참여자 닉네임 생성, 모임의 참여자 조회 기능 생성

backend/src/main/java/mouda/backend/member/domain/Member.java

@@ -0,0 +1,36 @@
+package mouda.backend.member.domain;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.ManyToOne;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import mouda.backend.moim.domain.Moim;
+
+@Entity
+@Getter
+@NoArgsConstructor
+public class Member {
+
+	@Id
+	@GeneratedValue(strategy = GenerationType.IDENTITY)
+	private Long id;
+
+	private String nickName;
+
+	@ManyToOne(fetch = FetchType.LAZY)
+	private Moim moim;
+
+	@Builder
+	public Member(String nickName) {
+		this.nickName = nickName;
+	}
+
+	public void joinMoim(Moim moim) {
+		this.moim = moim;
+	}
+}

backend/src/main/java/mouda/backend/member/repository/MemberRepository.java

@@ -0,0 +1,14 @@
+package mouda.backend.member.repository;
+
+import java.util.List;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
+
+import mouda.backend.member.domain.Member;
+
+public interface MemberRepository extends JpaRepository<Member, Long> {
+
+	@Query("SELECT m.nickName FROM Member m WHERE m.moim.id = :moimId")
+	List<String> findNickNamesByMoimId(long moimId);
+}

backend/src/main/java/mouda/backend/moim/dto/request/MoimJoinRequest.java

@@ -1,6 +1,7 @@
 package mouda.backend.moim.dto.request;
 
 public record MoimJoinRequest(
-	Long moimId
+	Long moimId,
+	String nickName
 ) {
 }

backend/src/main/java/mouda/backend/moim/dto/response/MoimDetailsFindResponse.java

@@ -2,6 +2,7 @@
 
 import java.time.LocalDate;
 import java.time.LocalTime;
+import java.util.List;
 
 import lombok.Builder;
 import mouda.backend.moim.domain.Moim;
@@ -15,10 +16,11 @@ public record MoimDetailsFindResponse(
 	int currentPeople,
 	int maxPeople,
 	String authorNickname,
-	String description
+	String description,
+	List<String> participants
 ) {
 
-	public static MoimDetailsFindResponse toResponse(Moim moim) {
+	public static MoimDetailsFindResponse toResponse(Moim moim, List<String> participants) {
 		return MoimDetailsFindResponse.builder()
 			.title(moim.getTitle())
 			.date(moim.getDate())
@@ -28,6 +30,7 @@ public static MoimDetailsFindResponse toResponse(Moim moim) {
 			.maxPeople(moim.getMaxPeople())
 			.authorNickname(moim.getAuthorNickname())
 			.description(moim.getDescription())
+			.participants(participants)
 			.build();
 	}
 }

backend/src/main/java/mouda/backend/moim/service/MoimService.java

@@ -7,6 +7,8 @@
 import org.springframework.transaction.annotation.Transactional;
 
 import lombok.RequiredArgsConstructor;
+import mouda.backend.member.domain.Member;
+import mouda.backend.member.repository.MemberRepository;
 import mouda.backend.moim.domain.Moim;
 import mouda.backend.moim.dto.request.MoimCreateRequest;
 import mouda.backend.moim.dto.request.MoimJoinRequest;
@@ -24,6 +26,8 @@ public class MoimService {
 
 	private final MoimRepository moimRepository;
 
+	private final MemberRepository memberRepository;
+
 	public Moim createMoim(MoimCreateRequest moimCreateRequest) {
 		return moimRepository.save(moimCreateRequest.toEntity());
 	}
@@ -43,12 +47,18 @@ public MoimDetailsFindResponse findMoimDetails(long id) {
 		Moim moim = moimRepository.findById(id)
 			.orElseThrow(() -> new MoimException(HttpStatus.NOT_FOUND, MoimErrorMessage.NOT_FOUND));
 
-		return MoimDetailsFindResponse.toResponse(moim);
+		List<String> participants = memberRepository.findNickNamesByMoimId(id);
+
+		return MoimDetailsFindResponse.toResponse(moim, participants);
 	}
 
 	public void joinMoim(MoimJoinRequest moimJoinRequest) {
+		Member member = new Member(moimJoinRequest.nickName());
+
 		Moim moim = moimRepository.findById(moimJoinRequest.moimId())
 			.orElseThrow(() -> new MoimException(HttpStatus.NOT_FOUND, MoimErrorMessage.NOT_FOUND));
+		member.joinMoim(moim);
+		memberRepository.save(member);
 		moim.join();
 	}
 

backend/src/test/java/mouda/backend/member/repository/MemberRepositoryTest.java

@@ -0,0 +1,39 @@
+package mouda.backend.member.repository;
+
+import java.util.List;
+
+import org.assertj.core.api.Assertions;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+
+import mouda.backend.member.domain.Member;
+import mouda.backend.moim.domain.Moim;
+import mouda.backend.moim.repository.MoimRepository;
+
+@SpringBootTest
+class MemberRepositoryTest {
+
+	@Autowired
+	private MemberRepository memberRepository;
+
+	@Autowired
+	private MoimRepository moimRepository;
+
+	@DisplayName("모임에 가입된 맴버의 이름을 반환한다.")
+	@Test
+	void findNickNamesByMoimId() {
+		Member member = new Member("tehah");
+		Moim moim = new Moim().builder()
+			.build();
+		Moim saveMoim = moimRepository.save(moim);
+		member.joinMoim(moim);
+		memberRepository.save(member);
+
+		List<String> participants = memberRepository.findNickNamesByMoimId(saveMoim.getId());
+
+		Assertions.assertThat(participants.size()).isEqualTo(1);
+	}
+
+}

backend/src/test/java/mouda/backend/moim/service/MoimServiceTest.java

@@ -7,7 +7,6 @@
 import java.util.List;
 import java.util.Optional;
 
-import org.assertj.core.api.Assertions;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
@@ -87,7 +86,7 @@ void joinMoim() {
 		);
 		moimService.createMoim(moimCreateRequest);
 
-		MoimJoinRequest moimJoinRequest = new MoimJoinRequest(1L);
+		MoimJoinRequest moimJoinRequest = new MoimJoinRequest(1L, "호기");
 		moimService.joinMoim(moimJoinRequest);
 
 		Optional<Moim> moimOptional = moimRepository.findById(1L);