Feat: [FN-121] 그룹 내 멤버 조회 API 추가

.gitignore

@@ -5,6 +5,9 @@ build/
 !**/src/main/**/build/
 !**/src/test/**/build/
 
+### QueryDSL ###
+/src/main/generated/
+
 ### STS ###
 .apt_generated
 .classpath

build.gradle

@@ -51,6 +51,29 @@ dependencies {
 	testRuntimeOnly 'com.h2database:h2'
 	implementation platform('software.amazon.awssdk:bom:2.20.56')
 	implementation 'software.amazon.awssdk:s3'
+
+	implementation 'com.querydsl:querydsl-jpa:5.0.0:jakarta'
+	annotationProcessor "com.querydsl:querydsl-apt:5.0.0:jakarta"
+	annotationProcessor "jakarta.annotation:jakarta.annotation-api"
+	annotationProcessor "jakarta.persistence:jakarta.persistence-api"
+}
+
+def querydslDir = layout.buildDirectory.dir("generated/querydsl").get().asFile
+
+tasks.withType(JavaCompile).configureEach {
+	options.generatedSourceOutputDirectory.set(querydslDir)
+}
+
+sourceSets {
+	main {
+		java {
+			srcDir querydslDir
+		}
+	}
+}
+
+clean.doLast {
+	file(querydslDir).deleteDir()
 }
 
 tasks.named('test') {

src/main/java/project/flipnote/group/controller/GroupController.java

@@ -16,6 +16,8 @@
 import jakarta.validation.Valid;
 import lombok.RequiredArgsConstructor;
 import project.flipnote.common.security.dto.AuthPrinciple;
+import project.flipnote.group.model.FindGroupMemberResponse;
+import project.flipnote.group.model.FindGroupMemberResponse;
 import project.flipnote.group.model.GroupCreateRequest;
 import project.flipnote.group.model.GroupCreateResponse;
 import project.flipnote.group.model.GroupDetailResponse;
@@ -68,4 +70,14 @@ public ResponseEntity<Void> deleteGroup(
 
 		return ResponseEntity.noContent().build();
 	}
+
+	//그룹내 멤버 조회
+	@GetMapping("/{groupId}/members")
+	public ResponseEntity<FindGroupMemberResponse> findGroupMembers(
+		@AuthenticationPrincipal AuthPrinciple authPrinciple,
+		@PathVariable("groupId") Long groupId) {
+		FindGroupMemberResponse res = groupService.findGroupMembers(authPrinciple, groupId);
+
+		return ResponseEntity.ok(res);
+	}
 }

src/main/java/project/flipnote/group/model/FindGroupMemberResponse.java

@@ -0,0 +1,11 @@
+package project.flipnote.group.model;
+
+import java.util.List;
+
+public record FindGroupMemberResponse(
+	List<GroupMemberInfo> groupMembers
+) {
+	public static FindGroupMemberResponse from(List<GroupMemberInfo> groupMembers) {
+		return new FindGroupMemberResponse(groupMembers);
+	}
+}

src/main/java/project/flipnote/group/model/GroupMemberInfo.java

@@ -0,0 +1,14 @@
+package project.flipnote.group.model;
+
+import project.flipnote.group.entity.GroupMemberRole;
+
+public record GroupMemberInfo(
+	Long id,
+	GroupMemberRole role,
+	String name,
+	String profile
+) {
+	public static GroupMemberInfo from(Long id, GroupMemberRole role, String name, String profile) {
+		return new GroupMemberInfo(id, role, name, profile);
+	}
+}

src/main/java/project/flipnote/group/repository/GroupMemberRepository.java

@@ -12,7 +12,7 @@
 import project.flipnote.user.entity.UserProfile;
 
 @Repository
-public interface GroupMemberRepository extends JpaRepository<GroupMember, Long> {
+public interface GroupMemberRepository extends JpaRepository<GroupMember, Long>, GroupMemberRepositoryCustom {
 	Optional<GroupMember> findByGroupAndUser(Group group, UserProfile userProfile);
 
 	long countByGroup_Id(Long groupId);
@@ -24,4 +24,6 @@ public interface GroupMemberRepository extends JpaRepository<GroupMember, Long>
 	long countByGroup_idAndUser_idNot(Long groupId, Long userId);
 
