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✏️ Editing: ProductMapper.php Writable

<?php

declare(strict_types=1);

namespace Automattic\WooCommerce\Api\Utils\Products;

use Automattic\WooCommerce\Api\Enums\Products\ProductStatus;
use Automattic\WooCommerce\Api\Enums\Products\ProductType;
use Automattic\WooCommerce\Api\Enums\Products\StockStatus;
use Automattic\WooCommerce\Api\Pagination\Connection;
use Automattic\WooCommerce\Api\Pagination\Edge;
use Automattic\WooCommerce\Api\Pagination\IdCursorFilter;
use Automattic\WooCommerce\Api\Pagination\PageInfo;
use Automattic\WooCommerce\Api\Pagination\PaginationParams;
use Automattic\WooCommerce\Api\Types\Products\ExternalProduct;
use Automattic\WooCommerce\Api\Types\Products\ProductAttribute;
use Automattic\WooCommerce\Api\Types\Products\ProductDimensions;
use Automattic\WooCommerce\Api\Types\Products\ProductImage;
use Automattic\WooCommerce\Api\Types\Products\ProductReview;
use Automattic\WooCommerce\Api\Types\Products\ProductVariation;
use Automattic\WooCommerce\Api\Types\Products\SelectedAttribute;
use Automattic\WooCommerce\Api\Types\Products\SimpleProduct;
use Automattic\WooCommerce\Api\Types\Products\VariableProduct;

/**
 * Maps a WC_Product to the appropriate product DTO.
 */
class ProductMapper {
	/**
	 * Map a WC_Product to the appropriate product DTO based on its type.
	 *
	 * @param \WC_Product $wc_product The WooCommerce product object.
	 * @param ?array      $query_info Unified query info tree from the GraphQL request.
	 * @return object
	 */
	public static function from_wc_product(
		\WC_Product $wc_product,
		?array $query_info = null,
	): object {
		$product = match ( $wc_product->get_type() ) {
			'external'  => self::build_external_product( $wc_product ),
			'variable'  => self::build_variable_product( $wc_product, $query_info ),
			'variation' => self::build_product_variation( $wc_product ),
			default     => new SimpleProduct(),
		};

self::populate_common_fields( $product, $wc_product, $query_info );

return $product;
	}

/**
	 * Build an ExternalProduct with type-specific fields.
	 *
	 * @param \WC_Product $wc_product The external product.
	 * @return ExternalProduct
	 */
	private static function build_external_product( \WC_Product $wc_product ): ExternalProduct {
		$product = new ExternalProduct();

$url                  = $wc_product->get_product_url();
		$product->product_url = ! empty( $url ) ? $url : null;
		$text                 = $wc_product->get_button_text();
		$product->button_text = ! empty( $text ) ? $text : null;

return $product;
	}

/**
	 * Build a VariableProduct with type-specific fields.
	 *
	 * @param \WC_Product $wc_product The variable product.
	 * @param ?array      $query_info Unified query info tree from the GraphQL request.
	 * @return VariableProduct
	 */
	private static function build_variable_product( \WC_Product $wc_product, ?array $query_info = null ): VariableProduct {
		$product = new VariableProduct();

$child_ids   = $wc_product->get_children();
		$total_count = count( $child_ids );

// Extract the per-variation selection and pagination args from
		// $query_info up front. Narrowing $query_info keeps recursive
		// from_wc_product() calls from fetching subtrees the client didn't
		// request (e.g. reviews for every variation).
		$variations_info      = $query_info['...VariableProduct']['variations']
			?? $query_info['variations']
			?? null;
		$variation_query_info = self::connection_node_info( $variations_info );
		$pagination_args      = $variations_info['__args'] ?? array();

