Summary 선택 상태(selected) 수정

src/main/java/com/sofa/linkiving/domain/link/entity/Summary.java

@@ -28,14 +28,14 @@ public class Summary extends BaseEntity {
 	@Column(columnDefinition = "TEXT", nullable = false)
 	private String content;
 
-	@Column(name = "selected")
+	@Column(nullable = false)
 	private boolean selected;
 
 	@Builder
-	public Summary(Link link, Format format, String content, boolean select) {
+	public Summary(Link link, Format format, String content, Boolean selected) {
 		this.link = link;
 		this.format = format;
 		this.content = content;
-		this.selected = select;
+		this.selected = selected != null && selected;
 	}
 }

src/main/java/com/sofa/linkiving/domain/link/repository/SummaryRepository.java

@@ -1,8 +1,10 @@
 package com.sofa.linkiving.domain.link.repository;
 
 import java.util.List;
+import java.util.Optional;
 
 import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Modifying;
 import org.springframework.data.jpa.repository.Query;
 import org.springframework.data.repository.query.Param;
 import org.springframework.stereotype.Repository;
@@ -12,6 +14,19 @@
 
 @Repository
 public interface SummaryRepository extends JpaRepository<Summary, Long> {
+
+	Optional<Summary> findByLinkIdAndSelectedTrue(Long linkId);
+
+	boolean existsByLinkIdAndSelectedTrue(Long linkId);
+
+	@Modifying(clearAutomatically = true, flushAutomatically = true)
+	@Query("update Summary s set s.selected = false where s.link.id = :linkId and s.selected = true")
+	int clearSelectedByLinkId(@Param("linkId") Long linkId);
+
+	@Modifying(clearAutomatically = true, flushAutomatically = true)
+	@Query("update Summary s set s.selected = true where s.id = :summaryId and s.link.id = :linkId")
+	int selectByIdAndLinkId(@Param("summaryId") Long summaryId, @Param("linkId") Long linkId);
+
 	@Query("SELECT s FROM Summary s WHERE s.link IN :links AND s.selected = true")
 	List<Summary> findAllByLinkInAndSelectedTrue(@Param("links") List<Link> links);
 }

src/main/java/com/sofa/linkiving/domain/link/service/SummaryCommandService.java

@@ -0,0 +1,28 @@
+package com.sofa.linkiving.domain.link.service;
+
+import org.springframework.stereotype.Service;
+
+import com.sofa.linkiving.domain.link.error.LinkErrorCode;
+import com.sofa.linkiving.domain.link.repository.SummaryRepository;
+import com.sofa.linkiving.global.error.exception.BusinessException;
+
+import lombok.RequiredArgsConstructor;
+
+@Service
+@RequiredArgsConstructor
+public class SummaryCommandService {
+
+	private final SummaryRepository summaryRepository;
+
+	/**
+	 * 특정 링크에서 선택된 요약을 변경한다. (링크당 selected=true는 최대 1개)
+	 */
+	public void selectSummary(Long linkId, Long summaryId) {
+		summaryRepository.clearSelectedByLinkId(linkId);
+		int updated = summaryRepository.selectByIdAndLinkId(summaryId, linkId);
+		if (updated == 0) {
+			throw new BusinessException(LinkErrorCode.SUMMARY_NOT_FOUND);
+		}
+	}
+}
+

src/main/java/com/sofa/linkiving/domain/link/service/SummaryQueryService.java

@@ -21,7 +21,7 @@ public class SummaryQueryService {
 	private final SummaryRepository summaryRepository;
 
 	public Summary getSummary(Long linkId) {
-		return summaryRepository.findById(linkId).orElseThrow(
+		return summaryRepository.findByLinkIdAndSelectedTrue(linkId).orElseThrow(
 			() -> new BusinessException(LinkErrorCode.SUMMARY_NOT_FOUND)
 		);
 	}

src/main/java/com/sofa/linkiving/domain/link/worker/SummaryWorker.java

@@ -116,10 +116,12 @@ public void generateAndSaveSummary(Long linkId) {
 		log.info("Summary generated for linkId: {}", linkId);
 
