fix: ProductUnion interface added (#797)

* fix: ProductUnion interface added

* chore: Linter and PHPStan compliance met

Author: kidunot89

access-functions.php

@@ -6,39 +6,45 @@
  * @since 0.0.1
  */
 
-if ( ! function_exists( 'wc_graphql_starts_with' ) ) {
+if ( ! function_exists( 'str_starts_with' ) ) {
 	/**
-	 * Checks if source string starts with the target string
+	 * Polyfill for PHP 8 str_starts_with function.
+	 * Checks if a string starts with a given substring.
+	 *
+	 * @see https://www.php.net/manual/en/function.str-starts-with.php
 	 *
 	 * @param string $haystack - Source string.
 	 * @param string $needle - Target string.
 	 *
-	 * @return bool
+	 * @return bool - True if $haystack starts with $needle, false otherwise.
 	 */
-	function wc_graphql_starts_with( $haystack, $needle ) {
+	function str_starts_with( $haystack, $needle ) {
 		$length = strlen( $needle );
 		return ( substr( $haystack, 0, $length ) === $needle );
 	}
 }
 
-if ( ! function_exists( 'wc_graphql_ends_with' ) ) {
+if ( ! function_exists( 'str_ends_with' ) ) {
 	/**
-	 * Checks if source string ends with the target string
+	 * Polyfill for PHP 8 str_ends_with function.
+	 * Checks if a string ends with a given substring.
+	 *
+	 * @see https://www.php.net/manual/en/function.str-ends-with.php
 	 *
 	 * @param string $haystack - Source string.
 	 * @param string $needle - Target string.
 	 *
-	 * @return bool
+	 * @return bool - True if $haystack ends with $needle, false otherwise.
 	 */
-	function wc_graphql_ends_with( $haystack, $needle ) {
+	function str_ends_with( $haystack, $needle ) {
 		$length = strlen( $needle );
 		if ( 0 === $length ) {
 			return true;
 		}
 
 		return ( substr( $haystack, -$length ) === $needle );
 	}
-}
+}//end if
 
 if ( ! function_exists( 'wc_graphql_map_tax_statements' ) ) {
 	/**

includes/class-core-schema-filters.php

@@ -92,13 +92,6 @@ public static function add_filters() {
 			7
 		);
 
-		add_filter(
-			'graphql_map_input_fields_to_wp_query',
-			[ '\WPGraphQL\WooCommerce\Connection\Products', 'map_input_fields_to_wp_query' ],
-			10,
-			7
-		);
-
 		add_filter(
 			'graphql_map_input_fields_to_wp_user_query',
 			[ '\WPGraphQL\WooCommerce\Connection\Customers', 'map_input_fields_to_wp_query' ],

includes/class-type-registry.php

@@ -69,6 +69,7 @@ public function init() {
 		Type\WPInterface\Product_Attribute::register_interface();
 		Type\WPInterface\Cart_Error::register_interface();
 		Type\WPInterface\Payment_Token::register_interface();
+		Type\WPInterface\Product_Union::register_interface();
 
 		/**
 		 * Objects.

includes/class-wp-graphql-woocommerce.php

@@ -74,15 +74,23 @@ public static function get_enabled_product_types() {
 			return apply_filters(
 				'graphql_woocommerce_product_types',
 				[
-					'simple'    => 'SimpleProduct',
-					'variable'  => 'VariableProduct',
-					'external'  => 'ExternalProduct',
-					'grouped'   => 'GroupProduct',
-					'variation' => 'ProductVariation',
+					'simple'   => 'SimpleProduct',
+					'variable' => 'VariableProduct',
+					'external' => 'ExternalProduct',
+					'grouped'  => 'GroupProduct',
 				]
 			);
 		}
 
+		/**
+		 * Returns WooCommerce product variation types to be exposed to the GraphQL schema.
+		 *
+		 * @return array
+		 */
+		public static function get_enabled_product_variation_types() {
+			return apply_filters( 'graphql_woocommerce_product_variation_types', [ 'variation' => 'ProductVariation' ] );
+		}
+
 		/**
 		 * Returns GraphQL Product Type name for product types not supported by the GraphQL schema.
 		 *
@@ -235,6 +243,7 @@ private function includes() {
 			require $include_directory_path . 'type/interface/class-product-attribute.php';
 			require $include_directory_path . 'type/interface/class-product.php';
 			require $include_directory_path . 'type/interface/class-payment-token.php';
+			require $include_directory_path . 'type/interface/class-product-union.php';
 
 			// Include object type class files.
 			require $include_directory_path . 'type/object/class-cart-error-types.php';