Returns comments sorted by latest first

src/main/kotlin/io/realworld/repository/CommentRepository.kt

@@ -8,4 +8,5 @@ import org.springframework.stereotype.Repository
 @Repository
 interface CommentRepository : CrudRepository<Comment, Long> {
     fun findByArticle(article: Article): List<Comment>
+    fun findByArticleOrderByCreatedAtDesc(article: Article): List<Comment>
 }
\ No newline at end of file

src/main/kotlin/io/realworld/web/ArticleHandler.kt

@@ -164,7 +164,7 @@ class ArticleHandler(val repository: ArticleRepository,
     fun articleComments(@PathVariable slug: String): Any {
         repository.findBySlug(slug)?.let {
             val currentUser = userService.currentUser()
-            return commentsView(commentRepository.findByArticle(it), currentUser)
+            return commentsView(commentRepository.findByArticleOrderByCreatedAtDesc(it), currentUser)
         }
         throw NotFoundException()
     }