// Slice the ID window *before* mapping: otherwise `variations(first: 1)`
		// on a product with N variations would prime+map all N just to slice
		// the result down afterwards. The resolver-level validation at
		// Connection::slice() is now bypassed (we're building a pre-sliced
		// connection), so call validate_args() explicitly to keep the 0..
		// MAX_PAGE_SIZE bounds enforced.
		PaginationParams::validate_args( $pagination_args );
		$page = self::slice_variation_ids( $child_ids, $pagination_args );

// Prime post + meta caches for only the paged subset.
		if ( ! empty( $page['ids'] ) ) {
			_prime_post_caches( $page['ids'] );
		}

$edges = array();
		$nodes = array();
		foreach ( $page['ids'] as $child_id ) {
			$child_product = wc_get_product( $child_id );
			if ( ! $child_product ) {
				continue;
			}

$variation = self::from_wc_product( $child_product, $variation_query_info );

$edge         = new Edge();
			$edge->cursor = base64_encode( (string) $child_id );
			$edge->node   = $variation;

$edges[] = $edge;
			$nodes[] = $variation;
		}

$page_info                    = new PageInfo();
		$page_info->has_next_page     = $page['has_next_page'];
		$page_info->has_previous_page = $page['has_previous_page'];
		$page_info->start_cursor      = ! empty( $edges ) ? $edges[0]->cursor : null;
		$page_info->end_cursor        = ! empty( $edges ) ? $edges[ count( $edges ) - 1 ]->cursor : null;

// total_count reflects the full variation set, not the paged one —
		// consistent with how the root list resolvers compute it.
		$product->variations = Connection::pre_sliced( $edges, $page_info, $total_count );

return $product;
	}

/**
	 * Compute a Relay cursor page against a list of variation IDs.
	 *
	 * Mirrors the logic in {@see Connection::slice()} but operates on raw
	 * IDs so the caller can page-down *before* calling `wc_get_product()`
	 * + `from_wc_product()` on each child. Returns the paged IDs and the
	 * corresponding `has_next_page` / `has_previous_page` flags in Relay
	 * semantics.
	 *
	 * @param int[] $child_ids  Full variation ID list, in menu_order.
	 * @param array $args       `{first?, last?, after?, before?}` raw GraphQL args.
	 * @return array{ids: int[], has_next_page: bool, has_previous_page: bool}
	 */
	private static function slice_variation_ids( array $child_ids, array $args ): array {
		$first  = $args['first'] ?? null;
		$last   = $args['last'] ?? null;
		$after  = $args['after'] ?? null;
		$before = $args['before'] ?? null;

// No pagination requested — return the full list as-is.
		if ( null === $first && null === $last && null === $after && null === $before ) {
			return array(
				'ids'               => array_values( $child_ids ),
				'has_next_page'     => false,
				'has_previous_page' => false,
			);
		}

// Narrow by `after`: drop IDs up to and including the cursor position.
		if ( null !== $after ) {
			$after_id  = IdCursorFilter::decode_id_cursor( $after, 'after' );
			$idx       = array_search( $after_id, $child_ids, true );
			$child_ids = false !== $idx ? array_slice( $child_ids, $idx + 1 ) : array();
		}

// Narrow by `before`: drop IDs from the cursor position onward.
		if ( null !== $before ) {
			$before_id = IdCursorFilter::decode_id_cursor( $before, 'before' );
			$idx       = array_search( $before_id, $child_ids, true );
			if ( false !== $idx ) {
				$child_ids = array_slice( $child_ids, 0, $idx );
			}
		}

$total_after_cursors = count( $child_ids );

// Apply first/last limits.
		if ( null !== $first && $first >= 0 ) {
			$child_ids = array_slice( $child_ids, 0, $first );
		}
		if ( null !== $last && $last >= 0 ) {
			$child_ids = array_slice( $child_ids, max( 0, count( $child_ids ) - $last ) );
		}

// Relay semantics for the forward / backward branches match what
		// ListProducts / ListCoupons use at the root level.
		return array(
			'ids'               => array_values( $child_ids ),
			'has_next_page'     =>
				null !== $first ? count( $child_ids ) < $total_after_cursors : ( null !== $before ),
			'has_previous_page' =>
				null !== $last ? count( $child_ids ) < $total_after_cursors : ( null !== $after ),
		);
	}

