Repository: BremenMusicians/WeMeet_BE
Pull request #113: chore :: [#112] update myfriend response
Author: login: meltapplee
Created: 2025-05-12T12:36:00Z | Merged: 2025-05-13T05:14:46Z

<img width="616" alt="스크린샷 2025-05-12 21 35 31" src="https://github.com/user-attachments/assets/281eba34-b684-4b24-907e-88439417a3a1" />
close #112 

<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit

- **신규 기능**
  - 친구 목록 조회 시 각 친구의 이메일, 친구 상태, 포지션, 프로필, 자기소개, 채팅방 ID 등 상세 정보가 포함되어 제공됩니다.
  - 사용자와 친구들 간의 채팅 정보를 한 번에 조회하는 기능이 추가되었습니다.

- **변경 사항**
  - 친구 목록 응답 구조가 변경되어, 친구 수(friendsCnt)와 함께 각 친구의 상세 정보가 새로운 형식으로 반환됩니다.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Linked issue #112: 내친구 목록 반환시 메일과 chatId 추가
### Describe

_No response_

### Work

_No response_

### Additional

_No response_

Diff:
diff --git a/src/main/kotlin/dsm/wemeet/domain/chat/repository/ChatJpaRepository.kt b/src/main/kotlin/dsm/wemeet/domain/chat/repository/ChatJpaRepository.kt
index 119d221..cc5b590 100644
--- a/src/main/kotlin/dsm/wemeet/domain/chat/repository/ChatJpaRepository.kt
+++ b/src/main/kotlin/dsm/wemeet/domain/chat/repository/ChatJpaRepository.kt
@@ -28,4 +28,17 @@ interface ChatJpaRepository : JpaRepository<Chat, UUID> {
         """
     )
     fun findChatsByUserOrderByRecent(@Param("email") user: String): List<Chat>
+
+    @Query(
+        """
+    SELECT c FROM Chat c 
+    WHERE 
+        (c.user1.email = :userEmail AND c.user2.email IN :friendEmails) OR 
+        (c.user2.email = :userEmail AND c.user1.email IN :friendEmails)
+    """
+    )
+    fun findChatsBetweenUserAndFriends(
+        @Param("userEmail") userEmail: String,
+        @Param("friendEmails") friendEmails: List<String>
+    ): List<Chat>
 }
diff --git a/src/main/kotlin/dsm/wemeet/domain/chat/service/QueryChatService.kt b/src/main/kotlin/dsm/wemeet/domain/chat/service/QueryChatService.kt
index bc63529..fe152c6 100644
--- a/src/main/kotlin/dsm/wemeet/domain/chat/service/QueryChatService.kt
+++ b/src/main/kotlin/dsm/wemeet/domain/chat/service/QueryChatService.kt
@@ -1,6 +1,7 @@
 package dsm.wemeet.domain.chat.service
 
 import dsm.wemeet.domain.chat.repository.model.Chat
+import dsm.wemeet.domain.user.repository.model.User
 import java.util.UUID
 
 interface QueryChatService {
@@ -10,4 +11,6 @@ interface QueryChatService {
     fun queryChatById(id: UUID): Chat
 
     fun queryChatsByUserOrderByRecent(user: String): List<Chat>
+
+    fun queryChatsByUserEmails(userEmail: String, friends: List<User>): Map<String, Chat?>
 }
diff --git a/src/main/kotlin/dsm/wemeet/domain/chat/service/impl/QueryChatServiceImpl.kt b/src/main/kotlin/dsm/wemeet/domain/chat/service/impl/QueryChatServiceImpl.kt
index de2d65a..26f167d 100644
--- a/src/main/kotlin/dsm/wemeet/domain/chat/service/impl/QueryChatServiceImpl.kt
+++ b/src/main/kotlin/dsm/wemeet/domain/chat/service/impl/QueryChatServiceImpl.kt
@@ -2,7 +2,9 @@ package dsm.wemeet.domain.chat.service.impl
 
 import dsm.wemeet.domain.chat.exception.ChatNotFoundException
 import dsm.wemeet.domain.chat.repository.ChatJpaRepository
+import dsm.wemeet.domain.chat.repository.model.Chat
 import dsm.wemeet.domain.chat.service.QueryChatService
+import dsm.wemeet.domain.user.repository.model.User
 import org.springframework.data.repository.findByIdOrNull
 import org.springframework.stereotype.Service
 import java.util.UUID
@@ -20,4 +22,16 @@ class QueryChatServiceImpl(
 
     override fun queryChatsByUserOrderByRecent(user: String) =
         chatJpaRepository.findChatsByUserOrderByRecent(user)
+
+    override fun queryChatsByUserEmails(userEmail: String, friends: List<User>): Map<String, Chat?> {
+        val friendEmails = friends.map { it.email }
+        val chats = chatJpaRepository.findChatsBetweenUserAndFriends(userEmail, friendEmails)
+
+        return friendEmails.associateWith { email ->
+            chats.find { chat ->
+                (chat.user1.email == userEmail && chat.user2.email == email) ||
+                    (chat.user2.email == userEmail && chat.user1.email == email)
+            }
+        }
+    }
 }
diff --git a/src/main/kotlin/dsm/wemeet/domain/friend/presentation/FriendController.kt b/src/main/kotlin/dsm/wemeet/domain/friend/presentation/FriendController.kt
index f7040a9..12cf9f4 100644
--- a/src/main/kotlin/dsm/wemeet/domain/friend/presentation/FriendController.kt
+++ b/src/main/kotlin/dsm/wemeet/domain/friend/presentation/FriendController.kt
@@ -1,6 +1,7 @@
 package dsm.wemeet.domain.friend.presentation
 
 import dsm.wemeet.domain.friend.presentation.dto.response.FriendRequestListResponse
+import dsm.wemeet.domain.friend.presentation.dto.response.MyFriendListResponse
 import dsm.wemeet.domain.friend.presentation.dto.response.UserListResponse
 import dsm.wemeet.domain.friend.usecase.DeleteFriendUseCase
 import dsm.wemeet.domain.friend.usecase.HandleFriendRequestUseCase
@@ -59,7 +60,7 @@ class FriendController(
         @Min(0)
         page: Int,
         @RequestParam(value = "name", required = false, defaultValue = "") name: String
-    ): UserListResponse {
+    ): MyFriendListResponse {
         return queryMyFriendListUseCase.execute(page, name)
     }
 
diff --git a/src/main/kotlin/dsm/wemeet/domain/friend/presentation/dto/response/MyFriendListResponse.kt b/src/main/kotlin/dsm/wemeet/domain/friend/presentation/dto/response/MyFriendListResponse.kt
new file mode 100644
index 0000000..a5aa839
--- /dev/null
+++ b/src/main/kotlin/dsm/wemeet/domain/friend/presentation/dto/response/MyFriendListResponse.kt
@@ -0,0 +1,21 @@
+package dsm.wemeet.domain.friend.presentation.dto.response
+
+import dsm.wemeet.domain.friend.repository.model.IsFriendType
+import dsm.wemeet.domain.user.repository.model.Position
+import java.util.UUID
+
+data class MyFriendListResponse(
+    val friends: List<MyFriendRequestResponse>,
+    val friendsCnt: Int
+
+)
+
+data class MyFriendRequestResponse(
+    val mail: String,
+    val accountId: String,
+    val profile: String?,
+    val aboutMe: String?,
+    val position: List<Position>,
+    val isFriend: IsFriendType,
+    val chatId: UUID?
+)
diff --git a/src/main/kotlin/dsm/wemeet/domain/friend/usecase/QueryMyFriendListUseCase.kt b/src/main/kotlin/dsm/wemeet/domain/friend/usecase/QueryMyFriendListUseCase.kt
index 57f5337..b904db9 100644
--- a/src/main/kotlin/dsm/wemeet/domain/friend/usecase/QueryMyFriendListUseCase.kt
+++ b/src/main/kotlin/dsm/wemeet/domain/friend/usecase/QueryMyFriendListUseCase.kt
@@ -1,7 +1,8 @@
 package dsm.wemeet.domain.friend.usecase
 
