feat: 新增目标子任务管理功能模块

- 实现目标子任务的完整功能，包括数据库表设计、API接口、业务逻辑和文档说明。
- 支持用户创建、管理和跟踪目标子任务，提供增删改查操作及任务完成记录功能。
- 引入惰性任务生成机制，优化任务管理体验，提升系统性能和用户交互。

src/goals/goals.service.ts

@@ -1,17 +1,30 @@
 import { Injectable, Logger, NotFoundException, BadRequestException } from '@nestjs/common';
+import { InjectModel } from '@nestjs/sequelize';
 import { Op, WhereOptions, Order } from 'sequelize';
 import { Goal, GoalStatus, GoalRepeatType } from './models/goal.model';
 import { GoalCompletion } from './models/goal-completion.model';
+import { GoalTask } from './models/goal-task.model';
 import { CreateGoalDto } from './dto/create-goal.dto';
 import { UpdateGoalDto } from './dto/update-goal.dto';
 import { GoalQueryDto } from './dto/goal-query.dto';
 import { CreateGoalCompletionDto } from './dto/goal-completion.dto';
+import { GoalTaskService } from './services/goal-task.service';
 import * as dayjs from 'dayjs';
 
 @Injectable()
 export class GoalsService {
   private readonly logger = new Logger(GoalsService.name);
 
+  constructor(
+    @InjectModel(Goal)
+    private readonly goalModel: typeof Goal,
+    @InjectModel(GoalCompletion)
+    private readonly goalCompletionModel: typeof GoalCompletion,
+    @InjectModel(GoalTask)
+    private readonly goalTaskModel: typeof GoalTask,
+    private readonly goalTaskService: GoalTaskService,
+  ) { }
+
   /**
    * 创建目标
    */
@@ -27,13 +40,13 @@ export class GoalsService {
         throw new BadRequestException('结束日期不能早于开始日期');
       }
 
-      const goal = await Goal.create({
+      const goal = await this.goalModel.create({
         userId,
         ...createGoalDto,
-        startDate: createGoalDto.startDate ? new Date(createGoalDto.startDate) : null,
-        endDate: createGoalDto.endDate ? new Date(createGoalDto.endDate) : null,
-        startTime: createGoalDto.startTime ? createGoalDto.startTime : null,
-        endTime: createGoalDto.endTime ? createGoalDto.endTime : null,
+        startDate: createGoalDto.startDate ? new Date(createGoalDto.startDate) : undefined,
+        endDate: createGoalDto.endDate ? new Date(createGoalDto.endDate) : undefined,
+        startTime: createGoalDto.startTime ? createGoalDto.startTime : undefined,
+        endTime: createGoalDto.endTime ? createGoalDto.endTime : undefined,
       });
 
       this.logger.log(`用户 ${userId} 创建了目标: ${goal.title}`);
@@ -49,6 +62,9 @@ export class GoalsService {
    */
   async getGoals(userId: string, query: GoalQueryDto) {
     try {
+      // 惰性生成任务
+      await this.goalTaskService.generateTasksLazily(userId);
+
       const { page = 1, pageSize = 20, status, repeatType, category, startDate, endDate, sortBy = 'createdAt', sortOrder = 'desc' } = query;
       const offset = (page - 1) * pageSize;
 
@@ -85,7 +101,7 @@ export class GoalsService {
       // 构建排序条件
       const order: Order = [[sortBy, sortOrder.toUpperCase()]];
 
-      const { rows: goals, count } = await Goal.findAndCountAll({
+      const { rows: goals, count } = await this.goalModel.findAndCountAll({
         where,
         order,
         offset,
@@ -97,6 +113,14 @@ export class GoalsService {
             where: { deleted: false },
             required: false,
           },
+          {
+            model: GoalTask,
+            as: 'tasks',
+            where: { deleted: false },
+            required: false,
+            limit: 5, // 只显示最近5个任务
+            order: [['startDate', 'DESC']],
+          },
         ],
       });
 
@@ -117,7 +141,10 @@ export class GoalsService {
    */
   async getGoal(userId: string, goalId: string): Promise<Goal> {
     try {
-      const goal = await Goal.findOne({
+      // 惰性生成任务
+      await this.goalTaskService.generateTasksLazily(userId, goalId);
+
+      const goal = await this.goalModel.findOne({
         where: { id: goalId, userId, deleted: false },
         include: [
           {
@@ -128,6 +155,14 @@ export class GoalsService {
             order: [['completedAt', 'DESC']],
             limit: 10, // 只显示最近10次完成记录
           },
+          {
+            model: GoalTask,
+            as: 'tasks',
+            where: { deleted: false },
+            required: false,
+            order: [['startDate', 'ASC']],
+            limit: 20, // 显示最近20个任务
+          },
         ],
       });
 
@@ -147,7 +182,7 @@ export class GoalsService {
    */
   async updateGoal(userId: string, goalId: string, updateGoalDto: UpdateGoalDto): Promise<Goal> {
     try {
-      const goal = await Goal.findOne({
+      const goal = await this.goalModel.findOne({
         where: { id: goalId, userId, deleted: false },
       });
 
@@ -186,7 +221,7 @@ export class GoalsService {
    */
   async deleteGoal(userId: string, goalId: string): Promise<boolean> {
     try {
-      const goal = await Goal.findOne({
+      const goal = await this.goalModel.findOne({
         where: { id: goalId, userId, deleted: false },
       });
 
@@ -198,7 +233,7 @@ export class GoalsService {
       await goal.update({ deleted: true });
 
       // 软删除相关的完成记录
-      await GoalCompletion.update(
+      await this.goalCompletionModel.update(
         { deleted: true },
         { where: { goalId, userId } }
       );
@@ -216,7 +251,7 @@ export class GoalsService {
    */
   async completeGoal(userId: string, createCompletionDto: CreateGoalCompletionDto): Promise<GoalCompletion> {
     try {
-      const goal = await Goal.findOne({
+      const goal = await this.goalModel.findOne({
         where: { id: createCompletionDto.goalId, userId, deleted: false },
       });
 
@@ -232,7 +267,7 @@ export class GoalsService {
       const completedAt = createCompletionDto.completedAt ? new Date(createCompletionDto.completedAt) : new Date();
 
       // 创建完成记录
-      const completion = await GoalCompletion.create({
+      const completion = await this.goalCompletionModel.create({
         goalId: createCompletionDto.goalId,
         userId,
         completedAt,
@@ -266,7 +301,7 @@ export class GoalsService {
       const offset = (page - 1) * pageSize;
 
       // 验证目标存在
-      const goal = await Goal.findOne({
+      const goal = await this.goalModel.findOne({
         where: { id: goalId, userId, deleted: false },
       });
 
@@ -291,7 +326,7 @@ export class GoalsService {
         }
       }
 
-      const { rows: completions, count } = await GoalCompletion.findAndCountAll({
+      const { rows: completions, count } = await this.goalCompletionModel.findAndCountAll({
         where,
         order: [['completedAt', 'DESC']],
         offset,
@@ -322,7 +357,7 @@ export class GoalsService {
    */
   async getGoalStats(userId: string) {
     try {
-      const goals = await Goal.findAll({
+      const goals = await this.goalModel.findAll({
         where: { userId, deleted: false },
         include: [
           {