Define custom hooks for transformer when liberated data is ready for transformation

src/plugin/class-engine.php

@@ -15,7 +15,7 @@ public function __construct() {
 		require 'utils.php';
 
 		( function () {
-			$transformer = new Transformer( $this->storage_post_type );
+			$transformer = new Transformer();
 
 			new Post_Type_UI( $this->storage_post_type, $transformer );
 

src/plugin/class-subjects-controller.php

@@ -292,6 +292,8 @@ public function create_item( $request ): WP_REST_Response|WP_Error {
 		$subject_type = $this->get_subject_type( $request );
 		update_post_meta( $item['ID'], 'subject_type', $subject_type );
 
+		do_action( 'dl_data_saved', $item['ID'], 'create' );
+
 		return $this->prepare_item_for_response( $item, $request, $subject_type );
 	}
 
@@ -314,6 +316,8 @@ public function update_item( $request ): WP_REST_Response|WP_Error {
 			update_post_meta( $item['ID'], $key, $value );
 		}
 
+		do_action( 'dl_data_saved', $item['ID'], 'update' );
+
 		return $this->prepare_item_for_response( $item, $request );
 	}
 

src/plugin/class-transformer.php

@@ -7,15 +7,8 @@
 class Transformer {
 	private string $meta_key_for_transformed_post = '_dl_transformed';
 
-	public function __construct( $post_type ) {
-		add_action(
-			'save_post_' . $post_type,
-			function ( $post_id, $post ) {
-				$this->transform( $post );
-			},
-			10,
-			2
-		);
+	public function __construct() {
+		add_action( 'dl_data_saved', array( $this, 'transform' ), 10, 2 );
 	}
 
 	private function get_post_type_for_transformed_post( int|WP_Post $liberated_post ): string {
@@ -51,14 +44,12 @@ public function get_transformed_post_id( $liberated_post_id ): int|null {
 		return absint( $value );
 	}
 
-	public function transform( int|WP_Post $liberated_post ): bool {
+	public function transform( int $liberated_post_id, string $verb ): bool {
 		if ( apply_filters( 'skip_native_transformation', false ) ) {
 			return true;
 		}
 
-		if ( is_int( $liberated_post ) ) {
-			$liberated_post = get_post( $liberated_post );
-		}
+		$liberated_post = get_post( $liberated_post_id );
 
 		$transformed_post_id = get_post_meta( $liberated_post->ID, $this->meta_key_for_transformed_post, true );
 

tests/plugin/test-transformer.php

@@ -60,7 +60,7 @@ public function testGetTransformedPost() {
 	}
 
 	public function testTransform(): void {
-		$result = $this->transformer->transform( get_post( $this->post_id_in_db ) );
+		$result = $this->transformer->transform( $this->post_id_in_db, 'whatever' ); // verb isn't currently used
 
 		$transformed_post_id = absint( get_post_meta( $this->post_id_in_db, '_dl_transformed', true ) );