[#94] Backend

https://project.mdnd-it.cc/work_packages/94

SerpentRace_Backend/src/Application/Deck/queries/GetDeckByIdQueryHandler.ts

@@ -0,0 +1,14 @@
+import { IDeckRepository } from '../../../Domain/IRepository/IDeckRepository';
+import { GetDeckByIdQuery } from './GetDeckByIdQuery';
+import { ShortDeckDto } from '../../DTOs/DeckDto';
+import { DeckMapper } from '../../DTOs/Mappers/DeckMapper';
+
+export class GetDeckByIdQueryHandler {
+  constructor(private readonly deckRepo: IDeckRepository) {}
+
+  async execute(query: GetDeckByIdQuery): Promise<ShortDeckDto | null> {
+    const deck = await this.deckRepo.findById(query.id);
+    if (!deck) return null;
+    return DeckMapper.toShortDto(deck);
+  }
+}