btsk-116: readme작성 및 삭제 관련 에러 해결 (#152)

* feat: readme작성 및 삭제 관련 에러 해결

* fix: 테스트 코드 및 리뷰 반영

Author: Hyeonjun0527

README.md

@@ -3,6 +3,7 @@
 import java.io.IOException;
 import java.io.InputStream;
 import java.nio.file.Path;
+import java.util.HashSet;
 import java.util.List;
 import java.util.Optional;
 import kr.it.pullit.modules.learningsource.source.api.SourcePublicApi;
@@ -147,9 +148,14 @@ public List<Source> findByIdIn(List<Long> ids) {
   @Override
   public void deleteSource(Long sourceId, Long memberId) {
     Source source = getOrElseThrow(sourceId, memberId);
-    String filePath = source.getFilePath();
+
+    new HashSet<>(source.getQuestionSets())
+        .forEach(questionSet -> questionSet.removeSource(source));
+    source.getQuestionSets().clear();
 
     sourceRepository.delete(source);
+
+    String filePath = source.getFilePath();
     deleteInS3(filePath);
   }
 

docs/architecture.png

@@ -9,5 +9,7 @@ public interface LearnStatsPublicApi {
 
   void applyQuestionSetSolved(Long memberId, int questionCount);
 
+  void applyQuestionSetDeleted(Long memberId, long correctQuestionCount);
+
   Optional<LearnStats> getLearnStats(Long memberId);
 }

docs/erd.png

@@ -81,6 +81,11 @@ public void onQuestionSetSolved(int solvedQuestionCount, LocalDate today) {
     updateConsecutiveStreak(today);
   }
 
+  public void onQuestionSetDeleted(long correctQuestionsInSet) {
+    this.totalCorrectQuestionCount =
+        Math.max(0, this.totalCorrectQuestionCount - correctQuestionsInSet);
+  }
+
   public void updateTotalQuestionCount(long totalQuestionCount) {
     this.totalQuestionCount = totalQuestionCount;
   }

docs/grafana.png

@@ -32,6 +32,16 @@ public void applyQuestionSetSolved(Long memberId, int questionCount) {
     repo.save(p);
   }
 
+  @Override
+  public void applyQuestionSetDeleted(Long memberId, long correctQuestionCount) {
+    repo.findById(memberId)
+        .ifPresent(
+            learnStats -> {
+              learnStats.onQuestionSetDeleted(correctQuestionCount);
+              repo.save(learnStats);
+            });
+  }
+
   public void increaseCorrectQuestionCount(Long memberId, long correctCount) {
     LearnStats p = repo.findById(memberId).orElseGet(() -> LearnStats.newOf(memberId));
     p.increaseCorrectQuestionCount(correctCount);