fix learn endpoint

src/modules/decks/use-cases/get-all-cards-in-deck-use-case.ts

@@ -1,8 +1,9 @@
 import { ForbiddenException, NotFoundException } from '@nestjs/common'
 import { CommandHandler, ICommandHandler } from '@nestjs/cqrs'
+import { omit } from 'remeda'
 
 import { GetAllCardsInDeckDto } from '../../cards/dto'
-import { PaginatedCards } from '../../cards/entities/cards.entity'
+import { PaginatedCards, PaginatedCardsWithGrade } from '../../cards/entities/cards.entity'
 import { CardsRepository } from '../../cards/infrastructure/cards.repository'
 import { DecksRepository } from '../infrastructure/decks.repository'
 
@@ -20,6 +21,24 @@ export class GetAllCardsInDeckHandler implements ICommandHandler<GetAllCardsInDe
     private readonly cardsRepository: CardsRepository,
     private readonly decksRepository: DecksRepository
   ) {}
+  private transformGrade(cards: PaginatedCardsWithGrade): PaginatedCards {
+    return {
+      ...cards,
+      items: cards.items.map(card => {
+        if (card.grades.length === 0) return omit({ ...card, grade: 0 }, ['grades'])
+
+        const grade = card.grades.reduce((acc, grade) => acc + grade.grade, 0) / card.grades.length
+
+        return omit(
+          {
+            ...card,
+            grade,
+          },
+          ['grades']
+        )
+      }),
+    }
+  }
 
   async execute(command: GetAllCardsInDeckCommand): Promise<PaginatedCards> {
     const deck = await this.decksRepository.findDeckById(command.deckId)
@@ -29,7 +48,12 @@ export class GetAllCardsInDeckHandler implements ICommandHandler<GetAllCardsInDe
     if (deck.userId !== command.userId && deck.isPrivate) {
       throw new ForbiddenException(`You can't get a private deck that you don't own`)
     }
+    const cards = await this.cardsRepository.findCardsByDeckId(
+      command.deckId,
+      command.userId,
+      command.params
+    )
 
-    return await this.cardsRepository.findCardsByDeckId(command.deckId, command.params)
+    return this.transformGrade(cards)
   }
 }