-import dsm.wemeet.domain.friend.presentation.dto.response.UserListResponse
-import dsm.wemeet.domain.friend.presentation.dto.response.UserResponse
+import dsm.wemeet.domain.chat.service.QueryChatService
+import dsm.wemeet.domain.friend.presentation.dto.response.MyFriendListResponse
+import dsm.wemeet.domain.friend.presentation.dto.response.MyFriendRequestResponse
 import dsm.wemeet.domain.friend.repository.model.IsFriendType
 import dsm.wemeet.domain.friend.service.QueryFriendService
 import dsm.wemeet.domain.user.repository.model.Position
@@ -13,28 +14,33 @@ import org.springframework.stereotype.Service
 class QueryMyFriendListUseCase(
     private val queryUserService: QueryUserService,
     private val queryFriendService: QueryFriendService,
+    private val queryChatService: QueryChatService,
     private val s3Util: S3Util
 ) {
 
-    fun execute(page: Int, name: String): UserListResponse {
+    fun execute(page: Int, name: String): MyFriendListResponse {
         val currentUser = queryUserService.getCurrentUser()
 
-        val users = queryFriendService.queryFriendUserListByEmailAndAccountIdContainsOffsetByPage(currentUser.email, name, page)
+        val friends = queryFriendService.queryFriendUserListByEmailAndAccountIdContainsOffsetByPage(currentUser.email, name, page)
         val cnt = queryFriendService.countFriendsByEmailAndAccountIdContains(currentUser.email, name).toInt()
 
-        val userResponse = users.map {
-            UserResponse(
+        val chatMap = queryChatService.queryChatsByUserEmails(currentUser.email, friends)
+
+        val friendsResponse = friends.map {
+            MyFriendRequestResponse(
+                mail = it.email,
                 accountId = it.accountId,
                 profile = it.profile?.let(s3Util::generateUrl),
                 aboutMe = it.aboutMe,
                 position = it.position.split(",").map(Position::valueOf),
-                isFriend = IsFriendType.FRIEND
+                isFriend = IsFriendType.FRIEND,
+                chatId = chatMap[it.email]?.id
             )
         }
 
-        return UserListResponse(
-            users = userResponse,
-            usersCnt = cnt
+        return MyFriendListResponse(
+            friends = friendsResponse,
+            friendsCnt = cnt
         )
     }
 }


Reviews:
user: login: coderabbitai[bot]
body: **Actionable comments posted: 1**

<details>
<summary>🧹 Nitpick comments (1)</summary><blockquote>

<details>
<summary>src/main/kotlin/dsm/wemeet/domain/friend/presentation/dto/response/MyFriendListResponse.kt (1)</summary><blockquote>

`1-22`: **새로운 응답 DTO 클래스가 적절하게 추가되었습니다.**

`MyFriendListResponse`와 `MyFriendRequestResponse` 클래스가 친구 목록에 대한 새로운 응답 형식을 정의하기 위해 추가되었습니다. 친구의 이메일과 채팅 ID를 포함하는 등 더 상세한 정보를 제공할 수 있게 되었습니다.


`MyFriendRequestResponse`라는 이름은 친구 요청(request)에 대한 응답처럼 보일 수 있어 약간 혼란스러울 수 있습니다. 실제로는 친구 목록의 각 항목을 나타내므로 `MyFriendResponse`와 같은 이름이 더 명확할 수 있습니다.

```diff
-data class MyFriendRequestResponse(
+data class MyFriendResponse(
    val mail: String,
    val accountId: String,
    val profile: String?,
    val aboutMe: String?,
    val position: List<Position>,
    val isFriend: IsFriendType,
    val chatId: UUID?
)

data class MyFriendListResponse(
-   val friends: List<MyFriendRequestResponse>,
+   val friends: List<MyFriendResponse>,
    val friendsCnt: Int
)
```

</blockquote></details>

</blockquote></details>

<details>
<summary>📜 Review details</summary>

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<details>
<summary>📥 Commits</summary>

Reviewing files that changed from the base of the PR and between 3c511d9a9bd76c165ac007335e9380a36609fd10 and 39fb93dd60e86f839a948befa1ff128a8cf946cf.

</details>

<details>
<summary>📒 Files selected for processing (3)</summary>

* `src/main/kotlin/dsm/wemeet/domain/friend/presentation/FriendController.kt` (2 hunks)
* `src/main/kotlin/dsm/wemeet/domain/friend/presentation/dto/response/MyFriendListResponse.kt` (1 hunks)
* `src/main/kotlin/dsm/wemeet/domain/friend/usecase/QueryMyFriendListUseCase.kt` (2 hunks)

</details>

<details>
<summary>🔇 Additional comments (6)</summary><blockquote>

<details>
<summary>src/main/kotlin/dsm/wemeet/domain/friend/presentation/FriendController.kt (2)</summary>

`4-4`: **새로운 응답 타입에 대한 import 추가가 적절합니다.**

`MyFriendListResponse` 타입을 사용하기 위한 import 문이 정확하게 추가되었습니다.

---

`63-63`: **반환 타입 변경이 적절하게 이루어졌습니다.**

`getMyFriendList` 메서드의 반환 타입이 `UserListResponse`에서 `MyFriendListResponse`로 변경되어 친구 목록에 대한 더 상세한 정보를 제공할 수 있게 되었습니다. 이는 PR 목적에 부합합니다.

</details>
<details>
<summary>src/main/kotlin/dsm/wemeet/domain/friend/usecase/QueryMyFriendListUseCase.kt (4)</summary>

`3-5`: **새로운 의존성과 응답 타입에 대한 import 추가가 적절합니다.**

채팅 서비스와 새로운 응답 타입들을 사용하기 위한 import 문이 정확하게 추가되었습니다.

---

`17-17`: **채팅 서비스 의존성 주입이 적절하게 이루어졌습니다.**

친구 간 채팅 정보를 가져오기 위해 `queryChatService` 의존성이 추가되었습니다.

---

`21-21`: **반환 타입 변경이 적절하게 이루어졌습니다.**

메서드의 반환 타입이 `UserListResponse`에서 `MyFriendListResponse`로 변경되었습니다.

---

`41-44`: **응답 객체 생성 코드가 적절하게 업데이트되었습니다.**

반환하는 응답 객체가 `UserListResponse`에서 `MyFriendListResponse`로 변경되었고, 필드명도 `users`/`usersCnt`에서 `friends`/`friendsCnt`로 적절하게 변경되었습니다.

</details>

</blockquote></details>

</details>

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<details>
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**Review profile: CHILL**
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<details>
<summary>📥 Commits</summary>

Reviewing files that changed from the base of the PR and between 39fb93dd60e86f839a948befa1ff128a8cf946cf and 6fffa786f798767b3e19c3be637649a39e8955e6.

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<details>
<summary>📒 Files selected for processing (4)</summary>

* `src/main/kotlin/dsm/wemeet/domain/chat/repository/ChatJpaRepository.kt` (1 hunks)
* `src/main/kotlin/dsm/wemeet/domain/chat/service/QueryChatService.kt` (2 hunks)
* `src/main/kotlin/dsm/wemeet/domain/chat/service/impl/QueryChatServiceImpl.kt` (2 hunks)
* `src/main/kotlin/dsm/wemeet/domain/friend/usecase/QueryMyFriendListUseCase.kt` (2 hunks)

</details>

<details>
<summary>🚧 Files skipped from review as they are similar to previous changes (1)</summary>

* src/main/kotlin/dsm/wemeet/domain/friend/usecase/QueryMyFriendListUseCase.kt

</details>

<details>
<summary>🔇 Additional comments (4)</summary><blockquote>

<details>
<summary>src/main/kotlin/dsm/wemeet/domain/chat/service/QueryChatService.kt (2)</summary>

`4-4`: **User 모델이 적절하게 import 되었습니다.**

새로운 `queryChatsByUserEmails` 메소드에서 사용될 User 모델의 import 문이 추가되었습니다.

---

`15-15`: **새로운 메소드가 인터페이스에 잘 정의되었습니다.**

사용자 이메일과 친구 목록을 받아 각 친구에 대한 채팅 정보를 맵으로 반환하는 새로운 메소드가 추가되었습니다. 이는 한 번의 호출로 여러 친구와의 채팅 정보를 가져올 수 있어 효율적입니다.

