Review Delete Service

Watch Code

In this lesson, we'll implement the functionality that enables the deletion of reviews from restaurants in our platform.

Service Layer Implementation

Let's add the deleteReview method to the service layer:

void deleteReview(String restaurantId, String reviewId);

Now let's implement this method in our ReviewServiceImpl class:

@Override
public void deleteReview(String restaurantId, String reviewId) {
    // Get the restaurant or throw an exception if not found
    Restaurant restaurant = getRestaurantOrThrow(restaurantId);

    // Filter out the review with the matching ID
    List<Review> filteredReviews = restaurant.getReviews().stream()
            .filter(review -> !reviewId.equals(review.getId()))
            .toList();

    // Update the restaurant's reviews
    restaurant.setReviews(filteredReviews);

    // Update the restaurant's average rating
    updateRestaurantAverageRating(restaurant);

    // Save the updated restaurant
    restaurantRepository.save(restaurant);
}

Summary

Review deletion is handled through the deleteReview method in ReviewServiceImpl
The implementation removes the review and updates the restaurant's average rating