Update database with Fluent API approach
public Book book(Long bookId, Book book) {
return bookRepository.findById(bookId).
map(foundBook -> {
foundBook.setName(book.getName());
foundBook.setDescription(book.getDescription());
foundBook.setImageUrl(book.getImageUrl());
return bookRepository.save(foundBook);
})
.orElseThrow(() -> new BookNotFoundException(bookId));
}
How it works?
- Find book by its id.
- If exists, map the found book and set the new values that needs to be updated.
- Save the book and return immediately.
- Throw not found exception if book is not found
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