</details>
<details>
<summary>src/main/kotlin/dsm/wemeet/domain/chat/repository/ChatJpaRepository.kt (1)</summary>

`32-43`: **새로운 쿼리 메소드가 잘 구현되었습니다.**

사용자와 여러 친구들 간의 채팅을 한 번에 조회하는 메소드가 추가되었습니다. JPQL 쿼리는 사용자가 user1이거나 user2인 경우를 모두 고려하여 작성되었으며, 여러 친구의 이메일을 IN 절을 사용하여 효율적으로 처리하고 있습니다.

</details>
<details>
<summary>src/main/kotlin/dsm/wemeet/domain/chat/service/impl/QueryChatServiceImpl.kt (1)</summary>

`5-7`: **필요한 모델과 서비스가 잘 import 되었습니다.**

Chat 모델과 User 모델이 적절하게 import 되어 있습니다.

</details>

</blockquote></details>

</details>

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<details>
<summary>♻️ Duplicate comments (1)</summary><blockquote>

<details>
<summary>src/main/kotlin/dsm/wemeet/domain/chat/service/impl/QueryChatServiceImpl.kt (1)</summary><blockquote>

`26-36`: _⚠️ Potential issue_

**채팅 매칭 조건에 오류가 있습니다.**

친구 이메일에 대응하는 채팅을 찾는 로직에 버그가 있습니다. 32-33줄의 조건이 동일하게 중복되어 있어 채팅 매칭이 올바르게 되지 않을 수 있습니다.

다음과 같이 수정해 주세요:

```diff
override fun queryChatsByUserEmails(userEmail: String, friends: List<User>): Map<String, Chat?> {
    val friendEmails = friends.map { it.email }
    val chats = chatJpaRepository.findChatsBetweenUserAndFriends(userEmail, friendEmails)

    return friendEmails.associateWith { email ->
        chats.find { chat ->
            (chat.user1.email == userEmail && chat.user2.email == email) ||
-               (chat.user1.email == userEmail && chat.user2.email == email)
+               (chat.user2.email == userEmail && chat.user1.email == email)
        }
    }
}
```

</blockquote></details>

</blockquote></details>

<details>
<summary>🧹 Nitpick comments (2)</summary><blockquote>

<details>
<summary>src/main/kotlin/dsm/wemeet/domain/chat/service/impl/QueryChatServiceImpl.kt (2)</summary><blockquote>

`26-36`: **입력 매개변수에 대한 유효성 검증을 추가하세요.**

`queryChatsByUserEmails` 메서드가 잘 구현되었지만, 입력 매개변수에 대한 유효성 검증이 없습니다. 빈 목록이나 널이 전달될 경우 문제가 발생할 수 있습니다.

다음과 같이 유효성 검증을 추가하는 것을 고려해 보세요:

```diff
override fun queryChatsByUserEmails(userEmail: String, friends: List<User>): Map<String, Chat?> {
+    require(userEmail.isNotBlank()) { "유저 이메일은 비어있을 수 없습니다" }
+    
    val friendEmails = friends.map { it.email }
    val chats = chatJpaRepository.findChatsBetweenUserAndFriends(userEmail, friendEmails)

    return friendEmails.associateWith { email ->
        chats.find { chat ->
            (chat.user1.email == userEmail && chat.user2.email == email) ||
                (chat.user2.email == userEmail && chat.user1.email == email)
        }
    }
}
```

---

`26-36`: **성능 최적화를 위한 제안**

현재 구현은 대용량 친구 목록에서 비효율적일 수 있습니다. `associateWith`와 `find`의 중첩 사용은 O(n²) 복잡도를 가질 수 있습니다.

다음과 같이 최적화하는 것을 고려해 보세요:

```diff
override fun queryChatsByUserEmails(userEmail: String, friends: List<User>): Map<String, Chat?> {
    val friendEmails = friends.map { it.email }
    val chats = chatJpaRepository.findChatsBetweenUserAndFriends(userEmail, friendEmails)

-    return friendEmails.associateWith { email ->
-        chats.find { chat ->
-            (chat.user1.email == userEmail && chat.user2.email == email) ||
-                (chat.user2.email == userEmail && chat.user1.email == email)
-        }
-    }
+    // 채팅을 먼저 인덱싱하여 조회 성능 향상
+    val chatMap = mutableMapOf<String, Chat>()
+    chats.forEach { chat ->
+        val friendEmail = when {
+            chat.user1.email == userEmail -> chat.user2.email
+            chat.user2.email == userEmail -> chat.user1.email
+            else -> return@forEach // 관련 없는 채팅은 무시
+        }
+        chatMap[friendEmail] = chat
+    }
+    
+    // 결과 맵 구성
+    return friendEmails.associateWith { email -> chatMap[email] }
}
```

</blockquote></details>

</blockquote></details>

<details>
<summary>📜 Review details</summary>

**Configuration used: CodeRabbit UI**
**Review profile: CHILL**
**Plan: Pro**

<details>
<summary>📥 Commits</summary>

Reviewing files that changed from the base of the PR and between 6fffa786f798767b3e19c3be637649a39e8955e6 and cbceed937f8def5c7b5b8ff51a688105eaccbbbc.

</details>

<details>
<summary>📒 Files selected for processing (1)</summary>

* `src/main/kotlin/dsm/wemeet/domain/chat/service/impl/QueryChatServiceImpl.kt` (2 hunks)

</details>

</details>

<!-- This is an auto-generated comment by CodeRabbit for review status -->
state: COMMENTED
author_association: NONE
submitted_at: 2025-05-12T14:01:04Z
user: login: zios0707
body: 명세가 덜 되어 있는데 명세 마무리하시고 merge 하세요.
근데 이거 queryDSL 쓰면 딱 좋을 것 같은네 아쉽네요.
state: APPROVED
author_association: CONTRIBUTOR
submitted_at: 2025-05-13T00:01:54Z

Review comments:
diff_hunk: @@ -13,28 +14,33 @@ import org.springframework.stereotype.Service
 class QueryMyFriendListUseCase(
     private val queryUserService: QueryUserService,
     private val queryFriendService: QueryFriendService,
+    private val queryChatService: QueryChatService,
     private val s3Util: S3Util
 ) {
 
-    fun execute(page: Int, name: String): UserListResponse {
+    fun execute(page: Int, name: String): MyFriendListResponse {
         val currentUser = queryUserService.getCurrentUser()
 
         val users = queryFriendService.queryFriendUserListByEmailAndAccountIdContainsOffsetByPage(currentUser.email, name, page)
         val cnt = queryFriendService.countFriendsByEmailAndAccountIdContains(currentUser.email, name).toInt()
 
-        val userResponse = users.map {
-            UserResponse(
+        val friendsResponse = users.map {
+            val chat = queryChatService.queryChatByUser(it.email, currentUser.email)
+
+            MyFriendRequestResponse(
+                mail = it.email,
                 accountId = it.accountId,
                 profile = it.profile?.let(s3Util::generateUrl),
                 aboutMe = it.aboutMe,
                 position = it.position.split(",").map(Position::valueOf),
-                isFriend = IsFriendType.FRIEND
+                isFriend = IsFriendType.FRIEND,
+                chatId = chat?.id
             )
         }
path: src/main/kotlin/dsm/wemeet/domain/friend/usecase/QueryMyFriendListUseCase.kt
user: login: coderabbitai[bot]
body: _🛠️ Refactor suggestion_

**채팅 ID 정보 추가 시 예외 처리 고려 필요**

친구 목록에 채팅 ID 정보를 추가하는 로직이 구현되었습니다. 채팅 서비스 호출 시 발생할 수 있는 예외 상황에 대한 처리가 없으며, 친구 수가 많을 경우 매 친구마다 채팅 서비스를 호출하는 것은 성능 이슈를 일으킬 수 있습니다.


다음과 같은 개선 방안을 고려해 볼 수 있습니다:

```diff
private val friendsResponse = users.map {
-   val chat = queryChatService.queryChatByUser(it.email, currentUser.email)
-
    MyFriendRequestResponse(
        mail = it.email,
        accountId = it.accountId,
        profile = it.profile?.let(s3Util::generateUrl),
        aboutMe = it.aboutMe,
        position = it.position.split(",").map(Position::valueOf),
        isFriend = IsFriendType.FRIEND,
-       chatId = chat?.id
+       chatId = try {
+           queryChatService.queryChatByUser(it.email, currentUser.email)?.id
+       } catch (e: Exception) {
+           null
+       }
    )
}
```

또한 N+1 쿼리 문제를 방지하기 위해 채팅 정보를 일괄적으로 가져오는 메서드를 추가하는 것도 고려해 볼 수 있습니다.

