WP_REST_Templates_Controller::update_item( WP_REST_Request $request ): WP_REST_Response|WP_Error

362	public function update_item( $request ) {363		$template = get_block_template( $request['id'], $this->post_type );364		if ( ! $template ) {365			return new WP_Error( 'rest_template_not_found', __( 'No templates exist with that id.' ), array( 'status' => 404 ) );366		}367 368		$post_before = get_post( $template->wp_id );369 370		if ( isset( $request['source'] ) && 'theme' === $request['source'] ) {371			wp_delete_post( $template->wp_id, true );372			$request->set_param( 'context', 'edit' );373 374			$template = get_block_template( $request['id'], $this->post_type );375			$response = $this->prepare_item_for_response( $template, $request );376 377			return rest_ensure_response( $response );378		}379 380		$changes = $this->prepare_item_for_database( $request );381 382		if ( is_wp_error( $changes ) ) {383			return $changes;384		}385 386		if ( 'custom' === $template->source ) {387			$update = true;388			$result = wp_update_post( wp_slash( (array) $changes ), false );389		} else {390			$update      = false;391			$post_before = null;392			$result      = wp_insert_post( wp_slash( (array) $changes ), false );393		}394 395		if ( is_wp_error( $result ) ) {396			if ( 'db_update_error' === $result->get_error_code() ) {397				$result->add_data( array( 'status' => 500 ) );398			} else {399				$result->add_data( array( 'status' => 400 ) );400			}401			return $result;402		}403 404		$template      = get_block_template( $request['id'], $this->post_type );405		$fields_update = $this->update_additional_fields_for_object( $template, $request );406		if ( is_wp_error( $fields_update ) ) {407			return $fields_update;408		}409 410		$request->set_param( 'context', 'edit' );411 412		$post = get_post( $template->wp_id );413		/** This action is documented in wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php */414		do_action( "rest_after_insert_{$this->post_type}", $post, $request, false );415 416		wp_after_insert_post( $post, $update, $post_before );417 418		$response = $this->prepare_item_for_response( $template, $request );419 420		return rest_ensure_response( $response );421	}