[Fix/#107] 퀴즈 오답노트 스크랩

src/app/dashboard/utils/order.ts

@@ -1,5 +1,5 @@
 import { ScrapCardData } from "@/types/scrapCard";
-import { sortByKorean, sortByDateDesc, type SortType } from "@/utils/sorting";
+import { sortByKorean, type SortType } from "@/utils/sorting";
 
 export type { SortType };
 
@@ -11,7 +11,7 @@ export function sortCards(
 	sortType: SortType
 ): ScrapCardData[] {
 	if (sortType === "latest") {
-		return sortByDateDesc(cards, (card) => card.date);
+		return [...cards].reverse();
 	}
 
 	return sortByKorean(cards, (card) => card.term);

src/app/quiz/components/QuizResult.tsx

@@ -27,7 +27,7 @@ export default function QuizResult({
 	onRetry,
 }: QuizResultProps) {
 	const { user } = useAuthCore();
-	const { toggleScrap, isScraped } = useScrap();
+	const { addMultipleToScrap } = useScrap();
 	const { showToast } = useToast();
 	const [isRetrying, setIsRetrying] = useState(false);
 
@@ -42,13 +42,8 @@ export default function QuizResult({
 		}
 
 		try {
-			let scrapCount = 0;
-			for (const question of wrongQuestions) {
-				if (!isScraped(question.term.id)) {
-					await toggleScrap(question.term.id);
-					scrapCount++;
-				}
-			}
+			const termIds = wrongQuestions.map((q) => q.term.id);
+			const scrapCount = await addMultipleToScrap(termIds);
 			showToast(
 				scrapCount > 0
 					? `틀린 문제 ${scrapCount}개를 스크랩했습니다!`

src/contexts/auth/ScrapContext.tsx

@@ -16,6 +16,7 @@ interface ScrapContextType {
 	toggleScrap: (
 		termId: number
 	) => Promise<{ success: boolean; isScraped: boolean }>;
+	addMultipleToScrap: (termIds: number[]) => Promise<number>;
 }
 
 const ScrapContext = createContext<ScrapContextType | null>(null);
@@ -78,11 +79,44 @@ export function ScrapProvider({ children }: { children: ReactNode }) {
 		}
 	};
 
+	/**
+	 * 여러 항목을 한 번에 스크랩에 추가
+	 */
+	const addMultipleToScrap = async (termIds: number[]): Promise<number> => {
+		if (!user || !userData) {
+			return 0;
+		}
+
+		// 이미 스크랩된 항목 제외
+		const newTermIds = termIds.filter((id) => !userData.scrapList.includes(id));
+
+		if (newTermIds.length === 0) {
+			return 0;
+		}
+
+		const newScrapList = [...userData.scrapList, ...newTermIds];
+
+		try {
+			const userRef = doc(db, "users", user.uid);
+			await updateDoc(userRef, {
+				scrapList: newScrapList,
+			});
+
+			updateScrapList(newScrapList);
+
+			return newTermIds.length;
+		} catch (error) {
+			console.error("다중 스크랩 추가 실패:", error);
+			throw error;
+		}
+	};
+
 	return (
 		<ScrapContext.Provider
 			value={{
 				isScraped,
 				toggleScrap,
+				addMultipleToScrap,
 			}}
 		>
 			{children}

src/lib/terms.ts

@@ -151,5 +151,8 @@ export async function getRelatedTerms(
 	relatedIds: number[]
 ): Promise<TermIndexItem[]> {
 	const index = await getTermsIndex();
-	return index.filter((t) => relatedIds.includes(t.id));
+	const indexMap = new Map(index.map((t) => [t.id, t]));
+	return relatedIds
+		.map((id) => indexMap.get(id))
+		.filter(Boolean) as TermIndexItem[];
 }