Restaurant Update Service

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In this lesson, we'll implement the complete update functionality for restaurants in our service layer, building on our previous design decisions and exception handling setup.

Full Update Implementation

The full update approach means that when a restaurant is updated, all fields are replaced with the new values provided in the request.

Let's break down the implementation of the updateRestaurant method in RestaurantServiceImpl:

    @Override
    public Restaurant updateRestaurant(String id, RestaurantCreateUpdateRequest restaurantCreateUpdateRequest) {
        // First, verify the restaurant exists
        Restaurant existingRestaurant = getRestaurant(id)
                .orElseThrow(() -> new RestaurantNotFoundException("Restaurant with ID does not exist: " + id));

        // Get new geo coordinates based on the updated address
        GeoLocation newGeoLocation = geoLocationService.geoLocate(restaurantCreateUpdateRequest.getAddress());
        GeoPoint newGeoPoint = new GeoPoint(newGeoLocation.getLatitude(), newGeoLocation.getLongitude());

        // Convert photo URLs to Photo entities
        List<Photo> photos = restaurantCreateUpdateRequest.getPhotoIds().stream().map(photoUrl ->
                Photo.builder()
                        .url(photoUrl)
                        .uploadDate(LocalDateTime.now())
                        .build()
        ).collect(Collectors.toList());

        // Update all fields except averageRating
        existingRestaurant.setName(restaurantCreateUpdateRequest.getName());
        existingRestaurant.setCuisineType(restaurantCreateUpdateRequest.getCuisineType());
        existingRestaurant.setContactInformation(restaurantCreateUpdateRequest.getContactInformation());
        existingRestaurant.setAddress(restaurantCreateUpdateRequest.getAddress());
        existingRestaurant.setGeoLocation(newGeoPoint);
        existingRestaurant.setOperatingHours(restaurantCreateUpdateRequest.getOperatingHours());
        existingRestaurant.setPhotos(photos);

        return restaurantRepository.save(existingRestaurant);
    }

Error Handling

As designed in our previous lesson, we use the RestaurantNotFoundException when a restaurant with the provided ID doesn't exist.

The exception is thrown through the .orElseThrow() method when getRestaurant() returns an empty Optional.

Data Preservation

Notice that we maintain the restaurant's averageRating during updates.

This is important because the rating is calculated from user reviews and shouldn't be affected by restaurant information updates.

Summary

Implemented full update method in RestaurantServiceImpl
Used RestaurantNotFoundException when restaurant not found
Preserved averageRating during updates