Merge pull request #48 from magento/issue_20

Include 'products' in category query

app/code/Magento/CatalogGraphQl/Model/Resolver/Category/Products.php

@@ -0,0 +1,107 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\CatalogGraphQl\Model\Resolver\Category;
+
+use Magento\Catalog\Api\ProductRepositoryInterface;
+use Magento\Framework\GraphQl\Config\Element\Field;
+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;
+use Magento\Framework\GraphQl\Query\Resolver\Argument\SearchCriteria\Builder;
+use Magento\CatalogGraphQl\Model\Resolver\Products\Query\Filter;
+use Magento\Framework\GraphQl\Exception\GraphQlInputException;
+
+/**
+ * Category products resolver, used by GraphQL endpoints to retrieve products assigned to a category
+ */
+class Products implements ResolverInterface
+{
+    /** @var \Magento\Catalog\Api\ProductRepositoryInterface */
+    private $productRepository;
+
+    /** @var Builder */
+    private $searchCriteriaBuilder;
+
+    /** @var Filter */
+    private $filterQuery;
+
+    /** @var ValueFactory */
+    private $valueFactory;
+
+    /**
+     * @param ProductRepositoryInterface $productRepository
+     * @param Builder $searchCriteriaBuilder
+     * @param Filter $filterQuery
+     * @param ValueFactory $valueFactory
+     */
+    public function __construct(
+        ProductRepositoryInterface $productRepository,
+        Builder $searchCriteriaBuilder,
+        Filter $filterQuery,
+        ValueFactory $valueFactory
+    ) {
+        $this->productRepository = $productRepository;
+        $this->searchCriteriaBuilder = $searchCriteriaBuilder;
+        $this->filterQuery = $filterQuery;
+        $this->valueFactory = $valueFactory;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function resolve(
+        Field $field,
+        $context,
+        ResolveInfo $info,
+        array $value = null,
+        array $args = null
+    ): Value {
+        $args['filter'] = [
+            'category_ids' => [
+                'eq' => $value['id']
+            ]
+        ];
+        $searchCriteria = $this->searchCriteriaBuilder->build($field->getName(), $args);
+        $searchCriteria->setCurrentPage($args['currentPage']);
+        $searchCriteria->setPageSize($args['pageSize']);
+        $searchResult = $this->filterQuery->getResult($searchCriteria, $info);
+
+        //possible division by 0
+        if ($searchCriteria->getPageSize()) {
+            $maxPages = ceil($searchResult->getTotalCount() / $searchCriteria->getPageSize());
+        } else {
+            $maxPages = 0;
+        }
+
+        $currentPage = $searchCriteria->getCurrentPage();
+        if ($searchCriteria->getCurrentPage() > $maxPages && $searchResult->getTotalCount() > 0) {
+            $currentPage = new GraphQlInputException(
+                __(
+                    'currentPage value %1 specified is greater than the number of pages available.',
+                    [$maxPages]
+                )
+            );
+        }
+
+        $data = [
+            'total_count' => $searchResult->getTotalCount(),
+            'items'       => $searchResult->getProductsSearchResult(),
+            'page_info'   => [
+                'page_size'    => $searchCriteria->getPageSize(),
+                'current_page' => $currentPage
+            ]
+        ];
+
+        $result = function () use ($data) {
+            return $data;
+        };
+
+        return $this->valueFactory->create($result);
+    }
+}

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

@@ -376,6 +376,11 @@ interface CategoryInterface @typeResolver(class: "Magento\\CatalogGraphQl\\Model
     updated_at: String @doc(description: "Timestamp indicating when the category was updated")
     product_count: Int @doc(description: "The number of products in the category")
     default_sort_by: String @doc(description: "The attribute to use for sorting")
+    products(
+        pageSize: Int = 20 @doc(description: "Specifies the maximum number of results to return at once. This attribute is optional."),
+        currentPage: Int = 1 @doc(description: "Specifies which page of results to return. The default value is 1."),
+        sort: ProductSortInput @doc(description: "Specifies which attribute to sort on, and whether to return the results in ascending or descending order.")
+    ): CategoryProducts @doc(description: "The list of products assigned to the category") @resolver(class: "Magento\\CatalogGraphQl\\Model\\Resolver\\Category\\Products")
 }
 
 type CustomizableRadioOption implements CustomizableOptionInterface @doc(description: "CustomizableRadioOption contains information about a set of radio buttons that are defined as part of a customizable option") {
@@ -406,6 +411,12 @@ type Products @doc(description: "The Products object is the top-level object ret
     sort_fields: SortFields @doc(description: "An object that includes the default sort field and all available sort fields") @resolver(class: "Magento\\CatalogGraphQl\\Model\\Resolver\\Category\\SortFields")
 }
 
+type CategoryProducts @doc(description: "The category products object returned in the Category query") {
+    items: [ProductInterface] @doc(description: "An array of products that are assigned to the category")
+    page_info: SearchResultPageInfo @doc(description: "An object that includes the page_info and currentPage values specified in the query")
+    total_count: Int @doc(description: "The number of products returned")
+}
+
 input ProductFilterInput @doc(description: "ProductFilterInput defines the filters to be used in the search. A filter contains at least one attribute, a comparison operator, and the value that is being searched for.") {
     name: FilterTypeInput @doc(description: "The product name. Customers use this name to identify the product.")
     sku: FilterTypeInput @doc(description: "A number or code assigned to a product to identify the product, options, price, and manufacturer")