feat: 'unFavorite Article' Controller, Service, Repository Implement.

src/main/java/com/io/realworld/domain/aggregate/article/controller/ArticleController.java

@@ -52,4 +52,9 @@ public class ArticleController {
     public ArticleResponse favoriteArticle(@AuthenticationPrincipal UserAuth userAuth, @PathVariable("slug") String slug){
         return articleService.favoriteArticle(userAuth, slug);
     }
+
+    @DeleteMapping("/{slug}/favorite")
+    public ArticleResponse unFavoriteArticle(@AuthenticationPrincipal UserAuth userAuth, @PathVariable("slug") String slug){
+        return articleService.unFavoriteArticle(userAuth, slug);
+    }
 }

src/main/java/com/io/realworld/domain/aggregate/article/service/ArticleService.java

@@ -21,4 +21,6 @@ public interface ArticleService {
     void deleteArticle(UserAuth userAuth, String slug);
 
     ArticleResponse favoriteArticle(UserAuth userAuth, String slug);
+
+    ArticleResponse unFavoriteArticle(UserAuth userAuth, String slug);
 }

src/main/java/com/io/realworld/domain/aggregate/article/service/ArticleServiceImpl.java

@@ -122,6 +122,25 @@ public class ArticleServiceImpl implements ArticleService {
 
     }
 
+    @Override
+    public ArticleResponse unFavoriteArticle(UserAuth userAuth, String slug) {
+        Optional<Article> article = articleRepository.findAll().stream().filter(findArticle ->
+                findArticle.getSlug().equals(slug)).findAny();
+        Optional<User> user = userRepository.findById(userAuth.getId());
+        if(article.isEmpty()){
+            throw new CustomException(Error.ARTICLE_NOT_FOUND);
+        }
+        if(user.isEmpty()){
+            throw new CustomException(Error.USER_NOT_FOUND);
+        }
+
+        Favorite favorite = favoriteRepository.findByArticleIdAndUserId(article.get().getId(), userAuth.getId()).orElseThrow(() -> {
+            throw new CustomException(Error.ALREADY_UN_FAVORITE_ARTICLE);
+        });
+        favoriteRepository.delete(favorite);
+        return convertDtoWithUser(article.get(),userAuth);
+    }
+
     private String initSlug(String title) {
         return title.toLowerCase().replace(' ', '-');
     }

src/main/java/com/io/realworld/exception/Error.java

@@ -12,7 +12,8 @@ public enum Error {
     ALREADY_FOLLOW("already follow",HttpStatus.UNPROCESSABLE_ENTITY),
     ALREADY_UNFOLLOW("already unfollow",HttpStatus.UNPROCESSABLE_ENTITY),
     ARTICLE_NOT_FOUND("article not found check your slug", HttpStatus.NOT_FOUND),
-    ALREADY_FAVORITE_ARTICLE("already favorite Aritlce", HttpStatus.UNPROCESSABLE_ENTITY);
+    ALREADY_FAVORITE_ARTICLE("already favorite Article", HttpStatus.UNPROCESSABLE_ENTITY),
+    ALREADY_UN_FAVORITE_ARTICLE("already unfavorite Article", HttpStatus.UNPROCESSABLE_ENTITY);
 
 
     private final String message;