 		// 3. Summary 엔티티 생성 및 저장
+		boolean isFirstSummary = !summaryRepository.existsByLinkIdAndSelectedTrue(linkId);
 		Summary summary = Summary.builder()
 			.link(link)
 			.format(Format.CONCISE)
 			.content(response.summary())
+			.selected(isFirstSummary)
 			.build();
 
 		summaryRepository.save(summary);

src/test/java/com/sofa/linkiving/domain/chat/integration/ChatApiIntegrationTest.java

@@ -113,7 +113,7 @@ void shouldGetMessagesWithLinksAndSummaries() {
 		summaryRepository.save(Summary.builder()
 			.link(link1)
 			.content("링크1의 핵심 요약입니다.")
-			.select(true)
+			.selected(true)
 			.build());
 
 		Chat chat = chatRepository.save(com.sofa.linkiving.domain.chat.entity.Chat.builder()

src/test/java/com/sofa/linkiving/domain/link/entity/SummaryTest.java

@@ -55,17 +55,18 @@ void shouldCreateSummaryWithAllFields() {
 
 		Format format = Format.DETAILED;
 		String content = "This is a detailed summary";
-		boolean select = true;
+		boolean selected = true;
 
 		Summary summary = Summary.builder()
 			.link(link)
 			.format(format)
 			.content(content)
-			.select(select)
+			.selected(selected)
 			.build();
 
 		assertThat(summary.getLink()).isEqualTo(link);
 		assertThat(summary.getContent()).isEqualTo(content);
 		assertThat(summary.getFormat()).isEqualTo(format);
+		assertThat(summary.isSelected()).isTrue();
 	}
 }

src/test/java/com/sofa/linkiving/domain/link/integration/LinkApiIntegrationTest.java

@@ -170,7 +170,7 @@ void shouldGetLinkSuccessfully() throws Exception {
 			.link(link)
 			.content("이것은 요약 내용입니다.")
 			.format(Format.CONCISE)
-			.select(true)
+			.selected(true)
 			.build());
 
 		// when & then
@@ -335,7 +335,7 @@ void shouldGetLinkListSuccessfully() throws Exception {
 			.link(link2)
 			.content("링크 2 요약")
 			.format(Format.CONCISE)
-			.select(true)
+			.selected(true)
 			.build());
 
 		// when & then
@@ -628,6 +628,7 @@ void shouldRecreateSummarySuccessfully() throws Exception {
 		summaryRepository.save(Summary.builder()
 			.link(savedLink)
 			.content("기존 요약입니다.")
+			.selected(true)
 			.build());
 
 		String newSummaryText = "새로 생성된 상세 요약입니다.";

src/test/java/com/sofa/linkiving/domain/link/repository/LinkRepositoryTest.java

@@ -123,15 +123,15 @@ void shouldFindByIdAndMemberWithSummary() {
 			.link(link)
 			.content("선택된 요약 내용")
 			.format(Format.CONCISE)
-			.select(true)
+			.selected(true)
 			.build();
 		entityManager.persist(selectedSummary);
 
 		Summary otherSummary = Summary.builder()
 			.link(link)
 			.content("다른 요약")
 			.format(Format.CONCISE)
-			.select(false)
+			.selected(false)
 			.build();
 		entityManager.persist(otherSummary);
 
@@ -167,7 +167,7 @@ void shouldFindAllByMemberWithSummaryAndCursor() {
 					.link(link)
 					.content("요약 " + i)
 					.format(Format.CONCISE)
-					.select(true)
+					.selected(true)
 					.build();
 				entityManager.persist(summary);
 			}

src/test/java/com/sofa/linkiving/domain/link/repository/SummaryRepositoryTest.java

@@ -59,18 +59,18 @@ void shouldFindAllByLinkInAndSelectedTrue() {
 		Summary summary1 = Summary.builder()
 			.link(link1)
 			.content("s1")
-			.select(true)
+			.selected(true)
 			.build();
 		Summary summary2 = Summary.builder()
 			.link(link2)
 			.content("s2")
-			.select(false)
+			.selected(false)
 			.build();
 		Summary summary3 = Summary
 			.builder()
 			.link(link3)
 			.content("s3")
-			.select(true)
+			.selected(true)
 			.build();
 
 		em.persist(summary1);
@@ -109,7 +109,7 @@ void shouldReturnEmptyWhenLinkListIsEmpty() {
 		Summary summary = Summary.builder()
 			.link(link)
 			.content("s1")
-			.select(true)
+			.selected(true)
 			.build();
 		em.persist(summary);
 

src/test/java/com/sofa/linkiving/domain/link/service/SummaryCommandServiceTest.java

