{
  media {
    images {
      name
      image {
        variation(identifier: small) { uri }
      }
    }
  }
}
```

Author: Bertrand Dunogier

GraphQL/Resolver/ImageFieldResolver.php

@@ -33,7 +33,34 @@ public function __construct(VariationHandler $variationHandler, ContentService $
         $this->variations = $variations;
     }
 
+    public function resolveImageVariations(ImageFieldValue $fieldValue, $args)
+    {
+        list($content, $field) = $this->getImageField($fieldValue);
+
+        $variations = [];
+        foreach ($args['identifier'] as $identifier) {
+            $versionInfo = $this->contentService->loadVersionInfo($content->contentInfo);
+            $variations[] = $this->variationHandler->getVariation($field, $versionInfo, $identifier);
+        }
+
+        return $variations;
+    }
+
     public function resolveImageVariation(ImageFieldValue $fieldValue, $args)
+    {
+        list($content, $field) = $this->getImageField($fieldValue);
+        $versionInfo = $this->contentService->loadVersionInfo($content->contentInfo);
+
+        return $this->variationHandler->getVariation($field, $versionInfo, $args['identifier']);
+    }
+
+    /**
+     * @param ImageFieldValue $fieldValue
+     * @return array
+     * @throws \eZ\Publish\API\Repository\Exceptions\NotFoundException
+     * @throws \eZ\Publish\API\Repository\Exceptions\UnauthorizedException
+     */
+    protected function getImageField(ImageFieldValue $fieldValue): array
     {
         $idArray = explode('-', $fieldValue->imageId);
         if (count($idArray) != 3) {
@@ -61,15 +88,6 @@ public function resolveImageVariation(ImageFieldValue $fieldValue, $args)
             throw new UserError("Image file {$field->value->id} doesn't exist");
         }
 
-        $variations = [];
-        foreach ($args['identifier'] as $identifier) {
-            $variations[] = $this->variationHandler->getVariation(
-                $field,
-                $this->contentService->loadVersionInfo($content->contentInfo),
-                $identifier
-            );
-        }
-
-        return $variations;
+        return array($content, $field);
     }
 }

Resources/config/graphql/Field.types.yml

@@ -101,9 +101,16 @@ ImageFieldValue:
                 type: "[ImageVariation]"
                 args:
                     identifier:
-                        type: "[String]"
+                        type: "[ImageVariationIdentifier]!"
                         description: "One or more variation identifiers."
                 resolve: "@=resolver('ImageVariation', [value.value, args])"
+            variation:
+                type: ImageVariation
+                args:
+                    identifier:
+                        type: ImageVariationIdentifier!
+                        description: "A variation identifier."
+                resolve: "@=resolver('ImageVariation', [value.value, args])"
             html:
                 type: "String"
                 args:

Resources/config/resolvers.yml

@@ -110,6 +110,7 @@ services:
             $contentService: "@ezpublish.siteaccessaware.service.content"
             $variations: "$image_variations$"
         tags:
+            - { name: overblog_graphql.resolver, alias: "ImageVariations", method: "resolveImageVariations" }
             - { name: overblog_graphql.resolver, alias: "ImageVariation", method: "resolveImageVariation" }
 
     BD\EzPlatformGraphQLBundle\GraphQL\Resolver\DateResolver: