favorites favorites.service.ts

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  import { PrismaClient } from '@prisma/client';
 
const prisma = new PrismaClient();
 
/**
 * 获取用户收藏列表（收藏的是书籍）
 */
export async function getFavorites(userId: string) {
  const userIdNum = parseInt(userId);
 
  const favorites = await prisma.favorite.findMany({
    where: { userId: userIdNum },
    include: {
      book: {
        select: {
          id: true,
          title: true,
          subtitle: true,
          description: true,
          coverUrl: true,
          createdAt: true,
        },
      },
    },
    orderBy: { createdAt: 'desc' },
  });
 
  return favorites;
}
 
/**
 * 添加收藏（收藏书籍）
 */
export async function addFavorite(userId: string, bookId: number) {
  const userIdNum = parseInt(userId);
 
  // 检查是否已存在
  const existing = await prisma.favorite.findUnique({
    where: {
      userId_bookId: {
        userId: userIdNum,
        bookId,
      },
    },
  });
 
  if (existing) {
    return existing;
  }
 
  return await prisma.favorite.create({
    data: {
      userId: userIdNum,
      bookId,
    },
    include: {
      book: {
        select: {
          id: true,
          title: true,
          subtitle: true,
          description: true,
          coverUrl: true,
          createdAt: true,
        },
      },
    },
  });
}
 
/**
 * 取消收藏
 */
export async function removeFavorite(userId: string, bookId: number) {
  const userIdNum = parseInt(userId);
 
  return await prisma.favorite.delete({
    where: {
      userId_bookId: {
        userId: userIdNum,
        bookId,
      },
    },
  });
}
 
/**
 * 检查是否已收藏
 */
export async function isFavorited(userId: string, bookId: number) {
  const userIdNum = parseInt(userId);
 
  const favorite = await prisma.favorite.findUnique({
    where: {
      userId_bookId: {
        userId: userIdNum,
        bookId,
      },
    },
  });
 
  return !!favorite;
}