@@ -0,0 +1,61 @@
+package com.sofa.linkiving.domain.link.service;
+
+import static org.assertj.core.api.Assertions.*;
+import static org.mockito.BDDMockito.*;
+
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import com.sofa.linkiving.domain.link.error.LinkErrorCode;
+import com.sofa.linkiving.domain.link.repository.SummaryRepository;
+import com.sofa.linkiving.global.error.exception.BusinessException;
+
+@ExtendWith(MockitoExtension.class)
+@DisplayName("SummaryCommandService 단위 테스트")
+public class SummaryCommandServiceTest {
+
+	@Mock
+	private SummaryRepository summaryRepository;
+
+	@InjectMocks
+	private SummaryCommandService summaryCommandService;
+
+	@Test
+	@DisplayName("요약 선택 변경 성공")
+	void shouldSelectSummarySuccessfully() {
+		// given
+		Long linkId = 1L;
+		Long summaryId = 2L;
+		given(summaryRepository.clearSelectedByLinkId(linkId)).willReturn(1);
+		given(summaryRepository.selectByIdAndLinkId(summaryId, linkId)).willReturn(1);
+
+		// when
+		summaryCommandService.selectSummary(linkId, summaryId);
+
+		// then
+		verify(summaryRepository).clearSelectedByLinkId(linkId);
+		verify(summaryRepository).selectByIdAndLinkId(summaryId, linkId);
+	}
+
+	@Test
+	@DisplayName("존재하지 않는 요약 선택 시 예외 발생")
+	void shouldThrowExceptionWhenSummaryNotFound() {
+		// given
+		Long linkId = 1L;
+		Long summaryId = 999L;
+		given(summaryRepository.clearSelectedByLinkId(linkId)).willReturn(1);
+		given(summaryRepository.selectByIdAndLinkId(summaryId, linkId)).willReturn(0);
+
+		// when & then
+		assertThatThrownBy(() -> summaryCommandService.selectSummary(linkId, summaryId))
+			.isInstanceOf(BusinessException.class)
+			.hasFieldOrPropertyWithValue("errorCode", LinkErrorCode.SUMMARY_NOT_FOUND);
+
+		verify(summaryRepository).clearSelectedByLinkId(linkId);
+		verify(summaryRepository).selectByIdAndLinkId(summaryId, linkId);
+	}
+}

src/test/java/com/sofa/linkiving/domain/link/service/SummaryQueryServiceTest.java

@@ -36,30 +36,30 @@ void shouldReturnSummaryWhenSummaryExists() {
 		// given
 		Long linkId = 1L;
 		Summary mockSummary = mock(Summary.class); // Summary 엔티티 Mock
-		given(summaryRepository.findById(linkId)).willReturn(Optional.of(mockSummary));
+		given(summaryRepository.findByLinkIdAndSelectedTrue(linkId)).willReturn(Optional.of(mockSummary));
 
 		// when
 		Summary result = summaryQueryService.getSummary(linkId);
 
 		// then
 		assertThat(result).isNotNull();
 		assertThat(result).isEqualTo(mockSummary);
-		verify(summaryRepository).findById(linkId);
+		verify(summaryRepository).findByLinkIdAndSelectedTrue(linkId);
 	}
 
 	@Test
 	@DisplayName("요약 정보를 찾을 수 없을 때 BusinessException(SUMMARY_NOT_FOUND) 발생")
 	void shouldThrowBusinessExceptionWhenSummaryNotFound() {
 		// given
 		Long linkId = 999L;
-		given(summaryRepository.findById(linkId)).willReturn(Optional.empty());
+		given(summaryRepository.findByLinkIdAndSelectedTrue(linkId)).willReturn(Optional.empty());
 
 		// when & then
 		assertThatThrownBy(() -> summaryQueryService.getSummary(linkId))
 			.isInstanceOf(BusinessException.class)
 			.hasFieldOrPropertyWithValue("errorCode", LinkErrorCode.SUMMARY_NOT_FOUND);
 
-		verify(summaryRepository).findById(linkId);
+		verify(summaryRepository).findByLinkIdAndSelectedTrue(linkId);
 	}
 
 	@Test