WP_REST_Comments_Controller::update_item

	public function update_item( $request ) {
		$comment = $this->get_comment( $request['id'] );
		if ( is_wp_error( $comment ) ) {
			return $comment;
		}

		$id = $comment->comment_ID;

		if ( isset( $request['type'] ) && get_comment_type( $id ) !== $request['type'] ) {
			return new WP_Error(
				'rest_comment_invalid_type',
				__( 'Sorry, you are not allowed to change the comment type.' ),
				array( 'status' => 404 )
			);
		}

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

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

		if ( ! empty( $prepared_args['comment_post_ID'] ) ) {
			$post = get_post( $prepared_args['comment_post_ID'] );

			if ( empty( $post ) ) {
				return new WP_Error(
					'rest_comment_invalid_post_id',
					__( 'Invalid post ID.' ),
					array( 'status' => 403 )
				);
			}
		}

		if ( empty( $prepared_args ) && isset( $request['status'] ) ) {
			// Only the comment status is being changed.
			$change = $this->handle_status_param( $request['status'], $id );

			if ( ! $change ) {
				return new WP_Error(
					'rest_comment_failed_edit',
					__( 'Updating comment status failed.' ),
					array( 'status' => 500 )
				);
			}
		} elseif ( ! empty( $prepared_args ) ) {
			if ( is_wp_error( $prepared_args ) ) {
				return $prepared_args;
			}

			if ( isset( $prepared_args['comment_content'] ) && empty( $prepared_args['comment_content'] ) ) {
				return new WP_Error(
					'rest_comment_content_invalid',
					__( 'Invalid comment content.' ),
					array( 'status' => 400 )
				);
			}

			$prepared_args['comment_ID'] = $id;

			$check_comment_lengths = wp_check_comment_data_max_lengths( $prepared_args );

			if ( is_wp_error( $check_comment_lengths ) ) {
				$error_code = $check_comment_lengths->get_error_code();
				return new WP_Error(
					$error_code,
					__( 'Comment field exceeds maximum length allowed.' ),
					array( 'status' => 400 )
				);
			}

			$updated = wp_update_comment( wp_slash( (array) $prepared_args ), true );

			if ( is_wp_error( $updated ) ) {
				return new WP_Error(
					'rest_comment_failed_edit',
					__( 'Updating comment failed.' ),
					array( 'status' => 500 )
				);
			}

			if ( isset( $request['status'] ) ) {
				$this->handle_status_param( $request['status'], $id );
			}
		}

		$comment = get_comment( $id );

		/** This action is documented in wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php */
		do_action( 'rest_insert_comment', $comment, $request, false );

		$schema = $this->get_item_schema();

		if ( ! empty( $schema['properties']['meta'] ) && isset( $request['meta'] ) ) {
			$meta_update = $this->meta->update_value( $request['meta'], $id );

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

		$fields_update = $this->update_additional_fields_for_object( $comment, $request );

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

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

		/** This action is documented in wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php */
		do_action( 'rest_after_insert_comment', $comment, $request, false );

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

		return rest_ensure_response( $response );
	}