feat: 新增用户食物收藏功能

- 创建用户食物收藏表 `t_user_food_favorites`，用于存储用户收藏的食物信息。
- 在 `FoodLibraryController` 中添加收藏和取消收藏食物的 API 接口。
- 在 `FoodLibraryService` 中实现收藏和取消收藏的业务逻辑，并获取用户收藏的食物 ID 列表。
- 更新 DTO 以支持食物是否已收藏的状态。

src/food-library/dto/food-library.dto.ts

@@ -46,6 +46,9 @@ export class FoodItemDto {
 
   @ApiProperty({ description: '是否为用户自定义食物', required: false })
   isCustom?: boolean;
+
+  @ApiProperty({ description: '是否已收藏', required: false })
+  isFavorite?: boolean;
 }
 
 export class FoodCategoryDto {

src/food-library/food-library.controller.ts

@@ -1,4 +1,4 @@
-import { Controller, Get, Post, Delete, Query, Param, ParseIntPipe, NotFoundException, Body, UseGuards } from '@nestjs/common';
+import { Controller, Get, Post, Delete, Query, Param, ParseIntPipe, NotFoundException, Body, UseGuards, HttpStatus } from '@nestjs/common';
 import { ApiTags, ApiOperation, ApiResponse, ApiQuery, ApiParam, ApiBearerAuth } from '@nestjs/swagger';
 import { FoodLibraryService } from './food-library.service';
 import { FoodLibraryResponseDto, FoodItemDto, CreateCustomFoodDto } from './dto/food-library.dto';
@@ -108,4 +108,45 @@ export class FoodLibraryController {
     }
     return food;
   }
+
+  @Post(':id/favorite')
+  @ApiOperation({ summary: '收藏食物' })
+  @ApiParam({ name: 'id', description: '食物ID', type: 'number' })
+  @ApiResponse({
+    status: 201,
+    description: '成功收藏食物',
+  })
+  @ApiResponse({
+    status: 404,
+    description: '食物不存在',
+  })
+  @ApiBearerAuth()
+  @UseGuards(JwtAuthGuard)
+  async favoriteFood(
+    @Param('id', ParseIntPipe) id: number,
+    @CurrentUser() user: AccessTokenPayload
+  ): Promise<{ success: boolean }> {
+    const success = await this.foodLibraryService.favoriteFood(user.sub, id);
+    if (!success) {
+      throw new NotFoundException('食物不存在');
+    }
+    return { success };
+  }
+
+  @Delete(':id/favorite')
+  @ApiOperation({ summary: '取消收藏食物' })
+  @ApiParam({ name: 'id', description: '食物ID', type: 'number' })
+  @ApiResponse({
+    status: 200,
+    description: '成功取消收藏食物',
+  })
+  @ApiBearerAuth()
+  @UseGuards(JwtAuthGuard)
+  async unfavoriteFood(
+    @Param('id', ParseIntPipe) id: number,
+    @CurrentUser() user: AccessTokenPayload
+  ): Promise<{ success: boolean }> {
+    const success = await this.foodLibraryService.unfavoriteFood(user.sub, id);
+    return { success };
+  }
 }

src/food-library/food-library.module.ts

@@ -5,11 +5,12 @@ import { FoodLibraryService } from './food-library.service';
 import { FoodCategory } from './models/food-category.model';
 import { FoodLibrary } from './models/food-library.model';
 import { UserCustomFood } from './models/user-custom-food.model';
+import { UserFoodFavorite } from './models/user-food-favorite.model';
 import { UsersModule } from '../users/users.module';
 
 @Module({
   imports: [
-    SequelizeModule.forFeature([FoodCategory, FoodLibrary, UserCustomFood]),
+    SequelizeModule.forFeature([FoodCategory, FoodLibrary, UserCustomFood, UserFoodFavorite]),
     UsersModule,
   ],
   controllers: [FoodLibraryController],

src/food-library/food-library.service.ts

@@ -4,6 +4,7 @@ import { Op } from 'sequelize';
 import { FoodCategory } from './models/food-category.model';
 import { FoodLibrary } from './models/food-library.model';
 import { UserCustomFood } from './models/user-custom-food.model';
+import { UserFoodFavorite } from './models/user-food-favorite.model';
 import { FoodCategoryDto, FoodItemDto, FoodLibraryResponseDto, CreateCustomFoodDto } from './dto/food-library.dto';
 