 	List<GroupMember> findByGroupAndRoleIn(Group group, List<GroupMemberRole> roles);
+
+	boolean existsByGroup_IdAndUser_Id(Long groupId, Long id);
 }

src/main/java/project/flipnote/group/repository/GroupMemberRepositoryCustom.java

@@ -0,0 +1,9 @@
+package project.flipnote.group.repository;
+
+import java.util.List;
+
+import project.flipnote.group.model.GroupMemberInfo;
+
+public interface GroupMemberRepositoryCustom {
+	List<GroupMemberInfo> findGroupMembers(Long groupId);
+}

src/main/java/project/flipnote/group/repository/GroupMemberRepositoryImpl.java

@@ -0,0 +1,36 @@
+package project.flipnote.group.repository;
+
+import java.util.List;
+
+import com.querydsl.core.types.Projections;
+import com.querydsl.jpa.impl.JPAQuery;
+import com.querydsl.jpa.impl.JPAQueryFactory;
+
+import lombok.RequiredArgsConstructor;
+import project.flipnote.group.entity.QGroupMember;
+import project.flipnote.group.model.GroupMemberInfo;
+import project.flipnote.user.entity.QUserProfile;
+
+@RequiredArgsConstructor
+public class GroupMemberRepositoryImpl implements GroupMemberRepositoryCustom {
+
+	private final JPAQueryFactory queryFactory;
+
+	QUserProfile userProfile = QUserProfile.userProfile;
+	QGroupMember groupMember = QGroupMember.groupMember;
+
+	public List<GroupMemberInfo> findGroupMembers(Long groupId) {
+		return queryFactory.select(Projections.constructor(
+				GroupMemberInfo.class,
+				userProfile.id,
+				groupMember.role,
+				userProfile.name,
+				userProfile.profileImageUrl
+			))
+			.from(groupMember)
+			.join(groupMember.user, userProfile)
+			.where(groupMember.group.id.eq(groupId))
+			.fetch();
+	}
+
+}

src/main/java/project/flipnote/group/repository/GroupRepository.java

@@ -22,4 +22,6 @@ public interface GroupRepository extends JpaRepository<Group, Long> {
 
 	@Query("SELECT g.name FROM Group g WHERE g.id = :id")
 	Optional<String> findGroupNameById(@Param("id") Long id);
+
+	boolean existsByIdAndDeletedAtIsNull(Long groupId);
 }

src/main/java/project/flipnote/group/service/GroupService.java

@@ -18,9 +18,11 @@
 import project.flipnote.group.entity.GroupPermissionStatus;
 import project.flipnote.group.entity.GroupRolePermission;
 import project.flipnote.group.exception.GroupErrorCode;
+import project.flipnote.group.model.FindGroupMemberResponse;
 import project.flipnote.group.model.GroupCreateRequest;
 import project.flipnote.group.model.GroupCreateResponse;
 import project.flipnote.group.model.GroupDetailResponse;
+import project.flipnote.group.model.GroupMemberInfo;
 import project.flipnote.group.model.GroupPutRequest;
 import project.flipnote.group.model.GroupPutResponse;
 import project.flipnote.group.repository.GroupMemberRepository;
@@ -55,19 +57,37 @@ public UserProfile validateUser(AuthPrinciple authPrinciple) {
 		);
 	}
 
+	/*
+	그룹 내 유저 검증
+	 */
+	public void validateGroupInUser(UserProfile user, Long groupId) {
+		if(!groupMemberRepository.existsByGroup_IdAndUser_Id(groupId, user.getId())) {
+			throw new BizException(GroupJoinErrorCode.USER_NOT_IN_GROUP);
+		}
+	}
+
 	/*
 	그룹 내 유저 조회
 	 */
-	public GroupMember validateGroupInUser(UserProfile user, Long groupId) {
+	public GroupMember getGroupMember(UserProfile user, Long groupId) {
 		return groupMemberRepository.findByGroup_IdAndUser_Id(groupId, user.getId()).orElseThrow(
 			() -> new BizException(GroupJoinErrorCode.USER_NOT_IN_GROUP)
 		);
 	}
 
