required = false 인 파라미터 전부 옵셔널 파라미터로 변경

src/main/kotlin/kr/co/vividnext/sodalive/content/theme/AudioContentThemeController.kt

@@ -29,7 +29,7 @@ class AudioContentThemeController(private val service: AudioContentThemeService)
     @GetMapping("/{id}/content")
     fun getContentByTheme(
         @PathVariable id: Long,
-        @RequestParam("sort-type", required = false) sortType: SortType = SortType.NEWEST,
+        @RequestParam("sort-type", required = false) sortType: SortType? = SortType.NEWEST,
         @AuthenticationPrincipal(expression = "#this == 'anonymousUser' ? null : member") member: Member?,
         pageable: Pageable
     ) = run {
@@ -38,7 +38,7 @@ class AudioContentThemeController(private val service: AudioContentThemeService)
         ApiResponse.ok(
             service.getContentByTheme(
                 themeId = id,
-                sortType = sortType,
+                sortType = sortType ?: SortType.NEWEST,
                 member = member,
                 offset = pageable.offset,
                 limit = pageable.pageSize.toLong()