refactor: 公開範囲を列挙型に変更

src/main/kotlin/dev/usbharu/hideout/domain/model/hideout/entity/Post.kt

@@ -6,7 +6,7 @@ data class Post(
     val overview:String? = null,
     val text:String,
     val createdAt:Long,
-    val visibility: Int,
+    val visibility: Visibility,
     val url:String,
     val repostId:Long? = null,
     val replyId:Long? = null

src/main/kotlin/dev/usbharu/hideout/domain/model/hideout/entity/Visibility.kt

@@ -0,0 +1,8 @@
+package dev.usbharu.hideout.domain.model.hideout.entity
+
+enum class Visibility {
+    PUBLIC,
+    UNLISTED,
+    FOLLOWERS,
+    DIRECT
+}

src/main/kotlin/dev/usbharu/hideout/repository/PostRepositoryImpl.kt

@@ -1,6 +1,7 @@
 package dev.usbharu.hideout.repository
 
 import dev.usbharu.hideout.domain.model.hideout.entity.Post
+import dev.usbharu.hideout.domain.model.hideout.entity.Visibility
 import dev.usbharu.hideout.service.IdGenerateService
 import kotlinx.coroutines.Dispatchers
 import org.jetbrains.exposed.sql.*
@@ -33,7 +34,7 @@ class PostRepositoryImpl(database: Database, private val idGenerateService: IdGe
                 it[overview] = post.overview
                 it[text] = post.text
                 it[createdAt] = post.createdAt
-                it[visibility] = post.visibility
+                it[visibility] = post.visibility.ordinal
                 it[url] = post.url
                 it[repostId] = post.repostId
                 it[replyId] = post.replyId
@@ -75,7 +76,7 @@ fun ResultRow.toPost(): Post {
         overview = this[Posts.overview],
         text = this[Posts.text],
         createdAt = this[Posts.createdAt],
-        visibility = this[Posts.visibility],
+        visibility = Visibility.values().first { visibility -> visibility.ordinal == this[Posts.visibility] },
         url = this[Posts.url],
         repostId = this[Posts.repostId],
         replyId = this[Posts.replyId]

src/main/kotlin/dev/usbharu/hideout/service/impl/PostService.kt

@@ -2,6 +2,7 @@ package dev.usbharu.hideout.service.impl
 
 import dev.usbharu.hideout.domain.model.hideout.dto.PostCreateDto
 import dev.usbharu.hideout.domain.model.hideout.entity.Post
+import dev.usbharu.hideout.domain.model.hideout.entity.Visibility
 import dev.usbharu.hideout.repository.IPostRepository
 import dev.usbharu.hideout.repository.Posts
 import dev.usbharu.hideout.repository.UsersFollowers
@@ -36,7 +37,7 @@ class PostService(
         val id = postRepository.generateId()
         val postEntity = Post(
             id, user.id, null, post.text,
-            Instant.now().toEpochMilli(), 0, "${user.url}/posts/$id", null, null
+            Instant.now().toEpochMilli(), Visibility.PUBLIC, "${user.url}/posts/$id", null, null
         )
         postRepository.save(postEntity)
     }
@@ -51,7 +52,7 @@ class PostService(
     ): List<Post> {
         return transaction {
             val select = Posts.select {
-                Posts.visibility.eq(0)
+                Posts.visibility.eq(Visibility.PUBLIC.ordinal)
             }
             if (userId != null) {
                 select.orWhere {