it is working

SpringApp/library/src/main/java/com/ip/library/controllers/books/BookDto.java

@@ -22,6 +22,10 @@ public class BookDto {
     private Long typeId;
     @NotNull
     private List<Long> authorsId;
+    @NotNull
+    private boolean isChosen = false;
+    @Min(0)
+    private int fansNumber = 0;
 
     public Long getId() {
         return id;
@@ -70,4 +74,20 @@ public class BookDto {
     public void setAuthorsId(List<Long> authorsId) {
         this.authorsId = authorsId;
     }
+
+    public boolean getIsChosen() {
+        return isChosen;
+    }
+
+    public void setIsChosen(boolean isChosen) {
+        this.isChosen = isChosen;
+    }
+
+    public int getFansNumber() {
+        return fansNumber;
+    }
+
+    public void setFansNumber(int fansNumber) {
+        this.fansNumber = fansNumber;
+    }
 }

SpringApp/library/src/main/java/com/ip/library/controllers/books/BookEntity.java

@@ -15,9 +15,11 @@ import jakarta.persistence.ManyToOne;
 import jakarta.persistence.OneToMany;
 import jakarta.persistence.OrderBy;
 import jakarta.persistence.Table;
+import jakarta.persistence.Transient;
 
 import com.ip.library.controllers.authors.AuthorEntity;
 import com.ip.library.controllers.authors_books.AuthorsBooksEntity;
+import com.ip.library.controllers.favorites.FavoriteEntity;
 import com.ip.library.controllers.types.TypeEntity;
 
 @Entity
@@ -32,6 +34,13 @@ public class BookEntity extends BaseEntity {
     @OneToMany(mappedBy = "book", cascade = CascadeType.ALL, fetch = FetchType.EAGER)
     @OrderBy("id ASC")
     private Set<AuthorsBooksEntity> authorsBooks = new HashSet<>();
+    @OneToMany(mappedBy = "book", cascade = CascadeType.ALL, fetch = FetchType.LAZY)
+    @OrderBy("id ASC")
+    private Set<FavoriteEntity> fans = new HashSet<>();
+    @Transient
+    private boolean isChosen = false;
+    @Transient
+    private int fansNumber = 0;
 
     public BookEntity() {
         super();
@@ -42,14 +51,6 @@ public class BookEntity extends BaseEntity {
         this.type = type;
     }
 
-    public String getName() {
-        return name;
-    }
-
-    public void setName(String name) {
-        this.name = name;
-    }
-
     public TypeEntity getType() {
         return type;
     }
@@ -66,6 +67,38 @@ public class BookEntity extends BaseEntity {
         this.authorsBooks = authorsBooks;
     }
 
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public boolean getIsChosen() {
+        return isChosen;
+    }
+
+    public void setIsChosen(boolean isChosen) {
+        this.isChosen = isChosen;
+    }
+
+    public int getFansNumber() {
+        return fansNumber;
+    }
+
+    public void setFansNumber(int fansNumber) {
+        this.fansNumber = fansNumber;
+    }
+
+    public Set<FavoriteEntity> getFans() {
+        return fans;
+    }
+
+    public void setFans(Set<FavoriteEntity> fans) {
+        this.fans = fans;
+    }
+
     public boolean addAuthor(AuthorEntity author) {
         AuthorsBooksEntity entity = new AuthorsBooksEntity(author, this);
         return authorsBooks.add(entity);

SpringApp/library/src/main/java/com/ip/library/controllers/books/BookService.java

@@ -13,6 +13,7 @@ import com.ip.library.controllers.authors.AuthorService;
 import com.ip.library.controllers.authors_books.AuthorsBooksEntity;
 import com.ip.library.controllers.authors_books.AuthorsBooksId;
 import com.ip.library.controllers.authors_books.AuthorsBooksRepository;
+import com.ip.library.controllers.users.UserRepository;
 import com.ip.library.core.error.NotFoundException;
 
