add decks crud

src/modules/decks/use-cases/delete-deck-by-id-use-case.ts

@@ -0,0 +1,21 @@
+import { CommandHandler, ICommandHandler } from '@nestjs/cqrs'
+import { DecksRepository } from '../infrastructure/decks.repository'
+import { BadRequestException, NotFoundException } from '@nestjs/common'
+
+export class DeleteDeckByIdCommand {
+  constructor(public readonly id: string, public readonly userId: string) {}
+}
+
+@CommandHandler(DeleteDeckByIdCommand)
+export class DeleteDeckByIdHandler implements ICommandHandler<DeleteDeckByIdCommand> {
+  constructor(private readonly deckRepository: DecksRepository) {}
+
+  async execute(command: DeleteDeckByIdCommand) {
+    const deck = await this.deckRepository.findDeckById(command.id)
+    if (!deck) throw new NotFoundException(`Deck with id ${command.id} not found`)
+    if (deck.userId !== command.userId) {
+      throw new BadRequestException(`You can't delete a deck that you don't own`)
+    }
+    return await this.deckRepository.deleteDeckById(command.id)
+  }
+}