класс избранное репозиторий и сервис

backend/src/main/java/com/example/backend/favorites/repository/FavoriteRepository.java

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+package com.example.backend.favorites.repository;
+
+import org.springframework.stereotype.Repository;
+
+import com.example.backend.core.repository.MapRepository;
+import com.example.backend.favorites.model.FavoriteEntity;
+
+@Repository
+public class FavoriteRepository extends MapRepository<FavoriteEntity> {
+
+}

backend/src/main/java/com/example/backend/favorites/service/FavoriteService.java

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+package com.example.backend.favorites.service;
+
+import java.util.List;
+import java.util.Objects;
+import java.util.Optional;
+
+import org.springframework.stereotype.Service;
+
+import com.example.backend.core.errors.NotFoundException;
+import com.example.backend.favorites.model.FavoriteEntity;
+import com.example.backend.favorites.repository.FavoriteRepository;
+
+@Service
+public class FavoriteService {
+    private final FavoriteRepository repository;
+
+    public FavoriteService(FavoriteRepository repository) {
+        this.repository = repository;
+    }
+
+    public List<FavoriteEntity> getAll(Integer userId) {
+        if (Objects.equals(userId, 0)) {
+            return repository.getAll();
+        }
+        return repository.getAll().stream()
+                .filter(item -> item.getUser().getId().equals(userId))
+                .toList();
+    }
+
+    public FavoriteEntity get(Integer id) {
+        return Optional.ofNullable(repository.get(id)).orElseThrow(() -> new NotFoundException(id));
+    }
+
+    public FavoriteEntity create(FavoriteEntity entity) {
+        return repository.create(entity);
+    }
+
+    public FavoriteEntity update(Integer id, FavoriteEntity entity) {
+        final FavoriteEntity exisEntity = get(id);
+        exisEntity.setUser(entity.getUser());
+        exisEntity.setMovie(entity.getMovie());
+        return repository.update(exisEntity);
+    }
+
+    public FavoriteEntity delete(Integer id) {
+        final FavoriteEntity exisEntity = get(id);
+        return repository.delete(exisEntity);
+    }
+}