 @Service
@@ -20,14 +21,17 @@ public class BookService {
     private final AuthorsBooksRepository authorsBooksRepository;
     private final BookRepository bookRepository;
     private final AuthorService authorService;
+    private final UserRepository userRepository;
 
     public BookService(
                 BookRepository bookRepository,
                 AuthorService authorService,
-                AuthorsBooksRepository authorsBooksRepository) {
+                AuthorsBooksRepository authorsBooksRepository,
+                UserRepository userRepository) {
         this.bookRepository = bookRepository;
         this.authorService = authorService;
         this.authorsBooksRepository = authorsBooksRepository;
+        this.userRepository = userRepository;
     }
 
     private void checkNameUniqueness(String name){
@@ -55,6 +59,32 @@ public class BookService {
         return bookRepository.findByAuthorIdAndTypeId(authorId, typeId, pageRequest);
     }
 
+    @Transactional(readOnly = true)
+    public Page<BookEntity> getAll(long typeId, long authorId, long userId, int page, int size) {
+        PageRequest pageRequest = PageRequest.of(page, size);
+        Page<BookEntity> result = null;
+        if (typeId <= 0L && authorId <= 0L) {
+            result =  bookRepository.findAll(pageRequest);
+        }
+        else if (authorId <= 0L){
+            result =  bookRepository.findByTypeId(typeId, pageRequest);
+        }
+        else if (typeId <= 0L) {
+            result = bookRepository.findByAuthorId(authorId, pageRequest);
+        }
+        else {
+            result = bookRepository.findByAuthorIdAndTypeId(authorId, typeId, pageRequest);
+        }
+        List<BookEntity> favorites = getUserFavorities(userId);
+        for (BookEntity book : result.getContent()) {
+            if (favorites.contains(book)) {
+                book.setIsChosen(true);
+            }
+            book.setFansNumber(book.getFans().size());
+        }
+        return result;
+    }
+
     @Transactional(readOnly = true)
     public List<BookEntity> getAll(long typeId, long authorId) {
         if (typeId <= 0L && authorId <= 0L)
@@ -122,6 +152,11 @@ public class BookService {
         return bookRepository.getBookSubscribersNumber(bookId);
     }
 
+    @Transactional(readOnly = true)
+    public List<BookEntity> getUserFavorities (long userId) {
+        return userRepository.getUserFavorities(userId);
+    }
+
     @Transactional(readOnly = true)
     public List<AuthorEntity> getAuthors(long bookId) {
         return bookRepository.getAuthors(bookId);

SpringApp/library/src/main/java/com/ip/library/controllers/users/UserBookController.java

@@ -99,9 +99,10 @@ public class UserBookController {
             @RequestParam(name = PAGE_ATTRIBUTE, defaultValue = "0") int page,
             @RequestParam(name = TYPE_ATTRIBUTE, defaultValue = "-1") Long typeId,
             @RequestParam(name = AUTHOR_ATTRIBUTE, defaultValue = "-1") Long authorId,
-            Model model) {
+            Model model,
+            @AuthenticationPrincipal UserPrincipal principal) {
         final Map<String, Object> attributes = PageAttributesMapper.toAttributes(
-                bookService.getAll(typeId, authorId, page, Constants.DEFUALT_PAGE_SIZE), 
+                bookService.getAll(typeId, authorId, principal.getId(), page, Constants.DEFUALT_PAGE_SIZE), 
 				this::toBookDto);
         model.addAllAttributes(attributes);
         model.addAttribute(TYPE_ATTRIBUTE, typeId);

SpringApp/library/src/main/resources/templates/book-search.html

@@ -42,6 +42,7 @@
                             <th scope="col" class="w-auto">Название</th>
                             <th scope="col" class="w-auto">Жанр</th>
                             <th scope="col" class="w-auto">Автор</th>
+                            <th scope="col" class="w-auto">Добавили в избранное</th>
                             <th scope="col" class="w-10"></th>
                         </tr>
                     </thead>
@@ -51,10 +52,12 @@
                             <td th:text="${book.name}"></td>
                             <td th:text="${book.typeName}"></td>
                             <td th:text="${book.authorName}"></td>
+                            <td th:text="${book.fansNumber}"></td>
                             <td>
                                 <form th:action="@{/api/1.0/addFavorite/{id}(id=${book.id})}" method="post">
                                     <input type="hidden" th:name="page" th:value="${page}">
-                                    <button type="submit" class="btn btn-link button-link">В избранное</button>
+                                    <button type="submit" class="btn btn-link button-link" 
+                                        th:hidden="${book.isChosen}">В избранное</button>
                                 </form>
                             </td>
                         </tr>