BugFix Stream for Article model.

00-backend/src/main/java/de/htwsaar/webshop/repository/ArticleRepository.java

@@ -3,6 +3,7 @@ package de.htwsaar.webshop.repository;
 import de.htwsaar.webshop.repository.entities.Article;
 import lombok.NonNull;
 import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
 import org.springframework.stereotype.Repository;
 
 import java.util.Optional;

00-backend/src/main/java/de/htwsaar/webshop/repository/ReviewRepository.java

@@ -1,17 +1,18 @@
 package de.htwsaar.webshop.repository;
 
+import java.util.List;
+import java.util.stream.Stream;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
 import de.htwsaar.webshop.repository.entities.Review;
 import jakarta.validation.constraints.NotNull;
 import jakarta.validation.constraints.Positive;
-import org.springframework.data.jpa.repository.JpaRepository;
-import org.springframework.stereotype.Repository;
-
-import java.util.List;
-import java.util.stream.Stream;
 
 @Repository
 public interface ReviewRepository extends JpaRepository<Review, Long> {
     Stream<Review> streamReviewsByArticleId(@NotNull @Positive Long id);
 
-    List<Review> getReviewsByArticle_Id(Long articleId);
+    List<Review> getReviewsByArticleId(Long articleId);
 }

00-backend/src/main/java/de/htwsaar/webshop/repository/entities/Article.java

@@ -7,7 +7,10 @@ import lombok.AllArgsConstructor;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
 import lombok.Setter;
+import lombok.ToString;
 
+import java.util.ArrayList;
+import java.util.List;
 import java.util.UUID;
 
 @Getter
@@ -16,6 +19,7 @@ import java.util.UUID;
 @NoArgsConstructor
 @Entity
 @Table(name = "Articles")
+@ToString
 public class Article {
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
@@ -46,4 +50,7 @@ public class Article {
 
     @Column(name = "category", nullable = false)
     private String category;
+
+    @OneToMany(mappedBy = "article", cascade = CascadeType.ALL, orphanRemoval = true, fetch = FetchType.EAGER)
+    private List<Review> reviews = new ArrayList<>();
 }

00-backend/src/main/java/de/htwsaar/webshop/repository/entities/Review.java

@@ -23,8 +23,8 @@ public class Review {
     @Column(name = "content", nullable = false)
     private String content;
 
-    @ManyToOne(fetch = FetchType.LAZY)
-    @JoinColumn(name = "articleId", referencedColumnName = "id", nullable = false)
+    @ManyToOne(fetch = FetchType.EAGER)
+    @JoinColumn(name = "article_id", nullable = false)
     private Article article;
 
     @PositiveOrZero

00-backend/src/main/java/de/htwsaar/webshop/service/impl/ArticleServiceImpl.java

@@ -6,6 +6,7 @@ import de.htwsaar.webshop.repository.ReviewRepository;
 import de.htwsaar.webshop.repository.entities.Article;
 import de.htwsaar.webshop.repository.entities.Review;
 import de.htwsaar.webshop.service.ArticleService;
+import jakarta.transaction.Transactional;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
@@ -56,7 +57,10 @@ public class ArticleServiceImpl implements ArticleService {
     }
 
     @Override
+    @Transactional
     public Article save(Article article) {
+        article.setId(null);
+        article.setUuid(UUID.randomUUID());
         return articleRepository.save(article);
     }
 
@@ -64,10 +68,12 @@ public class ArticleServiceImpl implements ArticleService {
     public double getRating(Long id) {
         return reviewRepository.streamReviewsByArticleId(id)
                 .mapToInt(Review::getRating)
-                .average().orElse(-1);
+                .average()
+                .orElse(-1);
     }
 
     @Override
+    @Transactional
     public double getRating(UUID uuid) {
         return reviewRepository.streamReviewsByArticleId(
                 articleRepository.findArticleByUuid(uuid).orElseThrow().getId()
@@ -85,10 +91,17 @@ public class ArticleServiceImpl implements ArticleService {
                 article.getDiscount100(),
                 article.getStock(),
                 article.getCategory(),
-                getRating(article.getId())
+                calculateAverageRating(article.getReviews())
         );
     }
 
+    private double calculateAverageRating(List<Review> reviews) {
+        return reviews.stream()
+                .mapToInt(Review::getRating)
+                .average()
+                .orElse(-1);
+    }
+
     @Override
     public List<ArticleModel> from(List<Article> articles) {
         return articles.stream().map(this::from).toList();

00-backend/src/main/java/de/htwsaar/webshop/service/impl/ReviewServiceImpl.java

@@ -36,6 +36,6 @@ public class ReviewServiceImpl implements ReviewService {
 
     @Override
     public List<Review> getAllByArticleId(Long articleId) {
-        return reviewRepository.getReviewsByArticle_Id(articleId);
+        return reviewRepository.getReviewsByArticleId(articleId);
     }
 }