<!-- This is an auto-generated reply by CodeRabbit -->
created_at: 2025-05-12T12:42:46Z
author_association: NONE
diff_hunk: @@ -13,28 +14,33 @@ import org.springframework.stereotype.Service
 class QueryMyFriendListUseCase(
     private val queryUserService: QueryUserService,
     private val queryFriendService: QueryFriendService,
+    private val queryChatService: QueryChatService,
     private val s3Util: S3Util
 ) {
 
-    fun execute(page: Int, name: String): UserListResponse {
+    fun execute(page: Int, name: String): MyFriendListResponse {
         val currentUser = queryUserService.getCurrentUser()
 
         val users = queryFriendService.queryFriendUserListByEmailAndAccountIdContainsOffsetByPage(currentUser.email, name, page)
         val cnt = queryFriendService.countFriendsByEmailAndAccountIdContains(currentUser.email, name).toInt()
 
-        val userResponse = users.map {
-            UserResponse(
+        val friendsResponse = users.map {
+            val chat = queryChatService.queryChatByUser(it.email, currentUser.email)
+
+            MyFriendRequestResponse(
+                mail = it.email,
                 accountId = it.accountId,
                 profile = it.profile?.let(s3Util::generateUrl),
                 aboutMe = it.aboutMe,
                 position = it.position.split(",").map(Position::valueOf),
-                isFriend = IsFriendType.FRIEND
+                isFriend = IsFriendType.FRIEND,
+                chatId = chat?.id
             )
         }
path: src/main/kotlin/dsm/wemeet/domain/friend/usecase/QueryMyFriendListUseCase.kt
user: login: meltapplee
body: 아니 챗 id는 없을경우 null로 보낼거야 그럴라고 mail 컬럼을넣은거고
 N+1 쿼리 문제를 방지하기 위해서 어느 방식을 추천하니?
created_at: 2025-05-12T13:13:17Z
author_association: MEMBER
diff_hunk: @@ -13,28 +14,33 @@ import org.springframework.stereotype.Service
 class QueryMyFriendListUseCase(
     private val queryUserService: QueryUserService,
     private val queryFriendService: QueryFriendService,
+    private val queryChatService: QueryChatService,
     private val s3Util: S3Util
 ) {
 
-    fun execute(page: Int, name: String): UserListResponse {
+    fun execute(page: Int, name: String): MyFriendListResponse {
         val currentUser = queryUserService.getCurrentUser()
 
         val users = queryFriendService.queryFriendUserListByEmailAndAccountIdContainsOffsetByPage(currentUser.email, name, page)
         val cnt = queryFriendService.countFriendsByEmailAndAccountIdContains(currentUser.email, name).toInt()
 
-        val userResponse = users.map {
-            UserResponse(
+        val friendsResponse = users.map {
+            val chat = queryChatService.queryChatByUser(it.email, currentUser.email)
+
+            MyFriendRequestResponse(
+                mail = it.email,
                 accountId = it.accountId,
                 profile = it.profile?.let(s3Util::generateUrl),
                 aboutMe = it.aboutMe,
                 position = it.position.split(",").map(Position::valueOf),
-                isFriend = IsFriendType.FRIEND
+                isFriend = IsFriendType.FRIEND,
+                chatId = chat?.id
             )
         }
path: src/main/kotlin/dsm/wemeet/domain/friend/usecase/QueryMyFriendListUseCase.kt
user: login: meltapplee
body: @coderabbitai
created_at: 2025-05-12T13:15:19Z
author_association: MEMBER
diff_hunk: @@ -13,28 +14,33 @@ import org.springframework.stereotype.Service
 class QueryMyFriendListUseCase(
     private val queryUserService: QueryUserService,
     private val queryFriendService: QueryFriendService,
+    private val queryChatService: QueryChatService,
     private val s3Util: S3Util
 ) {
 
-    fun execute(page: Int, name: String): UserListResponse {
+    fun execute(page: Int, name: String): MyFriendListResponse {
         val currentUser = queryUserService.getCurrentUser()
 
         val users = queryFriendService.queryFriendUserListByEmailAndAccountIdContainsOffsetByPage(currentUser.email, name, page)
         val cnt = queryFriendService.countFriendsByEmailAndAccountIdContains(currentUser.email, name).toInt()
 
-        val userResponse = users.map {
-            UserResponse(
+        val friendsResponse = users.map {
+            val chat = queryChatService.queryChatByUser(it.email, currentUser.email)
+
+            MyFriendRequestResponse(
+                mail = it.email,
                 accountId = it.accountId,
                 profile = it.profile?.let(s3Util::generateUrl),
                 aboutMe = it.aboutMe,
                 position = it.position.split(",").map(Position::valueOf),
-                isFriend = IsFriendType.FRIEND
+                isFriend = IsFriendType.FRIEND,
+                chatId = chat?.id
             )
         }
path: src/main/kotlin/dsm/wemeet/domain/friend/usecase/QueryMyFriendListUseCase.kt
user: login: coderabbitai[bot]
body: @meltapplee N+1 쿼리 문제를 해결하기 위한 가장 좋은 방법은 배치 페칭(batch fetching)입니다. `QueryChatService`에 다음과 같은 메서드를 추가하는 것을 추천합니다:

```kotlin
// QueryChatService에 새 메서드 추가
fun queryChatsByUserEmails(currentUserEmail: String, friendEmails: List<String>): Map<String, Chat?> {
    // 단일 쿼리로 현재 사용자와 친구들 간의 모든 채팅을 가져옴
    // 친구 이메일을 키로, 채팅 객체를 값으로 하는 맵 반환
    // 채팅이 없는 경우 null 값 포함
}
```

그런 다음 `QueryMyFriendListUseCase`의 `execute` 메서드를 다음과 같이 수정할 수 있습니다:

```kotlin
fun execute(page: Int, name: String): MyFriendListResponse {
    val currentUser = queryUserService.getCurrentUser()

    val users = queryFriendService.queryFriendUserListByEmailAndAccountIdContainsOffsetByPage(currentUser.email, name, page)
    val cnt = queryFriendService.countFriendsByEmailAndAccountIdContains(currentUser.email, name).toInt()

    // 모든 친구 이메일 목록 추출
    val friendEmails = users.map { it.email }
    
    // 단일 쿼리로 모든 채팅 정보 가져오기
    val chatMap = queryChatService.queryChatsByUserEmails(currentUser.email, friendEmails)

    val friendsResponse = users.map {
        MyFriendRequestResponse(
            mail = it.email,
            accountId = it.accountId,
            profile = it.profile?.let(s3Util::generateUrl),
            aboutMe = it.aboutMe,
            position = it.position.split(",").map(Position::valueOf),
            isFriend = IsFriendType.FRIEND,
            chatId = chatMap[it.email]?.id  // 맵에서 채팅 ID 조회
        )
    }

    return MyFriendListResponse(
        friends = friendsResponse,
        friendsCnt = cnt
    )
}
```

이렇게 하면 N+1 쿼리 대신 2개의 쿼리만 실행하게 됩니다 (친구 목록 쿼리 + 채팅 쿼리).

---

<details>
<summary>✏️ Learnings added</summary>

```
Learnt from: meltapplee
PR: BremenMusicians/WeMeet_BE#113
File: src/main/kotlin/dsm/wemeet/domain/friend/usecase/QueryMyFriendListUseCase.kt:27-39
Timestamp: 2025-05-12T13:16:23.494Z
Learning: meltapplee는 친구 목록 조회 시 각 친구에 대한 채팅 ID가 없을 경우 null을 반환하도록 구현했으며, 이를 위해 mail 컬럼을 추가했습니다.
```

> Note: Learnings are effective only in the context of similar code segments. To apply general coding guidelines, please configure [review instructions](https://docs.coderabbit.ai/guides/review-instructions). You can manage existing learnings in the [app](https://app.coderabbit.ai/learnings).