 @Injectable()
@@ -15,12 +16,14 @@ export class FoodLibraryService {
     private readonly foodLibraryModel: typeof FoodLibrary,
     @InjectModel(UserCustomFood)
     private readonly userCustomFoodModel: typeof UserCustomFood,
+    @InjectModel(UserFoodFavorite)
+    private readonly userFoodFavoriteModel: typeof UserFoodFavorite,
   ) { }
 
   /**
    * 将系统食物模型转换为DTO
    */
-  private mapFoodToDto(food: FoodLibrary): FoodItemDto {
+  private mapFoodToDto(food: FoodLibrary, isFavorite: boolean = false): FoodItemDto {
     return {
       id: food.id,
       name: food.name,
@@ -37,13 +40,14 @@ export class FoodLibraryService {
       imageUrl: food.imageUrl,
       sortOrder: food.sortOrder,
       isCustom: false,
+      isFavorite,
     };
   }
 
   /**
    * 将用户自定义食物模型转换为DTO
    */
-  private mapCustomFoodToDto(food: UserCustomFood): FoodItemDto {
+  private mapCustomFoodToDto(food: UserCustomFood, isFavorite: boolean = false): FoodItemDto {
     return {
       id: food.id,
       name: food.name,
@@ -60,6 +64,7 @@ export class FoodLibraryService {
       imageUrl: food.imageUrl,
       sortOrder: food.sortOrder,
       isCustom: true,
+      isFavorite,
     };
   }
 
@@ -69,6 +74,9 @@ export class FoodLibraryService {
    */
   async getFoodLibrary(userId?: string): Promise<FoodLibraryResponseDto> {
     try {
+      // 获取用户收藏的食物ID
+      const favoriteIds = userId ? await this.getUserFavoriteIds(userId) : { systemIds: new Set<number>(), customIds: new Set<number>() };
+      
       // 分别获取所有数据
       const [categories, allSystemFoods, commonFoods, userCustomFoods] = await Promise.all([
         // 获取所有分类
@@ -107,14 +115,14 @@ export class FoodLibraryService {
 
         if (category.key === 'common') {
           // 常见分类：使用常见食物（只包含系统食物）
-          allFoods = commonFoods.map((food: FoodLibrary) => this.mapFoodToDto(food));
+          allFoods = commonFoods.map((food: FoodLibrary) => this.mapFoodToDto(food, favoriteIds.systemIds.has(food.id)));
         } else if (category.key === 'custom') {
           // 自定义分类：只包含用户自定义食物
-          allFoods = userCustomFoods.map((food: UserCustomFood) => this.mapCustomFoodToDto(food));
+          allFoods = userCustomFoods.map((food: UserCustomFood) => this.mapCustomFoodToDto(food, favoriteIds.customIds.has(food.id)));
         } else {
           // 其他分类：只包含系统食物
           const systemFoods = systemFoodsByCategory.get(category.key) || [];
-          allFoods = systemFoods.map((food: FoodLibrary) => this.mapFoodToDto(food));
+          allFoods = systemFoods.map((food: FoodLibrary) => this.mapFoodToDto(food, favoriteIds.systemIds.has(food.id)));
         }
 
         return {
@@ -142,6 +150,9 @@ export class FoodLibraryService {
         return [];
       }
 
+      // 获取用户收藏的食物ID
+      const favoriteIds = userId ? await this.getUserFavoriteIds(userId) : { systemIds: new Set<number>(), customIds: new Set<number>() };
+
       const [systemFoods, customFoods] = await Promise.all([
         // 搜索系统食物
         this.foodLibraryModel.findAll({
@@ -168,8 +179,8 @@ export class FoodLibraryService {
 
       // 合并结果，用户自定义食物优先显示
       const allFoods: FoodItemDto[] = [
-        ...customFoods.map((food: UserCustomFood) => this.mapCustomFoodToDto(food)),
-        ...systemFoods.map((food: FoodLibrary) => this.mapFoodToDto(food)),
+        ...customFoods.map((food: UserCustomFood) => this.mapCustomFoodToDto(food, favoriteIds.customIds.has(food.id))),
+        ...systemFoods.map((food: FoodLibrary) => this.mapFoodToDto(food, favoriteIds.systemIds.has(food.id))),
       ];
 
       return allFoods;
@@ -187,10 +198,13 @@ export class FoodLibraryService {
         return null;
       }
 
+      // 获取用户收藏的食物ID
+      const favoriteIds = userId ? await this.getUserFavoriteIds(userId) : { systemIds: new Set<number>(), customIds: new Set<number>() };
+
       // 先尝试从系统食物中查找
       const systemFood = await this.foodLibraryModel.findByPk(id);
       if (systemFood) {
-        return this.mapFoodToDto(systemFood);
+        return this.mapFoodToDto(systemFood, favoriteIds.systemIds.has(id));
       }
 