/**
	 * Build a ProductVariation with type-specific fields.
	 *
	 * @param \WC_Product $wc_product The variation product.
	 * @return ProductVariation
	 */
	private static function build_product_variation( \WC_Product $wc_product ): ProductVariation {
		$product            = new ProductVariation();
		$product->parent_id = $wc_product->get_parent_id();

$selected_attributes = array();
		foreach ( $wc_product->get_attributes() as $taxonomy => $value ) {
			$attr       = new SelectedAttribute();
			$attr->name = $taxonomy;

// For taxonomy attributes, resolve the slug to a human-readable term name.
			if ( taxonomy_exists( $taxonomy ) && ! empty( $value ) ) {
				$term = get_term_by( 'slug', $value, $taxonomy );
				if ( $term && ! is_wp_error( $term ) ) {
					$attr->value = $term->name;
				} else {
					$attr->value = $value;
				}
			} else {
				$attr->value = $value;
			}

$selected_attributes[] = $attr;
		}
		$product->selected_attributes = $selected_attributes;

return $product;
	}

/**
	 * Populate the common fields shared by all product types.
	 *
	 * @param object      $product    The product DTO to populate.
	 * @param \WC_Product $wc_product The WooCommerce product object.
	 * @param ?array      $query_info Unified query info tree from the GraphQL request.
	 */
	private static function populate_common_fields(
		object $product,
		\WC_Product $wc_product,
		?array $query_info,
	): void {
		$raw_status       = (string) $wc_product->get_status();
		$raw_product_type = (string) $wc_product->get_type();

$product->id                = $wc_product->get_id();
		$product->name              = $wc_product->get_name();
		$product->slug              = $wc_product->get_slug();
		$sku                        = $wc_product->get_sku();
		$product->sku               = '' !== $sku ? $sku : null;
		$product->description       = $wc_product->get_description();
		$product->short_description = $wc_product->get_short_description();
		$product->status            = ProductStatus::tryFrom( $raw_status ) ?? ProductStatus::Other;
		$product->raw_status        = $raw_status;
		$product->product_type      = ProductType::tryFrom( $raw_product_type ) ?? ProductType::Other;
		$product->raw_product_type  = $raw_product_type;

// Price fields support a "formatted" argument for currency display.
		// An empty stored value means "not set" and is surfaced as null —
		// without this, wc_price( (float) '' ) would render as "$0.00" and
		// be indistinguishable from a genuinely-zero price.
		$format_regular = $query_info['regular_price']['__args']['formatted'] ?? true;
		$raw_regular    = $wc_product->get_regular_price();
		if ( '' === $raw_regular ) {
			$product->regular_price = null;
		} else {
			$product->regular_price = $format_regular
				? wc_price( (float) $raw_regular )
				: $raw_regular;
		}

$format_sale = $query_info['sale_price']['__args']['formatted'] ?? true;
		$raw_sale    = $wc_product->get_sale_price();
		if ( '' === $raw_sale ) {
			$product->sale_price = null;
		} else {
			$product->sale_price = $format_sale
				? wc_price( (float) $raw_sale )
				: $raw_sale;
		}

$raw_stock_status          = (string) $wc_product->get_stock_status();
		$product->stock_status     = self::map_stock_status( $raw_stock_status );
		$product->raw_stock_status = $raw_stock_status;
		$product->stock_quantity   = $wc_product->get_stock_quantity();

// Nested output type: dimensions.
		$product->dimensions = self::build_dimensions( $wc_product );

// Array of objects: images.
		$product->images = self::build_images( $wc_product );

// Array of objects: attributes.
		$product->attributes = self::build_attributes( $wc_product );

