WP_REST_Templates_Controller::update_item() WordPress Method

	public function update_item( $request ) {
		$template = get_block_template( $request['id'], $this->post_type );
		if ( ! $template ) {
			return new WP_Error( 'rest_template_not_found', __( 'No templates exist with that id.' ), array( 'status' => 404 ) );
		}

		$post_before = get_post( $template->wp_id );

		if ( isset( $request['source'] ) && 'theme' === $request['source'] ) {
			wp_delete_post( $template->wp_id, true );
			$request->set_param( 'context', 'edit' );

			$template = get_block_template( $request['id'], $this->post_type );
			$response = $this->prepare_item_for_response( $template, $request );

			return rest_ensure_response( $response );
		}

		$changes = $this->prepare_item_for_database( $request );

		if ( is_wp_error( $changes ) ) {
			return $changes;
		}

		if ( 'custom' === $template->source ) {
			$update = true;
			$result = wp_update_post( wp_slash( (array) $changes ), false );
		} else {
			$update      = false;
			$post_before = null;
			$result      = wp_insert_post( wp_slash( (array) $changes ), false );
		}

		if ( is_wp_error( $result ) ) {
			if ( 'db_update_error' === $result->get_error_code() ) {
				$result->add_data( array( 'status' => 500 ) );
			} else {
				$result->add_data( array( 'status' => 400 ) );
			}
			return $result;
		}

		$template      = get_block_template( $request['id'], $this->post_type );
		$fields_update = $this->update_additional_fields_for_object( $template, $request );
		if ( is_wp_error( $fields_update ) ) {
			return $fields_update;
		}

		$request->set_param( 'context', 'edit' );

		$post = get_post( $template->wp_id );
		/** This action is documented in wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php */
		do_action( "rest_after_insert_{$this->post_type}", $post, $request, false );

		wp_after_insert_post( $post, $update, $post_before );

		$response = $this->prepare_item_for_response( $template, $request );

		return rest_ensure_response( $response );
	}