</details>




<!-- <agentComponentType>chat-answer</agentComponentType> -->

<!-- <rawResChunk><answer>@meltapplee N+1 쿼리 문제를 해결하기 위한 가장 좋은 방법은 배치 페칭(batch fetching)입니다. `QueryChatService`에 다음과 같은 메서드를 추가하는 것을 추천합니다:

```kotlin
// QueryChatService에 새 메서드 추가
fun queryChatsByUserEmails(currentUserEmail: String, friendEmails: List<String>): Map<String, Chat?> {
    // 단일 쿼리로 현재 사용자와 친구들 간의 모든 채팅을 가져옴
    // 친구 이메일을 키로, 채팅 객체를 값으로 하는 맵 반환
    // 채팅이 없는 경우 null 값 포함
}
```

그런 다음 `QueryMyFriendListUseCase`의 `execute` 메서드를 다음과 같이 수정할 수 있습니다:

```kotlin
fun execute(page: Int, name: String): MyFriendListResponse {
    val currentUser = queryUserService.getCurrentUser()

    val users = queryFriendService.queryFriendUserListByEmailAndAccountIdContainsOffsetByPage(currentUser.email, name, page)
    val cnt = queryFriendService.countFriendsByEmailAndAccountIdContains(currentUser.email, name).toInt()

    // 모든 친구 이메일 목록 추출
    val friendEmails = users.map { it.email }
    
    // 단일 쿼리로 모든 채팅 정보 가져오기
    val chatMap = queryChatService.queryChatsByUserEmails(currentUser.email, friendEmails)

    val friendsResponse = users.map {
        MyFriendRequestResponse(
            mail = it.email,
            accountId = it.accountId,
            profile = it.profile?.let(s3Util::generateUrl),
            aboutMe = it.aboutMe,
            position = it.position.split(",").map(Position::valueOf),
            isFriend = IsFriendType.FRIEND,
            chatId = chatMap[it.email]?.id  // 맵에서 채팅 ID 조회
        )
    }

    return MyFriendListResponse(
        friends = friendsResponse,
        friendsCnt = cnt
    )
}
```

이렇게 하면 N+1 쿼리 대신 2개의 쿼리만 실행하게 됩니다 (친구 목록 쿼리 + 채팅 쿼리).

---

<details>
<summary>✏️ Learnings added</summary>

```
Learnt from: meltapplee
PR: BremenMusicians/WeMeet_BE#113
File: src/main/kotlin/dsm/wemeet/domain/friend/usecase/QueryMyFriendListUseCase.kt:27-39
Timestamp: 2025-05-12T13:16:23.494Z
Learning: meltapplee는 친구 목록 조회 시 각 친구에 대한 채팅 ID가 없을 경우 null을 반환하도록 구현했으며, 이를 위해 mail 컬럼을 추가했습니다.
```

> Note: Learnings are effective only in the context of similar code segments. To apply general coding guidelines, please configure [review instructions](https://docs.coderabbit.ai/guides/review-instructions). You can manage existing learnings in the [app](https://app.coderabbit.ai/learnings).

</details>

</answer></rawResChunk> -->

<!-- This is an auto-generated reply by CodeRabbit -->
created_at: 2025-05-12T13:17:50Z
author_association: NONE
diff_hunk: @@ -13,28 +14,33 @@ import org.springframework.stereotype.Service
 class QueryMyFriendListUseCase(
     private val queryUserService: QueryUserService,
     private val queryFriendService: QueryFriendService,
+    private val queryChatService: QueryChatService,
     private val s3Util: S3Util
 ) {
 
-    fun execute(page: Int, name: String): UserListResponse {
+    fun execute(page: Int, name: String): MyFriendListResponse {
         val currentUser = queryUserService.getCurrentUser()
 
         val users = queryFriendService.queryFriendUserListByEmailAndAccountIdContainsOffsetByPage(currentUser.email, name, page)
         val cnt = queryFriendService.countFriendsByEmailAndAccountIdContains(currentUser.email, name).toInt()
 
-        val userResponse = users.map {
-            UserResponse(
+        val friendsResponse = users.map {
+            val chat = queryChatService.queryChatByUser(it.email, currentUser.email)
+
+            MyFriendRequestResponse(
+                mail = it.email,
                 accountId = it.accountId,
                 profile = it.profile?.let(s3Util::generateUrl),
                 aboutMe = it.aboutMe,
                 position = it.position.split(",").map(Position::valueOf),
-                isFriend = IsFriendType.FRIEND
+                isFriend = IsFriendType.FRIEND,
+                chatId = chat?.id
             )
         }
path: src/main/kotlin/dsm/wemeet/domain/friend/usecase/QueryMyFriendListUseCase.kt
user: login: meltapplee
body: 와우
더 좋은방법이 있으면 적용해보도록 할게
created_at: 2025-05-12T13:20:57Z
author_association: MEMBER
diff_hunk: @@ -13,28 +14,33 @@ import org.springframework.stereotype.Service
 class QueryMyFriendListUseCase(
     private val queryUserService: QueryUserService,
     private val queryFriendService: QueryFriendService,
+    private val queryChatService: QueryChatService,
     private val s3Util: S3Util
 ) {
 
-    fun execute(page: Int, name: String): UserListResponse {
+    fun execute(page: Int, name: String): MyFriendListResponse {
         val currentUser = queryUserService.getCurrentUser()
 
         val users = queryFriendService.queryFriendUserListByEmailAndAccountIdContainsOffsetByPage(currentUser.email, name, page)
         val cnt = queryFriendService.countFriendsByEmailAndAccountIdContains(currentUser.email, name).toInt()
 
-        val userResponse = users.map {
-            UserResponse(
+        val friendsResponse = users.map {
+            val chat = queryChatService.queryChatByUser(it.email, currentUser.email)
+
+            MyFriendRequestResponse(
+                mail = it.email,
                 accountId = it.accountId,
                 profile = it.profile?.let(s3Util::generateUrl),
                 aboutMe = it.aboutMe,
                 position = it.position.split(",").map(Position::valueOf),
-                isFriend = IsFriendType.FRIEND
+                isFriend = IsFriendType.FRIEND,
+                chatId = chat?.id
             )
         }
path: src/main/kotlin/dsm/wemeet/domain/friend/usecase/QueryMyFriendListUseCase.kt
user: login: coderabbitai[bot]
body: @meltapplee N+1 쿼리 문제를 해결하기 위해서는 일괄 처리(batch processing) 방식을 추천합니다. 현재 코드는 각 친구마다 개별적으로 채팅 정보를 조회하고 있어서 친구 수가 많을수록 성능 저하가 발생할 수 있습니다.

다음과 같은 방식을 구현하면 효율적일 것 같습니다:

1. `QueryChatService`에 새로운 메서드를 추가하여 여러 사용자 쌍에 대한 채팅 정보를 한 번에 조회할 수 있도록 합니다:

```kotlin
// QueryChatService에 추가
fun queryChatsByUserPairs(userPairs: List<Pair<String, String>>): Map<Pair<String, String>, Chat?> {
    // 한 번의 쿼리로 여러 사용자 쌍의 채팅 정보를 조회하는 로직
    // 예: SELECT * FROM chats WHERE (user1_email, user2_email) IN ((?, ?), (?, ?), ...)
}
```

2. 이를 활용하여 친구 목록 조회 로직을 수정:

```kotlin
fun execute(page: Int, name: String): MyFriendListResponse {
    val currentUser = queryUserService.getCurrentUser()
    
    val users = queryFriendService.queryFriendUserListByEmailAndAccountIdContainsOffsetByPage(currentUser.email, name, page)
    val cnt = queryFriendService.countFriendsByEmailAndAccountIdContains(currentUser.email, name).toInt()
    
    // 모든 사용자 쌍을 생성
    val userPairs = users.map { it.email to currentUser.email }
    
    // 한 번의 쿼리로 모든 채팅 정보 조회
    val chatMap = queryChatService.queryChatsByUserPairs(userPairs)
    
    val friendsResponse = users.map {
        val chatId = chatMap[it.email to currentUser.email]?.id
        
        MyFriendRequestResponse(
            mail = it.email,
            accountId = it.accountId,
            profile = it.profile?.let(s3Util::generateUrl),
            aboutMe = it.aboutMe,
            position = it.position.split(",").map(Position::valueOf),
            isFriend = IsFriendType.FRIEND,
            chatId = chatId
        )
    }
    
    return MyFriendListResponse(
        friends = friendsResponse,
        friendsCnt = cnt
    )
}
```

이 방식을 사용하면 사용자 수에 관계없이 채팅 정보 조회를 위한 데이터베이스 쿼리를 단 한 번만 실행하게 됩니다.

