fix: 게시글 좋아요 로직 수정

community-application/src/main/kotlin/gloddy/article/port/in/ArticleCommandUseCase.kt

@@ -6,5 +6,5 @@ import gloddy.article.port.`in`.dto.read.ArticleCreateResponse
 interface ArticleCommandUseCase {
     fun create(userId: Long, command: ArticleCreateRequest): ArticleCreateResponse
     fun delete(userId: Long, articleId: Long)
-    fun like(userId: Long, articleId: Long)
+    fun upsertLike(userId: Long, articleId: Long)
 }

community-application/src/main/kotlin/gloddy/article/port/out/ArticleCommandPersistencePort.kt

@@ -1,8 +1,10 @@
 package gloddy.article.port.out
 
 import gloddy.article.Article
+import gloddy.article.ArticleLike
 
 interface ArticleCommandPersistencePort {
     fun save(article: Article) : Article
     fun delete(id: Long)
+    fun upsertLike(articleLike: ArticleLike, article: Article)
 }

community-application/src/main/kotlin/gloddy/article/service/ArticleCommandService.kt

@@ -20,10 +20,10 @@ class ArticleCommandService(
     private val articleQueryPersistencePort: ArticleQueryPersistencePort,
     private val articleCommandPersistencePort: ArticleCommandPersistencePort,
     private val articleLikeCommandPersistencePort: ArticleLikeCommandPersistencePort,
-    private val articleLikeQueryPersistencePort: ArticleLikeQueryPersistencePort
+    private val articleLikeQueryPersistencePort: ArticleLikeQueryPersistencePort,
 ) : ArticleCommandUseCase {
 
-    override fun create(userId: Long, command: ArticleCreateRequest) : ArticleCreateResponse {
+    override fun create(userId: Long, command: ArticleCreateRequest): ArticleCreateResponse {
 
         val category = categoryQueryPersistencePort.findById(CategoryId(command.categoryId))
 
@@ -43,17 +43,21 @@ class ArticleCommandService(
         articleCommandPersistencePort.delete(article.id!!.value)
     }
 
-    override fun like(userId: Long, articleId: Long) {
-
+    override fun upsertLike(userId: Long, articleId: Long) {
         val article = articleQueryPersistencePort.findById(articleId)
-
         articleLikeQueryPersistencePort.findByUserIdAndArticleOrNull(userId, article)
-            ?.run { articleLikeCommandPersistencePort.delete(this) }
-            ?: articleLikeCommandPersistencePort.save(
-                ArticleLike(
+            ?.run {
+                articleCommandPersistencePort.upsertLike(
+                    articleLike = this,
+                    article = article.unlike()
+                )
+            }
+            ?: articleCommandPersistencePort.upsertLike(
+                articleLike = ArticleLike(
                     userId = UserId(userId),
                     article = article
-                )
+                ),
+                article = article.like()
             )
     }
 }

community-domain/src/main/kotlin/gloddy/article/Article.kt

@@ -8,12 +8,12 @@ import gloddy.core.UserId
 
 data class Article(
     val userId: UserId,
-    var category: Category,
-    var title: String,
-    var content: String,
-    var image: ArticleImage,
-    var commentCount: Int = 0,
-    var likeCount: Int = 0,
+    val category: Category,
+    val title: String,
+    val content: String,
+    val image: ArticleImage,
+    val commentCount: Int = 0,
+    val likeCount: Int = 0,
     val id: ArticleId? = null,
 ) {
     constructor(
@@ -37,4 +37,14 @@ data class Article(
             throw ArticleNoAuthorizationException()
         }
     }
+
+    fun like(): Article =
+        this.copy(
+            likeCount = this.likeCount + 1
+        )
+
+    fun unlike(): Article =
+        this.copy(
+            likeCount = this.likeCount - 1
+        )
 }

community-in-api/src/main/kotlin/gloddy/controller/article/ArticleCommandController.kt

@@ -36,7 +36,7 @@ class ArticleCommandController(
     @PostMapping("/articles/{articleId}/like")
     override fun like(@RequestHeader("USER_ID") userId: Long, @PathVariable("articleId") articleId: Long)
             : ResponseEntity<CommunityApiResponse<Nothing>> {
-        articleCommandUseCase.like(userId, articleId)
+        articleCommandUseCase.upsertLike(userId, articleId)
         return ApiResponseEntityWrapper<Nothing>().noContent()
     }
 }

community-infrastructure/src/main/kotlin/gloddy/persistence/article/adapter/ArticleCommandPersistenceAdapter.kt

@@ -1,10 +1,12 @@
 package gloddy.persistence.article.adapter
 
 import gloddy.article.Article
+import gloddy.article.ArticleLike
 import gloddy.article.exception.ArticleNotFoundException
 import gloddy.article.port.out.ArticleCommandPersistencePort
 import gloddy.persistence.article.ArticleJpaEntity
 import gloddy.persistence.article.repository.ArticleJpaRepository
+import gloddy.persistence.article.repository.ArticleLikeJpaRepository
 import gloddy.persistence.util.mapper.toDomain
 import gloddy.persistence.util.mapper.toEntity
 import org.springframework.data.repository.findByIdOrNull
@@ -14,7 +16,8 @@ import org.springframework.transaction.annotation.Transactional
 @Component
 @Transactional
 class ArticleCommandPersistenceAdapter(
-    private val articleJpaRepository: ArticleJpaRepository
+    private val articleJpaRepository: ArticleJpaRepository,
+    private val articleLikeJpaRepository: ArticleLikeJpaRepository
 ) : ArticleCommandPersistencePort {
 
     override fun save(article: Article): Article {
@@ -26,6 +29,18 @@ class ArticleCommandPersistenceAdapter(
         articleJpaEntity.changeDeletedToTrue()
     }
 
+    override fun upsertLike(articleLike: ArticleLike, article: Article) {
+        save(article)
+        articleLike
+            .run {
+                if (articleLike.id == null) {
+                    articleLikeJpaRepository.save(this.toEntity())
+                } else {
+                    articleLikeJpaRepository.delete(this.toEntity())
+                }
+            }
+    }
+
     fun find(id: Long): ArticleJpaEntity {
         return articleJpaRepository.findByIdOrNull(id) ?: throw ArticleNotFoundException()
     }