♻️ Refactor: 내가 받은 초대장 로직 수정

Author: koojun99

src/main/java/treehouse/server/api/invitation/business/InvitationService.java

@@ -51,6 +51,11 @@ public InvitationResponseDTO.getInvitations getInvitations(User user) {
         List<Invitation> invitations = invitationQueryAdapter.findAllByPhone(user.getPhone());
 
         List<InvitationResponseDTO.getInvitation> invitationDtos = invitations.stream()
+                // 초대장을 보낸 트리하우스에 이미 가입한 멤버는 제외
+                .filter(invitation ->
+                        invitation.getTreeHouse().getMemberList().stream()
+                                .noneMatch(member -> member.getUser().getId().equals(user.getId()))
+                )
                 .map(invitation -> {
                     TreeHouse treeHouse = invitation.getTreeHouse();
                     List<Member> treeMembers = treeHouse.getMemberList();

src/main/java/treehouse/server/api/invitation/implement/InvitationCommandAdapter.java

@@ -10,6 +10,7 @@
 import treehouse.server.global.entity.User.User;
 import treehouse.server.global.entity.User.UserRole;
 import treehouse.server.global.entity.redis.RefreshToken;
+import treehouse.server.global.entity.treeHouse.TreeHouse;
 import treehouse.server.global.redis.service.RedisService;
 import treehouse.server.global.security.jwt.dto.TokenDTO;
 import treehouse.server.global.security.provider.TokenProvider;

src/main/java/treehouse/server/global/exception/GlobalErrorCode.java

@@ -60,7 +60,7 @@ public enum GlobalErrorCode implements BaseErrorCode{
     INVITATION_NOT_FOUND(NOT_FOUND, "INVITATION404_1", "존재하지 않는 초대장입니다."),
 
     // INVITATION + 409 CONFLICT : Resource 를 찾을 수 없음
-    INVITATION_ALREADY_EXIST(CONFLICT, "INVITATION409_1", "이미 존재하는 초대장입니다."),
+    INVITATION_ALREADY_EXIST(CONFLICT, "INVITATION409_1", "이미 해당 트리하우스에 초대되었습니다."),
 
     // POST + 401 Unauthorized - 권한 없음
     POST_UNAUTHORIZED(UNAUTHORIZED, "POST401_1", "게시글 수정 및 삭제 권한이 없습니다."),