RINGUS-62 fix: 로그인 아닐 때 멘토 목록 조회 안되는 오류 수정

src/main/java/es/princip/ringus/application/mentor/service/MentorService.java

@@ -55,11 +55,13 @@ public Long edit(Long memberId, EditMentorRequest request) {
     }
 
     public CursorResponse<MentorCardResponse> getMentorBy(CursorRequest request, Pageable pageable, Long memberId) {
-        Member member = memberRepository.findById(memberId)
+        if(request.isBookmarked()) {
+            Member member = memberRepository.findById(memberId)
                 .orElseThrow(() -> new CustomRuntimeException(MemberErrorCode.MEMBER_NOT_FOUND));
 
-        if (member.getMemberType().equals(MemberType.ROLE_MENTEE)) {
-            throw new CustomRuntimeException(MemberErrorCode.MEMBER_TYPE_DIFFERENT);
+            if (member.isNotMentee()) {
+                throw new CustomRuntimeException(MemberErrorCode.MEMBER_TYPE_DIFFERENT);
+            }
         }
 
         final Slice<MentorCardResponse> response = mentorRepository.findMentorBy(request, pageable, memberId);

src/main/java/es/princip/ringus/domain/mentor/MentorQueryDslRepositoryImpl.java

@@ -57,7 +57,7 @@ private List<Tuple> fetchMentor(
 
     private List<MentorCardResponse> fetchContent(
             final Pageable pageable,
-            final  Long cursor,
+            final Long cursor,
             final Boolean bookmared,
             final Long memberId
     ) {

src/main/java/es/princip/ringus/presentation/mentor/MentorController.java

@@ -10,6 +10,7 @@
 import jakarta.servlet.http.HttpServletRequest;
 import jakarta.servlet.http.HttpServletResponse;
 import jakarta.validation.Valid;
+import java.util.Optional;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.data.domain.Pageable;
@@ -54,11 +55,11 @@ public ResponseEntity<ApiResponseWrapper<CursorResponse<MentorCardResponse>>> ge
             HttpServletRequest httpServletRequest,
             HttpServletResponse httpServletResponse
     ) {
-        Long memberId = null;
 
-        if (request.isBookmarked()){
-            memberId = SessionToMemberId.getSessionMemberId(httpServletRequest,httpServletResponse);
-        }
+        Long memberId = Optional.ofNullable(request)
+            .filter(CursorRequest::isBookmarked)
+            .map(req -> SessionToMemberId.getSessionMemberId(httpServletRequest, httpServletResponse))
+            .orElse(null);
 
         log.info(request.toString());
         log.info(pageable.toString());