Getting all books by topic ids; suppressing duplicates warnings; cascadeType changes

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

Author: Kvark900

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

@@ -16,6 +16,7 @@
 /**
  * Created by Keno&Kemo on 17.12.2017..
  */
+@SuppressWarnings("Duplicates")
 @RestController
 @RequestMapping(value = "/authors", produces = MediaType.APPLICATION_JSON_UTF8_VALUE,
  consumes = MediaType.APPLICATION_JSON_UTF8_VALUE)

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

@@ -11,8 +11,10 @@
 import org.springframework.web.util.UriComponentsBuilder;
 
 import javax.validation.Valid;
+import java.util.ArrayList;
 import java.util.List;
 
+@SuppressWarnings("Duplicates")
 @RestController
 @RequestMapping(value = "/books", produces = MediaType.APPLICATION_JSON_UTF8_VALUE,
  consumes = MediaType.APPLICATION_JSON_UTF8_VALUE)
@@ -44,6 +46,22 @@ public ResponseEntity<Book> getBook(@PathVariable Long id){
  else return new ResponseEntity<>(book, HttpStatus.OK);
  }
 
+ @GetMapping ("/by-topics-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);
+ if(!booksByTopicId.isEmpty()){
+ allBooksByTopicId.addAll(booksByTopicId);
+ }
+ }
+ if(allBooksByTopicId.isEmpty()){
+ return new ResponseEntity<>(allBooksByTopicId, HttpStatus.NO_CONTENT);
+ }
+ else return new ResponseEntity<>(allBooksByTopicId, HttpStatus.OK);
+ }
+
+
  @PostMapping ("")
  public ResponseEntity<Book> saveBook(@RequestBody @Valid Book book, BindingResult bindingResult,
  UriComponentsBuilder uriComponentsBuilder){

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

@@ -13,6 +13,7 @@
 import javax.validation.Valid;
 import java.util.List;
 
+@SuppressWarnings("Duplicates")
 @RestController
 @RequestMapping (value = "/topics",produces = MediaType.APPLICATION_JSON_UTF8_VALUE,
  consumes = MediaType.APPLICATION_JSON_UTF8_VALUE)
@@ -56,7 +57,7 @@ public ResponseEntity<Topic> addTopic(@RequestBody @Valid Topic topic, BindingRe
  return new ResponseEntity<>(headers, HttpStatus.BAD_REQUEST);
  }
  else{
- topicService.save(topic);
+  topicService.save(topic);
  headers.setLocation(uriComponentsBuilder.path("/books/{id}").
  buildAndExpand(topic.getId()).toUri());
  return new ResponseEntity<>(topic, headers, HttpStatus.CREATED);

src/main/java/com/kvark900/api/model/Author.java

@@ -23,7 +23,7 @@ public class Author {
 
 // @NotNull
  @JsonIgnore
- @ManyToMany(cascade = CascadeType.PERSIST, mappedBy = "authors")
+ @ManyToMany(cascade = {CascadeType.PERSIST, CascadeType.MERGE}, mappedBy = "authors")
  private Set<Book> books = new HashSet<>();
 
 
@@ -35,6 +35,7 @@ public Author(String name, String surname, Set<Book> books) {
  this.surname = surname;
  this.books = books;
  }
+
  @Autowired
  public Author(String name, String surname) {
  this.id = id;

src/main/java/com/kvark900/api/model/Book.java

@@ -16,7 +16,7 @@ public class Book {
  private String title;
 
  @NotNull
- @ManyToMany(cascade = CascadeType.PERSIST, targetEntity = Author.class)
+ @ManyToMany(cascade = {CascadeType.PERSIST, CascadeType.MERGE}, targetEntity = Author.class)
  @JoinTable(name = "book_author",
  joinColumns = @JoinColumn(name = "book_id"),
  inverseJoinColumns = @JoinColumn(name = "author_id")

src/main/java/com/kvark900/api/model/Topic.java

@@ -23,7 +23,7 @@ public class Topic {
  private String description;
 
  @JsonIgnore
- @ManyToMany(cascade = CascadeType.ALL, targetEntity = Book.class, mappedBy = "topics")
+ @ManyToMany(cascade = {CascadeType.PERSIST, CascadeType.MERGE}, targetEntity = Book.class, mappedBy = "topics")
  private Set<Book> books = new HashSet<>();
 
  //Constructors

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

@@ -5,9 +5,11 @@
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.stereotype.Repository;
 
+import java.util.List;
+
 
 @Repository
 public interface BookRepository extends JpaRepository<Book, Long> {
  Book findByTitleAllIgnoreCase(String title);
-
+ List<Book> findByTopicsId(Long id);
 }

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

@@ -29,6 +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 void save(Book book){
  bookRepository.save(book);
  }