feat: Add core services for user, category, item, and restaurant management, including caching and ownership verification.

src/cache/cache.keys.ts

@@ -1,7 +1,12 @@
 export const keys = {
   restaurantBySlug: (slug: string) => `restaurant:slug:${slug}`,
-  restaurantCategories: (restaurantId: string) => `restaurant:${restaurantId}:categories`,
+  restaurantById: (id: string) => `restaurant:id:${id}`,
+  restaurantCategories: (restaurantId: string) =>
+    `restaurant:${restaurantId}:categories`,
   restaurantItems: (restaurantId: string) => `restaurant:${restaurantId}:items`,
+  userRestaurants: (ownerId: string) => `user:${ownerId}:restaurants`,
   category: (categoryId: string) => `category:${categoryId}`,
+  categoryItems: (categoryId: string) => `category:${categoryId}:items`,
   item: (itemId: string) => `item:${itemId}`,
+  user: (userId: string) => `user:${userId}`,
 };

src/category/category.service.ts

@@ -16,22 +16,31 @@ export class CategoryService {
   ) {}
 
   async _getCategorie(categoryId: string) {
-    const category = await this.prisma.category.findFirstOrThrow({
-      where: { id: categoryId },
-      include: { items: true, restaurant: true },
-    }).catch(() => {
-      throw new NotFoundException('Category not found');
-    });
+    const cacheKey = keys.category(categoryId);
+    const cached = await this.cache.get(cacheKey);
+    if (cached) return cached;
 
+    const category = await this.prisma.category
+      .findFirstOrThrow({
+        where: { id: categoryId },
+        include: { items: true, restaurant: true },
+      })
+      .catch(() => {
+        throw new NotFoundException('Category not found');
+      });
+
+    await this.cache.set(cacheKey, category, 600);
     return category;
   }
 
   async create(dto: CreateCategoryDto, userId: string) {
-    const restaurant = await this.prisma.restaurant.findUniqueOrThrow({
-      where: { id: dto.restaurantId },
-    }).catch(() => {
-      throw new NotFoundException('Restaurant not found');
-    });
+    const restaurant = await this.prisma.restaurant
+      .findUniqueOrThrow({
+        where: { id: dto.restaurantId },
+      })
+      .catch(() => {
+        throw new NotFoundException('Restaurant not found');
+      });
 
     await this.restaurantService.verifyOwnership(userId, restaurant.id);
 
@@ -51,19 +60,31 @@ export class CategoryService {
 
   async findAllForRestaurant(restaurantId: string, userId: string) {
     await this.restaurantService.verifyOwnership(userId, restaurantId);
-    
+
+    const cacheKey = keys.restaurantCategories(restaurantId);
+    const cached = await this.cache.get(cacheKey);
+    if (cached) return cached;
+
     const categories = await this.prisma.category.findMany({
       where: { restaurantId },
       include: { items: true },
     });
 
-    return categories.map(CategoryDto.fromEntity);
+    const result = categories.map(CategoryDto.fromEntity);
+    await this.cache.set(cacheKey, result, 300);
+    return result;
   }
 
   async findOne(id: string) {
-    const category = await this._getCategorie(id);
+    const cacheKey = keys.category(id);
+    const cached = await this.cache.get(cacheKey);
+    if (cached) return cached;
 
-    return CategoryDto.fromEntity(category);
+    const category = await this._getCategorie(id);
+    const result = CategoryDto.fromEntity(category);
+
+    await this.cache.set(cacheKey, result, 600);
+    return result;
   }
 
   async update(id: string, dto: UpdateCategoryDto, userId: string) {

src/item/item.service.ts

@@ -36,33 +36,54 @@ export class ItemService {
       await this.cache.del(keys.restaurantBySlug(category.restaurant.slug));
     }
     await this.cache.del(keys.restaurantCategories(category.restaurantId));
+    await this.cache.del(keys.restaurantItems(category.restaurantId));
+    await this.cache.del(keys.categoryItems(category.id));
+    await this.cache.del(keys.category(category.id));
 
     return MenuItemDto.fromEntity(item);
   }
 
   async findAllByCategory(categoryId: string) {
+    const cacheKey = keys.categoryItems(categoryId);
+    const cached = await this.cache.get(cacheKey);
+    if (cached) return cached;
+
     const items = await this.prisma.menuItem.findMany({
       where: { categoryId },
       orderBy: { createdAt: 'desc' },
     });
 