// Sub-collection connection: reviews.
		// Only populate if explicitly requested (optimization via $query_info).
		if ( null === $query_info || array_key_exists( 'reviews', $query_info ) ) {
			$product->reviews = self::build_reviews( $wc_product->get_id() );
		} else {
			$product->reviews = self::empty_connection();
		}

$product->date_created  = $wc_product->get_date_created()?->format( \DateTimeInterface::ATOM );
		$product->date_modified = $wc_product->get_date_modified()?->format( \DateTimeInterface::ATOM );

// Ignored field — set to null; it won't appear in the schema.
		$product->internal_notes = null;
	}

/**
	 * Map WooCommerce stock status string to the int-backed StockStatus enum.
	 *
	 * @param string $wc_status The WC stock status string.
	 * @return StockStatus
	 */
	private static function map_stock_status( string $wc_status ): StockStatus {
		return match ( $wc_status ) {
			'instock'     => StockStatus::InStock,
			'outofstock'  => StockStatus::OutOfStock,
			'onbackorder' => StockStatus::OnBackorder,
			default       => StockStatus::Other,
		};
	}

/**
	 * Build product dimensions from a WC_Product.
	 *
	 * @param \WC_Product $wc_product The product.
	 * @return ?ProductDimensions
	 */
	private static function build_dimensions( \WC_Product $wc_product ): ?ProductDimensions {
		$length = $wc_product->get_length();
		$width  = $wc_product->get_width();
		$height = $wc_product->get_height();
		$weight = $wc_product->get_weight();

if ( '' === $length && '' === $width && '' === $height && '' === $weight ) {
			return null;
		}

$dims         = new ProductDimensions();
		$dims->length = '' !== $length ? (float) $length : null;
		$dims->width  = '' !== $width ? (float) $width : null;
		$dims->height = '' !== $height ? (float) $height : null;
		$dims->weight = '' !== $weight ? (float) $weight : null;

return $dims;
	}

/**
	 * Build product images from a WC_Product.
	 *
	 * @param \WC_Product $wc_product The product.
	 * @return ProductImage[]
	 */
	private static function build_images( \WC_Product $wc_product ): array {
		$images   = array();
		$position = 0;

// Include the featured image first.
		$featured_id = $wc_product->get_image_id();
		if ( $featured_id ) {
			$image = self::build_image( (int) $featured_id, $position );
			if ( null !== $image ) {
				$images[] = $image;
				++$position;
			}
		}

// Then gallery images.
		foreach ( $wc_product->get_gallery_image_ids() as $image_id ) {
			$image = self::build_image( (int) $image_id, $position );
			if ( null !== $image ) {
				$images[] = $image;
				++$position;
			}
		}

return $images;
	}

/**
	 * Build product attributes from a WC_Product.
	 *
	 * For variations, attributes are simple key→value pairs (handled by selected_attributes),
	 * so this returns an empty array. For other product types, it returns full attribute definitions.
	 *
	 * @param \WC_Product $wc_product The product.
	 * @return ProductAttribute[]
	 */
	private static function build_attributes( \WC_Product $wc_product ): array {
		// Variations store attributes as simple string values, not WC_Product_Attribute objects.
		if ( 'variation' === $wc_product->get_type() ) {
			return array();
		}

$attributes = array();
		foreach ( $wc_product->get_attributes() as $wc_attr ) {
			if ( ! $wc_attr instanceof \WC_Product_Attribute ) {
				continue;
			}

$attr       = new ProductAttribute();
			$attr->slug = $wc_attr->get_name();

if ( $wc_attr->is_taxonomy() ) {
				$attr->name    = wc_attribute_label( $wc_attr->get_name() );
				$attr->options = array_map(
					function ( $term ) {
						return $term->name;
					},
					$wc_attr->get_terms() ? $wc_attr->get_terms() : array()
				);
			} else {
				$attr->name    = $wc_attr->get_name();
				$attr->options = $wc_attr->get_options();
			}

