fix(channel-donation): 후원 메시지 회원 로딩을 보장한다

src/main/kotlin/kr/co/vividnext/sodalive/can/CanService.kt

@@ -6,10 +6,12 @@ import kr.co.vividnext.sodalive.common.CountryContext
 import kr.co.vividnext.sodalive.member.Member
 import org.springframework.data.domain.Pageable
 import org.springframework.stereotype.Service
+import org.springframework.transaction.annotation.Transactional
 import java.time.ZoneId
 import java.time.format.DateTimeFormatter
 
 @Service
+@Transactional(readOnly = true)
 class CanService(
     private val repository: CanRepository,
     private val countryContext: CountryContext

src/main/kotlin/kr/co/vividnext/sodalive/explorer/profile/channelDonation/ChannelDonationMessageRepository.kt

@@ -52,6 +52,7 @@ class ChannelDonationMessageQueryRepositoryImpl(
 
         return queryFactory
             .selectFrom(channelDonationMessage)
+            .leftJoin(channelDonationMessage.member).fetchJoin()
             .where(where)
             .offset(offset)
             .limit(limit)

src/main/kotlin/kr/co/vividnext/sodalive/explorer/profile/channelDonation/ChannelDonationService.kt

@@ -18,6 +18,7 @@ import java.time.format.DateTimeFormatter
 import java.time.temporal.TemporalAdjusters
 
 @Service
+@Transactional(readOnly = true)
 class ChannelDonationService(
     private val canPaymentService: CanPaymentService,
     private val memberRepository: MemberRepository,

src/test/kotlin/kr/co/vividnext/sodalive/can/CanServiceTest.kt

@@ -10,6 +10,7 @@ import org.junit.jupiter.api.Test
 import org.mockito.Mockito.mock
 import org.mockito.Mockito.`when`
 import org.springframework.data.domain.PageRequest
+import org.springframework.transaction.annotation.Transactional
 import java.time.LocalDateTime
 
 class CanServiceTest {
@@ -134,6 +135,14 @@ class CanServiceTest {
         assertEquals("캐릭터 톡 이용권 구매", result[5].title)
     }
 
+    @Test
+    @DisplayName("캔 서비스 조회 로직은 read-only 트랜잭션 경계에서 실행된다")
+    fun `should run can service queries in read only transaction`() {
+        val transactional = CanService::class.java.getAnnotation(Transactional::class.java)
+
+        assertEquals(true, transactional.readOnly)
+    }
+
     private fun createUseCanDto(
         usage: CanUsage,
         can: Int,

src/test/kotlin/kr/co/vividnext/sodalive/explorer/profile/channelDonation/ChannelDonationMessageRepositoryTest.kt

@@ -133,6 +133,37 @@ class ChannelDonationMessageRepositoryTest @Autowired constructor(
         assertEquals(3, totalCount)
     }
 
+    @Test
+    @DisplayName("목록 조회 시 후원자 회원 정보를 함께 로딩한다")
+    fun shouldFetchMemberWithDonationMessages() {
+        // given: 크리에이터/후원자와 조회 대상 메시지를 준비한다.
+        val creator = saveMember(nickname = "creator3", role = MemberRole.CREATOR)
+        val viewer = saveMember(nickname = "viewer3", role = MemberRole.USER)
+        val message = saveMessage(member = viewer, creator = creator, can = 1, isSecret = false)
+        val monthStart = LocalDateTime.now().withDayOfMonth(1).toLocalDate().atStartOfDay()
+        val nextMonthStart = monthStart.plusMonths(1)
+        updateCreatedAt(message.id!!, monthStart.plusDays(1))
+        entityManager.flush()
+        entityManager.clear()
+
+        // when: 목록을 조회한 뒤 영속성 컨텍스트를 비운다.
+        val list = channelDonationMessageRepository.getChannelDonationMessageList(
+            creatorId = creator.id!!,
+            memberId = viewer.id!!,
+            isCreator = false,
+            offset = 0,
+            limit = 10,
+            startDateTime = monthStart,
+            endDateTime = nextMonthStart
+        )
+        entityManager.clear()
+
+        // then: 조회 결과의 후원자 정보는 세션 없이도 접근 가능해야 한다.
+        assertEquals(1, list.size)
+        assertEquals(viewer.id, list[0].member!!.id)
+        assertEquals("viewer3", list[0].member!!.nickname)
+    }
+
     private fun saveMember(nickname: String, role: MemberRole): Member {
         return memberRepository.saveAndFlush(
             Member(