feat: baseEntity 생성 & FeedEntity 골격만 생성

sns_service/src/main/kotlin/joryu/sns_service/SnsServiceApplication.kt

@@ -2,10 +2,12 @@ package joryu.sns_service
 
 import org.springframework.boot.autoconfigure.SpringBootApplication
 import org.springframework.boot.runApplication
+import org.springframework.data.jpa.repository.config.EnableJpaAuditing
 
+@EnableJpaAuditing
 @SpringBootApplication
 class SnsServiceApplication
 
 fun main(args: Array<String>) {
-	runApplication<SnsServiceApplication>(*args)
+    runApplication<SnsServiceApplication>(*args)
 }

sns_service/src/main/kotlin/joryu/sns_service/feed/entity/Feed.kt

@@ -0,0 +1,30 @@
+package joryu.sns_service.feed.entity
+
+import jakarta.persistence.Column
+import jakarta.persistence.Entity
+import jakarta.persistence.GeneratedValue
+import jakarta.persistence.GenerationType
+import jakarta.persistence.Id
+import jakarta.persistence.Table
+import joryu.sns_service.profile.entity.BaseEntity
+
+@Table(name = "feed")
+@Entity
+class Feed(
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    val id: Long,
+
+    content: String,
+) : BaseEntity() {
+    constructor() : this(0, "")
+    constructor(content: String) : this(0, content)
+
+    @Column(name = "view_count", nullable = false)
+    var viewCount: Long = 0
+        private set
+
+    @Column(name = "content", nullable = false, length = 1000)
+    var content: String = content
+        private set
+}

sns_service/src/main/kotlin/joryu/sns_service/feed/repository/FeedRepository.kt

@@ -0,0 +1,6 @@
+package joryu.sns_service.feed.repository
+
+import joryu.sns_service.feed.entity.Feed
+import org.springframework.data.jpa.repository.JpaRepository
+
+interface FeedRepository : JpaRepository<Feed, Long>

sns_service/src/main/kotlin/joryu/sns_service/profile/entity/BaseEntity.kt

@@ -0,0 +1,24 @@
+package joryu.sns_service.profile.entity
+
+import jakarta.persistence.Column
+import jakarta.persistence.EntityListeners
+import jakarta.persistence.MappedSuperclass
+import org.springframework.data.annotation.CreatedDate
+import org.springframework.data.annotation.LastModifiedDate
+import org.springframework.data.jpa.domain.support.AuditingEntityListener
+import java.time.LocalDateTime
+
+@MappedSuperclass
+@EntityListeners(AuditingEntityListener::class)
+abstract class BaseEntity {
+
+    @CreatedDate
+    @Column(name = "create_at", nullable = false, updatable = false)
+    var createAt: LocalDateTime = LocalDateTime.now()
+        private set
+
+    @LastModifiedDate
+    @Column(name = "update_at", nullable = false)
+    var updateAt: LocalDateTime = LocalDateTime.now()
+        private set
+}

sns_service/src/test/kotlin/joryu/sns_service/feed/entity/FeedEntityTest.kt

@@ -0,0 +1,51 @@
+package joryu.sns_service.feed.entity
+
+import jakarta.persistence.EntityManager
+import joryu.sns_service.feed.repository.FeedRepository
+import org.assertj.core.api.Assertions.assertThat
+import org.junit.jupiter.api.Disabled
+import org.junit.jupiter.api.Test
+import org.springframework.beans.factory.annotation.Autowired
+import org.springframework.boot.test.context.SpringBootTest
+import org.springframework.transaction.annotation.Transactional
+import java.time.LocalDateTime
+
+@Transactional
+@SpringBootTest
+@Disabled("프로젝트 초기 kotlin entity 테스트용도. springBootTest라 속도가 느려서 disabled.")
+class FeedEntityTest {
+
+    @Autowired
+    lateinit var em: EntityManager
+
+    @Autowired
+    lateinit var feedRepository: FeedRepository
+
+    @Test
+    fun `BaseEntity에 createAt, updateAt이 잘 들어가야 한다`() {
+        val before = LocalDateTime.now()
+        val feedEntity = feedRepository.save(Feed("123"))
+
+        em.flush()
+        em.clear()
+
+        val findFeedEntity = feedRepository.getReferenceById(feedEntity.id)
+
+        assertThat(findFeedEntity.createAt).isNotNull()
+        assertThat(findFeedEntity.createAt).isAfter(before)
+        assertThat(findFeedEntity.createAt).isBefore(LocalDateTime.now())
+        assertThat(findFeedEntity.updateAt).isNotNull()
+        assertThat(findFeedEntity.updateAt).isAfter(before)
+        assertThat(findFeedEntity.updateAt).isBefore(LocalDateTime.now())
+    }
+
+    @Test
+    fun `BaseEntity의 Id는 auto increment 되어야 한다`() {
+        val feedEntity1 = feedRepository.save(Feed("123"))
+        val feedEntity2 = feedRepository.save(Feed("123"))
+        val feedEntity3 = feedRepository.save(Feed("123"))
+
+        assertThat(feedEntity1.id).isLessThan(feedEntity2.id)
+        assertThat(feedEntity2.id).isLessThan(feedEntity3.id)
+    }
+}