$attr->position    = $wc_attr->get_position();
			$attr->visible     = $wc_attr->get_visible();
			$attr->variation   = $wc_attr->get_variation();
			$attr->is_taxonomy = $wc_attr->is_taxonomy();

$attributes[] = $attr;
		}//end foreach

return $attributes;
	}

/**
	 * Build a single ProductImage from an attachment ID.
	 *
	 * @param int $attachment_id The WordPress attachment ID.
	 * @param int $position      The display position.
	 * @return ?ProductImage
	 */
	private static function build_image( int $attachment_id, int $position ): ?ProductImage {
		$url = wp_get_attachment_url( $attachment_id );
		if ( ! $url ) {
			return null;
		}

$image           = new ProductImage();
		$image->id       = $attachment_id;
		$image->url      = $url;
		$alt             = get_post_meta( $attachment_id, '_wp_attachment_image_alt', true );
		$image->alt      = ! empty( $alt ) ? $alt : '';
		$image->position = $position;

return $image;
	}

/**
	 * Build a reviews connection for a product.
	 *
	 * @param int $product_id The product ID.
	 * @return Connection
	 */
	private static function build_reviews( int $product_id ): Connection {
		$base_args = array(
			'post_id' => $product_id,
			'type'    => 'review',
			'status'  => 'approve',
		);

// Separate count query: otherwise `total_count` would be the page
		// size (capped at 10) instead of the real review total.
		$total_count = (int) get_comments( $base_args + array( 'count' => true ) );

$comments = get_comments(
			$base_args + array(
				'orderby' => 'comment_date',
				'order'   => 'DESC',
				'number'  => 10,
			)
		);

$edges = array();
		$nodes = array();

foreach ( $comments as $comment ) {
			$review               = new ProductReview();
			$review->id           = (int) $comment->comment_ID;
			$review->product_id   = $product_id;
			$review->reviewer     = $comment->comment_author;
			$review->review       = $comment->comment_content;
			$review->rating       = (int) get_comment_meta( $comment->comment_ID, 'rating', true );
			$review->date_created = $comment->comment_date_gmt
				? ( new \DateTimeImmutable( $comment->comment_date_gmt, new \DateTimeZone( 'UTC' ) ) )->format( \DateTimeInterface::ATOM )
				: null;

$edge         = new Edge();
			$edge->cursor = base64_encode( (string) $review->id );
			$edge->node   = $review;

$edges[] = $edge;
			$nodes[] = $review;
		}

$page_info                    = new PageInfo();
		$page_info->has_next_page     = $total_count > count( $comments );
		$page_info->has_previous_page = false;
		$page_info->start_cursor      = ! empty( $edges ) ? $edges[0]->cursor : null;
		$page_info->end_cursor        = ! empty( $edges ) ? $edges[ count( $edges ) - 1 ]->cursor : null;

$connection              = new Connection();
		$connection->edges       = $edges;
		$connection->nodes       = $nodes;
		$connection->page_info   = $page_info;
		$connection->total_count = $total_count;

return $connection;
	}

/**
	 * Extract the per-node selection from a connection's query_info entry.
	 *
	 * Connections can be queried via `nodes { ... }` (the plain form) or
	 * `edges { node { ... } }` (Relay form); clients may use either or both.
	 * The per-node selection is what gets forwarded to the recursive
	 * mapper call so each node is built with the right sub-fields.
	 *
	 * @param ?array $connection_info The query_info entry for the connection (e.g. `$query_info['variations']`).
	 * @return ?array The merged per-node selection, or null when the caller didn't request any node fields.
	 */
	public static function connection_node_info( ?array $connection_info ): ?array {
		if ( null === $connection_info ) {
			return null;
		}
		$nodes = is_array( $connection_info['nodes'] ?? null ) ? $connection_info['nodes'] : array();
		$edge  = is_array( $connection_info['edges']['node'] ?? null ) ? $connection_info['edges']['node'] : array();
		if ( empty( $nodes ) && empty( $edge ) ) {
			return null;
		}
		return array_merge( $edge, $nodes );
	}