       // 如果提供了用户ID，则从用户自定义食物中查找
@@ -199,7 +213,7 @@ export class FoodLibraryService {
           where: { id, userId }
         });
         if (customFood) {
-          return this.mapCustomFoodToDto(customFood);
+          return this.mapCustomFoodToDto(customFood, favoriteIds.customIds.has(id));
         }
       }
 
@@ -236,7 +250,7 @@ export class FoodLibraryService {
         sortOrder: maxSortOrder + 1,
       });
 
-      return this.mapCustomFoodToDto(customFood);
+      return this.mapCustomFoodToDto(customFood, false); // 新创建的食物默认未收藏
     } catch (error) {
       throw new Error(`Failed to create custom food: ${error.message}`);
     }
@@ -259,4 +273,79 @@ export class FoodLibraryService {
       throw new Error(`Failed to delete custom food: ${error.message}`);
     }
   }
+
+  /**
+   * 获取用户收藏的食物ID列表
+   */
+  private async getUserFavoriteIds(userId: string): Promise<{ systemIds: Set<number>, customIds: Set<number> }> {
+    try {
+      const favorites = await this.userFoodFavoriteModel.findAll({
+        where: { userId },
+        attributes: ['foodId', 'foodType']
+      });
+
+      const systemIds = new Set<number>();
+      const customIds = new Set<number>();
+
+      favorites.forEach(fav => {
+        if (fav.foodType === 'system') {
+          systemIds.add(fav.foodId);
+        } else {
+          customIds.add(fav.foodId);
+        }
+      });
+
+      return { systemIds, customIds };
+    } catch (error) {
+      throw new Error(`Failed to get user favorite ids: ${error.message}`);
+    }
+  }
+
+  /**
+   * 收藏食物
+   */
+  async favoriteFood(userId: string, foodId: number): Promise<boolean> {
+    try {
+      // 首先检查食物是否存在（系统食物或用户自定义食物）
+      const [systemFood, customFood] = await Promise.all([
+        this.foodLibraryModel.findByPk(foodId),
+        this.userCustomFoodModel.findOne({ where: { id: foodId, userId } })
+      ]);
+
+      if (!systemFood && !customFood) {
+        return false;
+      }
+
+      const foodType = systemFood ? 'system' : 'custom';
+
+      // 使用 upsert 来处理重复收藏
+      await this.userFoodFavoriteModel.upsert({
+        userId,
+        foodId,
+        foodType
+      });
+
+      return true;
+    } catch (error) {
+      throw new Error(`Failed to favorite food: ${error.message}`);
+    }
+  }
+
+  /**
+   * 取消收藏食物
+   */
+  async unfavoriteFood(userId: string, foodId: number): Promise<boolean> {
+    try {
+      const result = await this.userFoodFavoriteModel.destroy({
+        where: {
+          userId,
+          foodId
+        }
+      });
+
+      return result > 0;
+    } catch (error) {
+      throw new Error(`Failed to unfavorite food: ${error.message}`);
+    }
+  }
 }

src/food-library/models/user-food-favorite.model.ts

@@ -0,0 +1,43 @@
+import { Column, DataType, Model, Table } from 'sequelize-typescript';
+
+@Table({
+  tableName: 't_user_food_favorites',
+  underscored: true,
+})
+export class UserFoodFavorite extends Model {
+  @Column({
+    type: DataType.BIGINT,
+    primaryKey: true,
+    autoIncrement: true,
+    comment: '主键ID',
+  })
+  declare id: number;
+
+  @Column({
+    type: DataType.STRING,
+    allowNull: false,
+    comment: '用户ID',
+  })
+  declare userId: string;
+
+  @Column({
+    type: DataType.BIGINT,
+    allowNull: false,
+    comment: '食物ID',
+  })
+  declare foodId: number;
+
+  @Column({
+    type: DataType.ENUM('system', 'custom'),
+    allowNull: false,
+    defaultValue: 'system',
+    comment: '食物类型（system: 系统食物, custom: 用户自定义食物）',
+  })
+  declare foodType: 'system' | 'custom';
+
+  @Column({ type: DataType.DATE, defaultValue: DataType.NOW })
+  declare createdAt: Date;
+
+  @Column({ type: DataType.DATE, defaultValue: DataType.NOW })
+  declare updatedAt: Date;
+}