-    return items.map(MenuItemDto.fromEntity);
+    const result = items.map(MenuItemDto.fromEntity);
+    await this.cache.set(cacheKey, result, 300);
+    return result;
   }
   async findAllForRestaurant(restaurantId: string) {
+    const cacheKey = keys.restaurantItems(restaurantId);
+    const cached = await this.cache.get(cacheKey);
+    if (cached) return cached;
+
     const items = await this.prisma.menuItem.findMany({
       where: { restaurantId },
       orderBy: { createdAt: 'desc' },
     });
 
-    return items.map(MenuItemDto.fromEntity);
+    const result = items.map(MenuItemDto.fromEntity);
+    await this.cache.set(cacheKey, result, 300);
+    return result;
   }
 
   async findOne(id: string) {
+    const cacheKey = keys.item(id);
+    const cached = await this.cache.get(cacheKey);
+    if (cached) return cached;
+
     const item = await this.prisma.menuItem.findUnique({ where: { id } });
 
     if (!item) throw new NotFoundException('Menu item not found');
 
-    return MenuItemDto.fromEntity(item);
+    const result = MenuItemDto.fromEntity(item);
+    await this.cache.set(cacheKey, result, 600);
+    return result;
   }
 
   async update(id: string, dto: UpdateItemDto, userId: string) {
@@ -89,6 +110,16 @@ export class ItemService {
       await this.cache.del(keys.restaurantBySlug(category.restaurant.slug));
     }
     await this.cache.del(keys.restaurantCategories(category.restaurantId));
+    await this.cache.del(keys.restaurantItems(category.restaurantId));
+    await this.cache.del(keys.categoryItems(category.id));
+    await this.cache.del(keys.category(category.id));
+    await this.cache.del(keys.item(id));
+
+    // If category changed, invalidate old category caches too
+    if (dto.categoryId && dto.categoryId !== item.categoryId) {
+      await this.cache.del(keys.categoryItems(item.categoryId));
+      await this.cache.del(keys.category(item.categoryId));
+    }
 
     return MenuItemDto.fromEntity(updated);
   }
@@ -106,6 +137,10 @@ export class ItemService {
       await this.cache.del(keys.restaurantBySlug(category.restaurant.slug));
     }
     await this.cache.del(keys.restaurantCategories(category.restaurantId));
+    await this.cache.del(keys.restaurantItems(category.restaurantId));
+    await this.cache.del(keys.categoryItems(category.id));
+    await this.cache.del(keys.category(category.id));
+    await this.cache.del(keys.item(id));
 
     return deleted;
   }

src/restaurant/restaurant.service.ts

@@ -40,15 +40,23 @@ export class RestaurantService {
       },
     });
 
+    await this.cache.del(keys.userRestaurants(ownerId));
+
     return RestaurantDto.fromEntity(restaurant);
   }
 
   async findByOwner(ownerId: string) {
+    const cacheKey = keys.userRestaurants(ownerId);
+    const cached = await this.cache.get(cacheKey);
+    if (cached) return cached;
+
     const restaurants = await this.prisma.restaurant.findMany({
       where: { ownerId },
     });
 