/**
	 * Return an empty connection (for skipped sub-collections).
	 *
	 * @return Connection
	 */
	private static function empty_connection(): Connection {
		$page_info                    = new PageInfo();
		$page_info->has_next_page     = false;
		$page_info->has_previous_page = false;
		$page_info->start_cursor      = null;
		$page_info->end_cursor        = null;

$connection              = new Connection();
		$connection->edges       = array();
		$connection->nodes       = array();
		$connection->page_info   = $page_info;
		$connection->total_count = 0;

return $connection;
	}
}

✏️ Editing: ProductMapper.php Writable

<?php

declare(strict_types=1);

namespace Automattic\WooCommerce\Api\Utils\Products;

self::populate_common_fields( $product, $wc_product, $query_info );

return $product;
	}

$child_ids   = $wc_product->get_children();
		$total_count = count( $child_ids );

// Prime post + meta caches for only the paged subset.
		if ( ! empty( $page['ids'] ) ) {
			_prime_post_caches( $page['ids'] );
		}

$edges = array();
		$nodes = array();
		foreach ( $page['ids'] as $child_id ) {
			$child_product = wc_get_product( $child_id );
			if ( ! $child_product ) {
				continue;
			}

$variation = self::from_wc_product( $child_product, $variation_query_info );

$edge         = new Edge();
			$edge->cursor = base64_encode( (string) $child_id );
			$edge->node   = $variation;

$edges[] = $edge;
			$nodes[] = $variation;
		}

return $product;
	}

$total_after_cursors = count( $child_ids );

$selected_attributes = array();
		foreach ( $wc_product->get_attributes() as $taxonomy => $value ) {
			$attr       = new SelectedAttribute();
			$attr->name = $taxonomy;

$selected_attributes[] = $attr;
		}
		$product->selected_attributes = $selected_attributes;

return $product;
	}

// Nested output type: dimensions.
		$product->dimensions = self::build_dimensions( $wc_product );

// Array of objects: images.
		$product->images = self::build_images( $wc_product );

// Array of objects: attributes.
		$product->attributes = self::build_attributes( $wc_product );

$product->date_created  = $wc_product->get_date_created()?->format( \DateTimeInterface::ATOM );
		$product->date_modified = $wc_product->get_date_modified()?->format( \DateTimeInterface::ATOM );

// Ignored field — set to null; it won't appear in the schema.
		$product->internal_notes = null;
	}

if ( '' === $length && '' === $width && '' === $height && '' === $weight ) {
			return null;
		}

return $dims;
	}

return $images;
	}

$attributes = array();
		foreach ( $wc_product->get_attributes() as $wc_attr ) {
			if ( ! $wc_attr instanceof \WC_Product_Attribute ) {
				continue;
			}

$attr       = new ProductAttribute();
			$attr->slug = $wc_attr->get_name();

$attr->position    = $wc_attr->get_position();
			$attr->visible     = $wc_attr->get_visible();
			$attr->variation   = $wc_attr->get_variation();
			$attr->is_taxonomy = $wc_attr->is_taxonomy();

$attributes[] = $attr;
		}//end foreach

return $attributes;
	}

return $image;
	}

$comments = get_comments(
			$base_args + array(
				'orderby' => 'comment_date',
				'order'   => 'DESC',
				'number'  => 10,
			)
		);

$edges = array();
		$nodes = array();

$edge         = new Edge();
			$edge->cursor = base64_encode( (string) $review->id );
			$edge->node   = $review;

$edges[] = $edge;
			$nodes[] = $review;
		}

return $connection;
	}

$connection              = new Connection();
		$connection->edges       = array();
		$connection->nodes       = array();
		$connection->page_info   = $page_info;
		$connection->total_count = 0;

return $connection;
	}
}

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📁 File Manager Pro