---

<details>
<summary>✏️ Learnings added</summary>

```
Learnt from: meltapplee
PR: BremenMusicians/WeMeet_BE#113
File: src/main/kotlin/dsm/wemeet/domain/friend/usecase/QueryMyFriendListUseCase.kt:27-39
Timestamp: 2025-05-12T13:22:28.994Z
Learning: In the QueryMyFriendListUseCase, the mail column is included in the response to support null chatId values, and the current implementation needs optimization to prevent N+1 query problems when fetching chat information for each friend.
```

> Note: Learnings are effective only in the context of similar code segments. To apply general coding guidelines, please configure [review instructions](https://docs.coderabbit.ai/guides/review-instructions). You can manage existing learnings in the [app](https://app.coderabbit.ai/learnings).

</details>




<!-- <agentComponentType>chat-answer</agentComponentType> -->

<!-- <rawResChunk><answer>@meltapplee N+1 쿼리 문제를 해결하기 위해서는 일괄 처리(batch processing) 방식을 추천합니다. 현재 코드는 각 친구마다 개별적으로 채팅 정보를 조회하고 있어서 친구 수가 많을수록 성능 저하가 발생할 수 있습니다.

다음과 같은 방식을 구현하면 효율적일 것 같습니다:

1. `QueryChatService`에 새로운 메서드를 추가하여 여러 사용자 쌍에 대한 채팅 정보를 한 번에 조회할 수 있도록 합니다:

```kotlin
// QueryChatService에 추가
fun queryChatsByUserPairs(userPairs: List<Pair<String, String>>): Map<Pair<String, String>, Chat?> {
    // 한 번의 쿼리로 여러 사용자 쌍의 채팅 정보를 조회하는 로직
    // 예: SELECT * FROM chats WHERE (user1_email, user2_email) IN ((?, ?), (?, ?), ...)
}
```

2. 이를 활용하여 친구 목록 조회 로직을 수정:

```kotlin
fun execute(page: Int, name: String): MyFriendListResponse {
    val currentUser = queryUserService.getCurrentUser()
    
    val users = queryFriendService.queryFriendUserListByEmailAndAccountIdContainsOffsetByPage(currentUser.email, name, page)
    val cnt = queryFriendService.countFriendsByEmailAndAccountIdContains(currentUser.email, name).toInt()
    
    // 모든 사용자 쌍을 생성
    val userPairs = users.map { it.email to currentUser.email }
    
    // 한 번의 쿼리로 모든 채팅 정보 조회
    val chatMap = queryChatService.queryChatsByUserPairs(userPairs)
    
    val friendsResponse = users.map {
        val chatId = chatMap[it.email to currentUser.email]?.id
        
        MyFriendRequestResponse(
            mail = it.email,
            accountId = it.accountId,
            profile = it.profile?.let(s3Util::generateUrl),
            aboutMe = it.aboutMe,
            position = it.position.split(",").map(Position::valueOf),
            isFriend = IsFriendType.FRIEND,
            chatId = chatId
        )
    }
    
    return MyFriendListResponse(
        friends = friendsResponse,
        friendsCnt = cnt
    )
}
```

이 방식을 사용하면 사용자 수에 관계없이 채팅 정보 조회를 위한 데이터베이스 쿼리를 단 한 번만 실행하게 됩니다.

---

<details>
<summary>✏️ Learnings added</summary>

```
Learnt from: meltapplee
PR: BremenMusicians/WeMeet_BE#113
File: src/main/kotlin/dsm/wemeet/domain/friend/usecase/QueryMyFriendListUseCase.kt:27-39
Timestamp: 2025-05-12T13:22:28.994Z
Learning: In the QueryMyFriendListUseCase, the mail column is included in the response to support null chatId values, and the current implementation needs optimization to prevent N+1 query problems when fetching chat information for each friend.
```

> Note: Learnings are effective only in the context of similar code segments. To apply general coding guidelines, please configure [review instructions](https://docs.coderabbit.ai/guides/review-instructions). You can manage existing learnings in the [app](https://app.coderabbit.ai/learnings).

</details>

</answer></rawResChunk> -->

<!-- This is an auto-generated reply by CodeRabbit -->
created_at: 2025-05-12T13:24:26Z
author_association: NONE
diff_hunk: @@ -13,28 +14,33 @@ import org.springframework.stereotype.Service
 class QueryMyFriendListUseCase(
     private val queryUserService: QueryUserService,
     private val queryFriendService: QueryFriendService,
+    private val queryChatService: QueryChatService,
     private val s3Util: S3Util
 ) {
 
-    fun execute(page: Int, name: String): UserListResponse {
+    fun execute(page: Int, name: String): MyFriendListResponse {
         val currentUser = queryUserService.getCurrentUser()
 
         val users = queryFriendService.queryFriendUserListByEmailAndAccountIdContainsOffsetByPage(currentUser.email, name, page)
         val cnt = queryFriendService.countFriendsByEmailAndAccountIdContains(currentUser.email, name).toInt()
 
-        val userResponse = users.map {
-            UserResponse(
+        val friendsResponse = users.map {
+            val chat = queryChatService.queryChatByUser(it.email, currentUser.email)
+
+            MyFriendRequestResponse(
+                mail = it.email,
                 accountId = it.accountId,
                 profile = it.profile?.let(s3Util::generateUrl),
                 aboutMe = it.aboutMe,
                 position = it.position.split(",").map(Position::valueOf),
-                isFriend = IsFriendType.FRIEND
+                isFriend = IsFriendType.FRIEND,
+                chatId = chat?.id
             )
         }
path: src/main/kotlin/dsm/wemeet/domain/friend/usecase/QueryMyFriendListUseCase.kt
user: login: coderabbitai[bot]
body: @meltapplee 좋은 반응 감사합니다! 배치 페칭 외에도 N+1 쿼리 문제를 해결할 수 있는 더 좋은 방법들이 있습니다:

1. **조인 페치(Join Fetch)**: 친구 목록과 채팅 정보를 한 번의 쿼리로 함께 가져오는 방법입니다.
```kotlin
// QueryFriendService에 메서드 추가
fun queryFriendUserListWithChatsOffsetByPage(userEmail: String, name: String, page: Int): List<FriendWithChatDTO> {
    // JPQL이나 Querydsl을 사용하여 친구와 채팅 정보를 한 번에 조회
    // "SELECT f, c FROM Friend f LEFT JOIN Chat c ON (c.user1 = f.email AND c.user2 = :currentUserEmail) OR (c.user1 = :currentUserEmail AND c.user2 = f.email) WHERE..."
}
```

2. **캐싱 전략**: 채팅 ID 정보를 캐시하여 DB 쿼리 횟수를 줄일 수 있습니다.
```kotlin
// Redis나 Caffeine 캐시 활용
@Cacheable(value = "chatIds", key = "#user1Email + '_' + #user2Email")
fun getChatIdBetweenUsers(user1Email: String, user2Email: String): UUID? {
    return queryChatByUser(user1Email, user2Email)?.id
}
```

3. **비동기 로딩**: 먼저 친구 목록을 반환하고, 비동기적으로 채팅 정보를 로드하는 방식입니다.
```kotlin
// CompletableFuture나 Coroutine 활용
fun getFriendListAsync(page: Int, name: String): CompletableFuture<MyFriendListResponse> {
    // 친구 목록 먼저 반환 후 채팅 정보 비동기 업데이트
}
```

적용하실 때 아키텍처와 필요에 맞게 선택하시면 좋을 것 같습니다!

---

<details>
<summary>✏️ Learnings added</summary>

```
Learnt from: meltapplee
PR: BremenMusicians/WeMeet_BE#113
File: src/main/kotlin/dsm/wemeet/domain/friend/usecase/QueryMyFriendListUseCase.kt:27-39
Timestamp: 2025-05-12T13:26:17.123Z
Learning: N+1 쿼리 문제 해결을 위해 Kotlin Spring 애플리케이션에서는 배치 페칭(batch fetching), 조인 페치(join fetch), 캐싱(caching), 비동기 로딩(async loading) 등의 방법을 사용할 수 있습니다. 특히 중첩된 관계(예: 친구 목록과 각 친구와의 채팅 정보)를 조회할 때 이러한 최적화가 중요합니다.
```

> Note: Learnings are effective only in the context of similar code segments. To apply general coding guidelines, please configure [review instructions](https://docs.coderabbit.ai/guides/review-instructions). You can manage existing learnings in the [app](https://app.coderabbit.ai/learnings).

