Automattic\WooCommerce\Blocks\BlockTypes

AbstractProductGrid::prime_product_variations │ protected │ WC 1.0

Prime query cache of product variation meta data.

Prepares values in the product_ID_variation_meta_data cache for later use in the ProductSchema::get_variations() method. Doing so here reduces the total number of queries needed.

Method of the class: AbstractProductGrid{}

No Hooks.

Returns

null. Nothing (null).

Usage

// protected - for code of main (parent) or child class
$result = $this->prime_product_variations( $product_ids );
$product_ids(int[]) (required)
Product ids to prime variation cache for.

AbstractProductGrid::prime_product_variations() code WC 10.3.6

woocommerce/src/Blocks/BlockTypes/AbstractProductGrid.php 
protected function prime_product_variations( $product_ids ) {
	$cache_group       = 'product_variation_meta_data';
	$prime_product_ids = $this->get_non_cached_ids( wp_parse_id_list( $product_ids ), $cache_group );

	if ( ! $prime_product_ids ) {
		return;
	}

	global $wpdb;

	// phpcs:disable WordPress.DB.PreparedSQL.NotPrepared
	$product_variations      = $wpdb->get_results( "SELECT ID as variation_id, post_parent as product_id from {$wpdb->posts} WHERE post_parent IN ( " . implode( ',', $prime_product_ids ) . ' )', ARRAY_A );
	$prime_variation_ids     = array_column( $product_variations, 'variation_id' );
	$variation_ids_by_parent = array_column( $product_variations, 'product_id', 'variation_id' );

	if ( empty( $prime_variation_ids ) ) {
		return;
	}

	$all_variation_meta_data = $wpdb->get_results(
		$wpdb->prepare(
			"SELECT post_id as variation_id, meta_key as attribute_key, meta_value as attribute_value FROM {$wpdb->postmeta} WHERE post_id IN (" . implode( ',', array_map( 'esc_sql', $prime_variation_ids ) ) . ') AND meta_key LIKE %s',
			$wpdb->esc_like( 'attribute_' ) . '%'
		)
	);
	// phpcs:enable
	// Prepare the data to cache by indexing by the parent product.
	$primed_data = array_reduce(
		$all_variation_meta_data,
		function( $values, $data ) use ( $variation_ids_by_parent ) {
			$values[ $variation_ids_by_parent[ $data->variation_id ] ?? 0 ][] = $data;
			return $values;
		},
		array_fill_keys( $prime_product_ids, [] )
	);

	// Cache everything.
	foreach ( $primed_data as $product_id => $variation_meta_data ) {
		wp_cache_set(
			$product_id,
			[
				'last_modified' => get_the_modified_date( 'U', $product_id ),
				'data'          => $variation_meta_data,
			],
			$cache_group
		);
	}
}