feat: 멤버가 이벤트에 이미 참여했는 지 확인하는 API 구현

#182
woowacourse-teams · Aug 2, 2023 · a99fb4f · a99fb4f
1 parent c02271a
commit a99fb4f
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diff --git a/backend/emm-sale/src/main/java/com/emmsale/event/application/EventService.java b/backend/emm-sale/src/main/java/com/emmsale/event/application/EventService.java
@@ -251,6 +251,6 @@ private List<Tag> findAllPersistTagsOrElseThrow(final List<TagRequest> tags) {
   }
 
   public Boolean isAlreadyParticipate(final Long eventId, final Long memberId) {
-    return false;
+    return participantRepository.existsByEventIdAndMemberId(eventId, memberId);
   }
 }
diff --git a/backend/emm-sale/src/test/java/com/emmsale/event/application/EventServiceTest.java b/backend/emm-sale/src/test/java/com/emmsale/event/application/EventServiceTest.java
@@ -19,6 +19,7 @@
 import static com.emmsale.event.exception.EventExceptionType.NOT_FOUND_PARTICIPANT;
 import static com.emmsale.event.exception.EventExceptionType.NOT_FOUND_TAG;
 import static com.emmsale.event.exception.EventExceptionType.START_DATE_TIME_AFTER_END_DATE_TIME;
+import static com.emmsale.member.MemberFixture.memberFixture;
 import static com.emmsale.tag.TagFixture.AI;
 import static com.emmsale.tag.TagFixture.IOS;
 import static com.emmsale.tag.TagFixture.백엔드;
@@ -804,5 +805,38 @@ void deleteEventWithNotExistsEventTest() {
     }
   }
 
+  @Nested
+  @DisplayName("이벤트에 이미 참가한 멤버인지 확인할 수 있다.")
+  class isAlreadyParticipate {
+
+    @Test
+    @DisplayName("이벤트에 이미 참가한 경우 true를 반환한다.")
+    void alreadyParticipateThenTrue() {
+      //given
+      final Event 인프콘 = eventRepository.save(인프콘_2023());
+      final Member 멤버 = memberRepository.save(memberFixture());
+      eventService.participate(인프콘.getId(), 멤버.getId(), 멤버);
+
+      //when
+      final Boolean actual = eventService.isAlreadyParticipate(인프콘.getId(), 멤버.getId());
+
+      //then
+      assertThat(actual).isTrue();
+    }
+
+    @Test
+    @DisplayName("이벤트에 참가히자 않은 경우 false를 반환한다.")
+    void isNotAlreadyParticipateThenFalse() {
+      //given
+      final Event 인프콘 = eventRepository.save(인프콘_2023());
+      final Member 멤버 = memberRepository.save(memberFixture());
+
+      //when
+      final Boolean actual = eventService.isAlreadyParticipate(인프콘.getId(), 멤버.getId());
+
+      //then
+      assertThat(actual).isFalse();
+    }
+  }
 }