ENGCOM-2840: 87 Fetch attribute values and labels for customAttribute…

…Metadata #108

 - Merge Pull Request magento/graphql-ce#108 from magento/graphql-ce:87-Fetch-attribute-values-and-labels-for-customAttributeMetadata
 - Merged commits:
   1. 7674eb1
   2. 4aa808e
   3. 3af924b
   4. a9361b9
   5. b77f96e
   6. a84e6d8

app/code/Magento/EavGraphQl/Model/Resolver/AttributeOptions.php

@@ -0,0 +1,114 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\EavGraphQl\Model\Resolver;
+
+use Magento\EavGraphQl\Model\Resolver\DataProvider\AttributeOptions as AttributeOptionsDataProvider;
+use Magento\Framework\Exception\InputException;
+use Magento\Framework\Exception\StateException;
+use Magento\Framework\GraphQl\Config\Element\Field;
+use Magento\Framework\GraphQl\Exception\GraphQlInputException;
+use Magento\Framework\GraphQl\Exception\GraphQlNoSuchEntityException;
+use Magento\Framework\GraphQl\Query\Resolver\Value;
+use Magento\Framework\GraphQl\Query\Resolver\ValueFactory;
+use Magento\Framework\GraphQl\Query\ResolverInterface;
+use Magento\Framework\GraphQl\Schema\Type\ResolveInfo;
+
+/**
+ * Resolve attribute options data for custom attribute.
+ */
+class AttributeOptions implements ResolverInterface
+{
+    /**
+     * @var AttributeOptionsDataProvider
+     */
+    private $attributeOptionsDataProvider;
+
+    /**
+     * @var AttributeOptions
+     */
+    private $valueFactory;
+
+    /**
+     * @param AttributeOptionsDataProvider $attributeOptionsDataProvider
+     * @param ValueFactory $valueFactory
+     */
+    public function __construct(
+        AttributeOptionsDataProvider $attributeOptionsDataProvider,
+        ValueFactory $valueFactory
+    ) {
+        $this->attributeOptionsDataProvider = $attributeOptionsDataProvider;
+        $this->valueFactory = $valueFactory;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function resolve(
+        Field $field,
+        $context,
+        ResolveInfo $info,
+        array $value = null,
+        array $args = null
+    ) : Value {
+
+        return $this->valueFactory->create(function () use ($value) {
+            $entityType = $this->getEntityType($value);
+            $attributeCode = $this->getAttributeCode($value);
+
+            $optionsData = $this->getAttributeOptionsData($entityType, $attributeCode);
+            return $optionsData;
+        });
+    }
+
+    /**
+     * @param array $value
+     * @return int
+     * @throws GraphQlInputException
+     */
+    private function getEntityType(array $value): int
+    {
+        if (!isset($value['entity_type'])) {
+            throw new GraphQlInputException(__('"Entity type should be specified'));
+        }
+
+        return (int)$value['entity_type'];
+    }
+
+    /**
+     * @param array $value
+     * @return string
+     * @throws GraphQlInputException
+     */
+    private function getAttributeCode(array $value): string
+    {
+        if (!isset($value['attribute_code'])) {
+            throw new GraphQlInputException(__('"Attribute code should be specified'));
+        }
+
+        return $value['attribute_code'];
+    }
+
+    /**
+     * @param int $entityType
+     * @param string $attributeCode
+     * @return array
+     * @throws GraphQlInputException
+     * @throws GraphQlNoSuchEntityException
+     */
+    private function getAttributeOptionsData(int $entityType, string $attributeCode): array
+    {
+        try {
+            $optionsData = $this->attributeOptionsDataProvider->getData($entityType, $attributeCode);
+        } catch (InputException $e) {
+            throw new GraphQlInputException(__($e->getMessage()), $e);
+        } catch (StateException $e) {
+            throw new GraphQlNoSuchEntityException(__($e->getMessage()), $e);
+        }
+        return $optionsData;
+    }
+}

app/code/Magento/EavGraphQl/Model/Resolver/DataProvider/AttributeOptions.php

@@ -0,0 +1,54 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\EavGraphQl\Model\Resolver\DataProvider;
+
+use Magento\Eav\Api\AttributeOptionManagementInterface;
+
+/**
+ * Attribute Options data provider
+ */
+class AttributeOptions
+{
+    /**
+     * @var AttributeOptionManagementInterface
+     */
+    private $optionManager;
+
+    /**
+     * @param AttributeOptionManagementInterface $optionManager
+     */
+    public function __construct(
+        AttributeOptionManagementInterface $optionManager
+    ) {
+        $this->optionManager = $optionManager;
+    }
+
+    /**
+     * @param int $entityType
+     * @param string $attributeCode
+     * @return array
+     */
+    public function getData(int $entityType, string $attributeCode): array
+    {
+        $options = $this->optionManager->getItems($entityType, $attributeCode);
+
+        $optionsData = [];
+        foreach ($options as $option) {
+            // without empty option @see \Magento\Eav\Model\Entity\Attribute\Source\Table::getAllOptions
+            if ($option->getValue() === '') {
+                continue;
+            }
+
+            $optionsData[] = [
+                'label' => $option->getLabel(),
+                'value' => $option->getValue()
+            ];
+        }
+        return $optionsData;
+    }
+}

app/code/Magento/EavGraphQl/composer.json

@@ -4,7 +4,8 @@
     "type": "magento2-module",
     "require": {
         "php": "~7.1.3||~7.2.0",
-        "magento/framework": "*"
+        "magento/framework": "*",
+        "magento/module-eav": "*"
     },
     "suggest": {
         "magento/module-graph-ql": "*"

app/code/Magento/EavGraphQl/etc/schema.graphqls

@@ -13,6 +13,12 @@ type Attribute @doc(description: "Attribute contains the attribute_type of the s
     attribute_code: String @doc(description: "The unique identifier for an attribute code. This value should be in lowercase letters without spaces.")
     entity_type: String @doc(description: "The type of entity that defines the attribute")
     attribute_type: String @doc(description: "The data type of the attribute")
+    attribute_options: [AttributeOption] @resolver(class: "Magento\\EavGraphQl\\Model\\Resolver\\AttributeOptions") @doc(description: "Attribute options list.")
+}
+
+type AttributeOption @doc(description: "Attribute option.") {
+    label: String @doc(description: "Attribute option label.")
+    value: String @doc(description: "Attribute option value.")
 }
 
 input AttributeInput @doc(description: "AttributeInput specifies the attribute_code and entity_type to search") {