-    return restaurants.map(RestaurantDto.fromEntity);
+    const result = restaurants.map(RestaurantDto.fromEntity);
+    await this.cache.set(cacheKey, result, 300);
+    return result;
   }
 
   async findAll() {
@@ -57,6 +65,10 @@ export class RestaurantService {
   }
 
   async findOne(id: string) {
+    const cacheKey = keys.restaurantById(id);
+    const cached = await this.cache.get(cacheKey);
+    if (cached) return cached;
+
     const restaurant = await this.prisma.restaurant.findUnique({
       where: { id },
     });
@@ -65,7 +77,9 @@ export class RestaurantService {
       throw new NotFoundException('Restaurant not found');
     }
 
-    return RestaurantDto.fromEntity(restaurant);
+    const result = RestaurantDto.fromEntity(restaurant);
+    await this.cache.set(cacheKey, result, 600);
+    return result;
   }
 
   async findMyRestaurant(id: string, userId: string) {
@@ -113,8 +127,10 @@ export class RestaurantService {
 
     // Invalidate cache by slug and by id
     await this.cache.del(keys.restaurantBySlug(updated.slug));
+    await this.cache.del(keys.restaurantById(updated.id));
     await this.cache.del(keys.restaurantCategories(updated.id));
     await this.cache.del(keys.restaurantItems(updated.id));
+    await this.cache.del(keys.userRestaurants(userId));
 
     return RestaurantDto.fromEntity(updated);
   }
@@ -125,8 +141,10 @@ export class RestaurantService {
 
     // invalidate
     await this.cache.del(keys.restaurantBySlug(deleted.slug));
+    await this.cache.del(keys.restaurantById(deleted.id));
     await this.cache.del(keys.restaurantCategories(deleted.id));
     await this.cache.del(keys.restaurantItems(deleted.id));
+    await this.cache.del(keys.userRestaurants(userId));
 
     return deleted;
   }

src/user/user.module.ts

@@ -2,9 +2,10 @@ import { Module } from '@nestjs/common';
 import { UserController } from './user.controller';
 import { UserService } from './user.service';
 import { PrismaModule } from 'src/prisma/prisma.module';
+import { CacheModule } from 'src/cache/cache.module';
 
 @Module({
-  imports: [PrismaModule],
+  imports: [PrismaModule, CacheModule],
   controllers: [UserController],
   providers: [UserService],
 })

src/user/user.service.ts

@@ -1,9 +1,14 @@
 import { Injectable, NotFoundException } from '@nestjs/common';
 import { PrismaService } from 'src/prisma/prisma.service';
+import { CacheService } from 'src/cache/cache.service';
+import { keys } from 'src/cache/cache.keys';
 
 @Injectable()
 export class UserService {
-  constructor(private readonly prisma: PrismaService) {}
+  constructor(
+    private readonly prisma: PrismaService,
+    private readonly cache: CacheService,
+  ) {}
 
   async getAllUsers() {
     return this.prisma.user.findMany({
@@ -12,11 +17,17 @@ export class UserService {
   }
 
   async getUserById(id: string) {
+    const cacheKey = keys.user(id);
+    const cached = await this.cache.get(cacheKey);
+    if (cached) return cached;
+
     const user = await this.prisma.user.findUnique({
       where: { id },
       include: { accounts: true, sessions: true, restaurants: true },
     });
     if (!user) throw new NotFoundException('User not found');
+
+    await this.cache.set(cacheKey, user, 600);
     return user;
   }
 
@@ -25,7 +36,14 @@ export class UserService {
     await this.prisma.session.deleteMany({ where: { userId: id } });
     await this.prisma.account.deleteMany({ where: { userId: id } });
     await this.prisma.restaurant.deleteMany({ where: { ownerId: id } });
-    return this.prisma.user.delete({ where: { id } });
+
+    const deleted = await this.prisma.user.delete({ where: { id } });
+
+    // Invalidate caches
+    await this.cache.del(keys.user(id));
+    await this.cache.del(keys.userRestaurants(id));
+
+    return deleted;
   }
 
   async getSessionsByUserId(id: string) {