Getting all books by author id

Signed-off-by: Kemal Žigović <kvant800@gmail.com>

Author: Kvark900

src/main/java/com/kvark900/api/controller/BookController.java

@@ -46,11 +46,11 @@ public ResponseEntity<Book> getBook(@PathVariable Long id){
  else return new ResponseEntity<>(book, HttpStatus.OK);
  }
 
- @GetMapping ("/by-topics-id/{topicIds}")
+ @GetMapping ("/by-topic-id/{topicIds}")
  public ResponseEntity<List<Book>> getAllBooksByTopicId(@PathVariable Long [] topicIds){
  List<Book> allBooksByTopicId = new ArrayList<>();
  for (Long topicId : topicIds){
- List<Book> booksByTopicId = bookService.findByTopicId(topicId);
+ List<Book> booksByTopicId = bookService.findByTopicsId(topicId);
  if(!booksByTopicId.isEmpty()){
  allBooksByTopicId.addAll(booksByTopicId);
  }
@@ -61,6 +61,20 @@ public ResponseEntity<List<Book>> getAllBooksByTopicId(@PathVariable Long [] top
  else return new ResponseEntity<>(allBooksByTopicId, HttpStatus.OK);
  }
 
+ @GetMapping ("/by-author-id/{authorIds}")
+ public ResponseEntity<List<Book>> getAllBooksByAuthorId(@PathVariable Long [] authorIds){
+ List<Book> allBooksByAuthorId = new ArrayList<>();
+ for (Long authorId : authorIds){
+ List<Book> booksByAuthorId = bookService.findByAuthorsId(authorId);
+ if(!booksByAuthorId.isEmpty()){
+ allBooksByAuthorId.addAll(booksByAuthorId);
+ }
+ }
+ if(allBooksByAuthorId.isEmpty()){
+ return new ResponseEntity<>(allBooksByAuthorId, HttpStatus.NO_CONTENT);
+ }
+ else return new ResponseEntity<>(allBooksByAuthorId, HttpStatus.OK);
+ }
 
  @PostMapping ("")
  public ResponseEntity<Book> saveBook(@RequestBody @Valid Book book, BindingResult bindingResult,

src/main/java/com/kvark900/api/repository/BookRepository.java

@@ -12,4 +12,5 @@
 public interface BookRepository extends JpaRepository<Book, Long> {
  Book findByTitleAllIgnoreCase(String title);
  List<Book> findByTopicsId(Long id);
+ List<Book> findByAuthorsId(Long id);
 }

src/main/java/com/kvark900/api/service/BookService.java

@@ -29,7 +29,9 @@ public Book findById(Long id){
 
  public Book findByTitle (String title){return bookRepository.findByTitleAllIgnoreCase(title);}
 
- public List<Book> findByTopicId (Long id){return bookRepository.findByTopicsId(id);}
+ public List<Book> findByTopicsId(Long id){return bookRepository.findByTopicsId(id);}
+
+ public List<Book> findByAuthorsId(Long id){return bookRepository.findByAuthorsId(id);}
 
 
  public void save(Book book){