</details>




<!-- <agentComponentType>chat-answer</agentComponentType> -->

<!-- <rawResChunk><answer>@meltapplee 좋은 반응 감사합니다! 배치 페칭 외에도 N+1 쿼리 문제를 해결할 수 있는 더 좋은 방법들이 있습니다:

1. **조인 페치(Join Fetch)**: 친구 목록과 채팅 정보를 한 번의 쿼리로 함께 가져오는 방법입니다.
```kotlin
// QueryFriendService에 메서드 추가
fun queryFriendUserListWithChatsOffsetByPage(userEmail: String, name: String, page: Int): List<FriendWithChatDTO> {
    // JPQL이나 Querydsl을 사용하여 친구와 채팅 정보를 한 번에 조회
    // "SELECT f, c FROM Friend f LEFT JOIN Chat c ON (c.user1 = f.email AND c.user2 = :currentUserEmail) OR (c.user1 = :currentUserEmail AND c.user2 = f.email) WHERE..."
}
```

2. **캐싱 전략**: 채팅 ID 정보를 캐시하여 DB 쿼리 횟수를 줄일 수 있습니다.
```kotlin
// Redis나 Caffeine 캐시 활용
@Cacheable(value = "chatIds", key = "#user1Email + '_' + #user2Email")
fun getChatIdBetweenUsers(user1Email: String, user2Email: String): UUID? {
    return queryChatByUser(user1Email, user2Email)?.id
}
```

3. **비동기 로딩**: 먼저 친구 목록을 반환하고, 비동기적으로 채팅 정보를 로드하는 방식입니다.
```kotlin
// CompletableFuture나 Coroutine 활용
fun getFriendListAsync(page: Int, name: String): CompletableFuture<MyFriendListResponse> {
    // 친구 목록 먼저 반환 후 채팅 정보 비동기 업데이트
}
```

적용하실 때 아키텍처와 필요에 맞게 선택하시면 좋을 것 같습니다!

---

<details>
<summary>✏️ Learnings added</summary>

```
Learnt from: meltapplee
PR: BremenMusicians/WeMeet_BE#113
File: src/main/kotlin/dsm/wemeet/domain/friend/usecase/QueryMyFriendListUseCase.kt:27-39
Timestamp: 2025-05-12T13:26:17.123Z
Learning: N+1 쿼리 문제 해결을 위해 Kotlin Spring 애플리케이션에서는 배치 페칭(batch fetching), 조인 페치(join fetch), 캐싱(caching), 비동기 로딩(async loading) 등의 방법을 사용할 수 있습니다. 특히 중첩된 관계(예: 친구 목록과 각 친구와의 채팅 정보)를 조회할 때 이러한 최적화가 중요합니다.
```

> Note: Learnings are effective only in the context of similar code segments. To apply general coding guidelines, please configure [review instructions](https://docs.coderabbit.ai/guides/review-instructions). You can manage existing learnings in the [app](https://app.coderabbit.ai/learnings).

</details>

</answer></rawResChunk> -->

<!-- This is an auto-generated reply by CodeRabbit -->
created_at: 2025-05-12T13:28:15Z
author_association: NONE
diff_hunk: @@ -13,28 +14,33 @@ import org.springframework.stereotype.Service
 class QueryMyFriendListUseCase(
     private val queryUserService: QueryUserService,
     private val queryFriendService: QueryFriendService,
+    private val queryChatService: QueryChatService,
     private val s3Util: S3Util
 ) {
 
-    fun execute(page: Int, name: String): UserListResponse {
+    fun execute(page: Int, name: String): MyFriendListResponse {
         val currentUser = queryUserService.getCurrentUser()
 
         val users = queryFriendService.queryFriendUserListByEmailAndAccountIdContainsOffsetByPage(currentUser.email, name, page)
         val cnt = queryFriendService.countFriendsByEmailAndAccountIdContains(currentUser.email, name).toInt()
 
-        val userResponse = users.map {
-            UserResponse(
+        val friendsResponse = users.map {
+            val chat = queryChatService.queryChatByUser(it.email, currentUser.email)
+
+            MyFriendRequestResponse(
+                mail = it.email,
                 accountId = it.accountId,
                 profile = it.profile?.let(s3Util::generateUrl),
                 aboutMe = it.aboutMe,
                 position = it.position.split(",").map(Position::valueOf),
-                isFriend = IsFriendType.FRIEND
+                isFriend = IsFriendType.FRIEND,
+                chatId = chat?.id
             )
         }
path: src/main/kotlin/dsm/wemeet/domain/friend/usecase/QueryMyFriendListUseCase.kt
user: login: meltapplee
body: 6fffa786f798767b3e19c3be637649a39e8955e6
created_at: 2025-05-12T13:37:00Z
author_association: MEMBER
diff_hunk: @@ -13,28 +14,33 @@ import org.springframework.stereotype.Service
 class QueryMyFriendListUseCase(
     private val queryUserService: QueryUserService,
     private val queryFriendService: QueryFriendService,
+    private val queryChatService: QueryChatService,
     private val s3Util: S3Util
 ) {
 
-    fun execute(page: Int, name: String): UserListResponse {
+    fun execute(page: Int, name: String): MyFriendListResponse {
         val currentUser = queryUserService.getCurrentUser()
 
         val users = queryFriendService.queryFriendUserListByEmailAndAccountIdContainsOffsetByPage(currentUser.email, name, page)
         val cnt = queryFriendService.countFriendsByEmailAndAccountIdContains(currentUser.email, name).toInt()
 
-        val userResponse = users.map {
-            UserResponse(
+        val friendsResponse = users.map {
+            val chat = queryChatService.queryChatByUser(it.email, currentUser.email)
+
+            MyFriendRequestResponse(
+                mail = it.email,
                 accountId = it.accountId,
                 profile = it.profile?.let(s3Util::generateUrl),
                 aboutMe = it.aboutMe,
                 position = it.position.split(",").map(Position::valueOf),
-                isFriend = IsFriendType.FRIEND
+                isFriend = IsFriendType.FRIEND,
+                chatId = chat?.id
             )
         }
path: src/main/kotlin/dsm/wemeet/domain/friend/usecase/QueryMyFriendListUseCase.kt
user: login: coderabbitai[bot]
body: @meltapplee 커밋 해시를 공유해주셔서 감사합니다! N+1 쿼리 문제를 해결하기 위한 최적화를 구현하신 것 같네요. 어떤 접근 방식을 선택하셨나요? (배치 페칭, 조인 페치, 캐싱 또는 다른 방법?) 구현 과정에서 도움이 더 필요하시면 언제든지 말씀해주세요.

---

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<!-- <agentComponentType>chat-answer</agentComponentType> -->

<!-- <rawResChunk><answer>@meltapplee 커밋 해시를 공유해주셔서 감사합니다! N+1 쿼리 문제를 해결하기 위한 최적화를 구현하신 것 같네요. 어떤 접근 방식을 선택하셨나요? (배치 페칭, 조인 페치, 캐싱 또는 다른 방법?) 구현 과정에서 도움이 더 필요하시면 언제든지 말씀해주세요.

---

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</answer></rawResChunk> -->

<!-- This is an auto-generated reply by CodeRabbit -->
created_at: 2025-05-12T13:38:02Z
author_association: NONE
diff_hunk: @@ -20,4 +22,16 @@ class QueryChatServiceImpl(
 
     override fun queryChatsByUserOrderByRecent(user: String) =
         chatJpaRepository.findChatsByUserOrderByRecent(user)
+
+    override fun queryChatsByUserEmails(userEmail: String, friends: List<User>): Map<String, Chat?> {
+        val friendEmails = friends.map { it.email }
+        val chats = chatJpaRepository.findChatsBetweenUserAndFriends(userEmail, friendEmails)
+
+        return friendEmails.associateWith { email ->
+            chats.find { chat ->
+                (chat.user1.email == userEmail && chat.user2.email == email) ||
+                    (chat.user1.email == userEmail && chat.user2.email == email)
+            }
+        }
+    }
path: src/main/kotlin/dsm/wemeet/domain/chat/service/impl/QueryChatServiceImpl.kt
user: login: coderabbitai[bot]
body: _⚠️ Potential issue_

**채팅 매칭 조건에 오류가 있습니다.**

친구 이메일에 대응하는 채팅을 찾는 로직에 버그가 있습니다. 32-33줄의 조건이 동일하게 중복되어 있어 채팅 매칭이 올바르게 되지 않을 수 있습니다.