+	/*
+	그룹 검증
+	 */
+	public void validateGroup(Long groupId) {
+		if(!groupRepository.existsByIdAndDeletedAtIsNull(groupId)) {
+			throw new BizException(GroupErrorCode.GROUP_NOT_FOUND);
+		}
+	}
+
 	/*
 	그룹 조회
 	 */
-	public Group validateGroup(Long groupId) {
+	public Group getGroup(Long groupId) {
 		return groupRepository.findByIdAndDeletedAtIsNull(groupId).orElseThrow(
 			() -> new BizException(GroupErrorCode.GROUP_NOT_FOUND)
 		);
@@ -185,11 +205,11 @@ public GroupPutResponse changeGroup(AuthPrinciple authPrinciple, GroupPutRequest
 		//2. 인원수 검증
 		validateMaxMember(req.maxMember());
 
-		//3. 그룹 가져오기
-		Group group = validateGroup(groupId);
+		//3. 그룹 조회
+		validateGroup(groupId);
 
 		//4. 그룹 내 유저 조회
-		GroupMember groupMember = validateGroupInUser(user, groupId);
+		GroupMember groupMember = getGroupMember(user, groupId);
 
 		//5. 유저 권환 조회
 		if (!groupMember.getRole().equals(GroupMemberRole.OWNER)) {
@@ -212,13 +232,21 @@ private boolean checkUserNotExistInGroup(UserProfile user, Long groupId) {
 		return true;
 	}
 
+	/*
+	그룹 내 모든 멤버리스트 조회
+	 */
+	private List<GroupMemberInfo> findGroupMembers(Long groupId) {
+		//각 그룹멤버의 id를 가지고 유저를 찾고 유저명, 권한, 등등 가져오기
+		return groupMemberRepository.findGroupMembers(groupId);
+	}
+
 	/*
 	그룹 상세 정보 조회
 	 */
 	public GroupDetailResponse findGroupDetail(AuthPrinciple authPrinciple, Long groupId) {
 
 		//1. 그룹 조회
-		Group group = validateGroup(groupId);
+		Group group = getGroup(groupId);
 
 		//2. 유저 조회
 		UserProfile user = validateUser(authPrinciple);
@@ -233,13 +261,13 @@ public GroupDetailResponse findGroupDetail(AuthPrinciple authPrinciple, Long gro
 	@Transactional
 	public void deleteGroup(AuthPrinciple authPrinciple, Long groupId) {
 		//1. 그룹 조회
-		Group group = validateGroup(groupId);
+		Group group = getGroup(groupId);
 
 		//2. 유저 조회
 		UserProfile user = validateUser(authPrinciple);
 
 		//3. 그룹 내 유저 조회
-		GroupMember groupMember = validateGroupInUser(user, groupId);
+		GroupMember groupMember = getGroupMember(user, groupId);
 
 		//4. 유저 권환 조회
 		if (!groupMember.getRole().equals(GroupMemberRole.OWNER)) {
@@ -255,8 +283,26 @@ public void deleteGroup(AuthPrinciple authPrinciple, Long groupId) {
 
 	}
 
+	//그룹이름 찾는 메서드
 	public String findGroupName(Long groupId) {
 		return groupRepository.findGroupNameById(groupId)
 			.orElseThrow(() -> new BizException(GroupErrorCode.GROUP_NOT_FOUND));
 	}
+
+	//그룹 내 멤버 조회 메서드
+	public FindGroupMemberResponse findGroupMembers(AuthPrinciple authPrinciple, Long groupId) {
+		//1. 그룹 검증
+		validateGroup(groupId);
+
+		//2. 유저 조회
+		UserProfile user = validateUser(authPrinciple);
+
+		//3. 그룹 내 유저 조회
+		validateGroupInUser(user, groupId);
+
+		//4. 그룹 내 모든 유저 조회
+		List<GroupMemberInfo> groupMembers = findGroupMembers(groupId);
+
+		return FindGroupMemberResponse.from(groupMembers);
+	}
 }

src/main/java/project/flipnote/infra/config/QuerydslConfig.java

@@ -0,0 +1,20 @@
+package project.flipnote.infra.config;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+import com.querydsl.jpa.impl.JPAQueryFactory;
+
+import jakarta.persistence.EntityManager;
+import lombok.RequiredArgsConstructor;
+
+@Configuration
+@RequiredArgsConstructor
+public class QuerydslConfig {
+	private final EntityManager entityManager;
+
+	@Bean
+	public JPAQueryFactory jpaQueryFactory() {
+		return new JPAQueryFactory(entityManager);
+	}
+}