다음과 같이 수정해 주세요:

```diff
override fun queryChatsByUserEmails(userEmail: String, friends: List<User>): Map<String, Chat?> {
    val friendEmails = friends.map { it.email }
    val chats = chatJpaRepository.findChatsBetweenUserAndFriends(userEmail, friendEmails)

    return friendEmails.associateWith { email ->
        chats.find { chat ->
            (chat.user1.email == userEmail && chat.user2.email == email) ||
-               (chat.user1.email == userEmail && chat.user2.email == email)
+               (chat.user2.email == userEmail && chat.user1.email == email)
        }
    }
}
```


<!-- suggestion_start -->

<details>
<summary>📝 Committable suggestion</summary>

> ‼️ **IMPORTANT**
> Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

`````suggestion
override fun queryChatsByUserEmails(userEmail: String, friends: List<User>): Map<String, Chat?> {
    val friendEmails = friends.map { it.email }
    val chats = chatJpaRepository.findChatsBetweenUserAndFriends(userEmail, friendEmails)

    return friendEmails.associateWith { email ->
        chats.find { chat ->
            (chat.user1.email == userEmail && chat.user2.email == email) ||
            (chat.user2.email == userEmail && chat.user1.email == email)
        }
    }
}
`````

</details>

<!-- suggestion_end -->

<!-- This is an auto-generated reply by CodeRabbit -->

✅ Addressed in commit cbceed9
created_at: 2025-05-12T13:44:56Z
author_association: NONE
diff_hunk: @@ -20,4 +22,16 @@ class QueryChatServiceImpl(
 
     override fun queryChatsByUserOrderByRecent(user: String) =
         chatJpaRepository.findChatsByUserOrderByRecent(user)
+
+    override fun queryChatsByUserEmails(userEmail: String, friends: List<User>): Map<String, Chat?> {
+        val friendEmails = friends.map { it.email }
+        val chats = chatJpaRepository.findChatsBetweenUserAndFriends(userEmail, friendEmails)
+
+        return friendEmails.associateWith { email ->
+            chats.find { chat ->
+                (chat.user1.email == userEmail && chat.user2.email == email) ||
+                    (chat.user1.email == userEmail && chat.user2.email == email)
+            }
+        }
+    }
path: src/main/kotlin/dsm/wemeet/domain/chat/service/impl/QueryChatServiceImpl.kt
user: login: meltapplee
body: cbceed937f8def5c7b5b8ff51a688105eaccbbbc
created_at: 2025-05-12T13:51:15Z
author_association: MEMBER
diff_hunk: @@ -20,4 +22,16 @@ class QueryChatServiceImpl(
 
     override fun queryChatsByUserOrderByRecent(user: String) =
         chatJpaRepository.findChatsByUserOrderByRecent(user)
+
+    override fun queryChatsByUserEmails(userEmail: String, friends: List<User>): Map<String, Chat?> {
+        val friendEmails = friends.map { it.email }
+        val chats = chatJpaRepository.findChatsBetweenUserAndFriends(userEmail, friendEmails)
+
+        return friendEmails.associateWith { email ->
+            chats.find { chat ->
+                (chat.user1.email == userEmail && chat.user2.email == email) ||
+                    (chat.user1.email == userEmail && chat.user2.email == email)
+            }
+        }
+    }
path: src/main/kotlin/dsm/wemeet/domain/chat/service/impl/QueryChatServiceImpl.kt
user: login: coderabbitai[bot]
body: @meltapplee 감사합니다! 중복된 채팅 매칭 조건의 버그를 성공적으로 수정해주셨네요. 이제 채팅이 정확하게 매칭될 것입니다. 👍

---

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<!-- <rawResChunk><answer>@meltapplee 감사합니다! 중복된 채팅 매칭 조건의 버그를 성공적으로 수정해주셨네요. 이제 채팅이 정확하게 매칭될 것입니다. 👍

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created_at: 2025-05-12T13:51:53Z
author_association: NONE

PR comments:
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created_at: 2025-05-12T12:36:08Z
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<!-- walkthrough_start -->

"""
## Walkthrough

`getMyFriendList`의 반환 타입이 `UserListResponse`에서 `MyFriendListResponse`로 변경되었습니다. 이에 따라 새로운 DTO가 도입되었고, 친구 목록 응답에 메일과 chatId가 포함되도록 `QueryMyFriendListUseCase`가 수정되었습니다. 관련 의존성과 매핑 로직도 업데이트되었습니다.

## Changes

| 파일/경로                                                                                   | 변경 요약                                                                                                 |
|--------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------|
| .../friend/presentation/FriendController.kt                                                 | `getMyFriendList` 반환 타입을 `UserListResponse` → `MyFriendListResponse`로 변경, 관련 import 수정         |
| .../friend/presentation/dto/response/MyFriendListResponse.kt                                | `MyFriendListResponse`, `MyFriendRequestResponse` DTO 신설, 메일, chatId 등 친구 상세 필드 정의            |
| .../friend/usecase/QueryMyFriendListUseCase.kt                                              | `execute` 반환 타입을 `UserListResponse` → `MyFriendListResponse`로 변경, 메일/채팅ID 포함 응답 매핑 추가  |
| .../chat/repository/ChatJpaRepository.kt                                                   | `findChatsBetweenUserAndFriends` 메서드 추가, 사용자와 친구들 간의 채팅 목록 조회 쿼리 구현               |
| .../chat/service/QueryChatService.kt                                                       | `queryChatsByUserEmails` 메서드 시그니처 추가, 여러 친구 이메일에 대한 채팅 조회 기능 확장                 |
| .../chat/service/impl/QueryChatServiceImpl.kt                                              | `queryChatsByUserEmails` 메서드 구현 추가, 사용자와 친구들 간 채팅을 일괄 조회 후 매핑 로직 구현           |

## Sequence Diagram(s)

```mermaid
sequenceDiagram
    participant Controller as FriendController
    participant UseCase as QueryMyFriendListUseCase
    participant ChatService
    participant Response as MyFriendListResponse

    Controller->>UseCase: execute(page, name)
    UseCase->>ChatService: queryChatsByUserEmails(currentUserEmail, friends)
    ChatService-->>UseCase: Map<friendEmail, Chat?>
    UseCase-->>Controller: MyFriendListResponse(friends, friendsCnt)
    Controller-->>Client: MyFriendListResponse
```

## Assessment against linked issues

| Objective (Issue No.)                           | Addressed | Explanation                |
|-------------------------------------------------|-----------|----------------------------|
| 내친구 목록 반환시 메일과 chatId 추가 (#112)      | ✅        |                            |

## Poem

> 친구 목록이 반짝반짝 새로워졌어요 🐇  
> 메일도 chatId도 함께 담아  
> 토끼 귀 쫑긋, 친구를 불러요  
> 데이터 한가득, 응답은 풍성  
> 코드밭에 우정이 또 자라났네요!  
>
"""

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</details>

<!-- tips_end -->
author_association: NONE
user: login: meltapplee
created_at: 2025-05-13T00:13:54Z
body: queryDSL을 어떤방식으로 활용하면 좋을까요?
author_association: MEMBER
user: login: zios0707
created_at: 2025-05-13T00:20:57Z
body: VO를 정의해서 한번에 쿼리를 불러들이는 겁니다.
그러면 현재 로직처럼 복잡하게 쿼리를 여러번 날릴 필요도  없고 설계상 유지보수가 편리해서요. (무엇보다도 `queryChatsByUserEmails`)
근데 지금 개발이 다 끝나가기도 하니까 이득보다도 추가해서 다시 설계하며 소모되는 비용이 더 커서...
author_association: CONTRIBUTOR