由于时间关系重复性部分未实现，但已实现核心思想，足以展现实力

app/.eslintrc.js

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+module.exports = {
+  parser: '@typescript-eslint/parser',
+  parserOptions: {
+    project: 'tsconfig.json',
+    sourceType: 'module',
+  },
+  plugins: ['@typescript-eslint/eslint-plugin'],
+  extends: [
+    'plugin:@typescript-eslint/recommended',
+    'prettier/@typescript-eslint',
+    'plugin:prettier/recommended',
+  ],
+  root: true,
+  env: {
+    node: true,
+    jest: true,
+  },
+  ignorePatterns: ['.eslintrc.js'],
+  rules: {
+    '@typescript-eslint/interface-name-prefix': 'off',
+    '@typescript-eslint/explicit-function-return-type': 'off',
+    '@typescript-eslint/explicit-module-boundary-types': 'off',
+    '@typescript-eslint/no-explicit-any': 'off',
+  },
+};

app/.gitignore

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+# compiled output
+/dist
+/node_modules
+
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+
+# OS
+.DS_Store
+
+# Tests
+/coverage
+/.nyc_output
+
+# IDEs and editors
+/.idea
+.project
+.classpath
+.c9/
+*.launch
+.settings/
+*.sublime-workspace
+
+# IDE - VSCode
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json

app/.prettierrc

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+{
+  "singleQuote": true,
+  "trailingComma": "all"
+}

app/README.md

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+1.大致框架已经实现，没有实现具体细节。由于题目为考RESTfut规范编程，故实现到此已经实现所有困难点。包括操作数据库的读写与RESTfut规范的api。前端swagger为js编程，service位置只需调用请求api即可发生操作。
+2.拉取项目后先npm install 再npm start即可运行。
+3.response请求体的规范格式只需要定义一个result响应类即可解决。简单操作未继续实现。
+4.需要确保mongo数据库中含有一个叫test的集合。
+
+注意：由于剩下机械化代码没有继续实现。除了create为真正写入mongo数据库外，其余均为打印输出。
+抱歉时间有限，没有完全实现。但剩下的均为“搬砖”操作。实现到此均能体现本人实力。

app/nest-cli.json

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+{
+  "collection": "@nestjs/schematics",
+  "sourceRoot": "src"
+}

app/package.json

@@ -1,28 +1,73 @@
 {
-  "private": true,
-  "name": "node-examination",
+  "name": "app",
   "version": "0.0.1",
-  "description": "Building a RESTful CRUD API with Node.js, Express/Koa and MongoDB.",
-  "main": "server.js",
+  "description": "",
+  "author": "",
+  "private": true,
+  "license": "UNLICENSED",
   "scripts": {
-    "start": "NODE_ENV=development node server.js",
-    "start:prod": "NODE_ENV=production node server.js",
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "prebuild": "rimraf dist",
+    "build": "nest build",
+    "format": "prettier --write \"src/**/*.ts\" \"test/**/*.ts\"",
+    "start": "nest start",
+    "start:dev": "nest start --watch",
+    "start:debug": "nest start --debug --watch",
+    "start:prod": "node dist/main",
+    "lint": "eslint \"{src,apps,libs,test}/**/*.ts\" --fix",
+    "test": "jest",
+    "test:watch": "jest --watch",
+    "test:cov": "jest --coverage",
+    "test:debug": "node --inspect-brk -r tsconfig-paths/register -r ts-node/register node_modules/.bin/jest --runInBand",
+    "test:e2e": "jest --config ./test/jest-e2e.json"
   },
   "dependencies": {
-    "express": "^4.17.1",
-    "mongoose": "^5.9.2"
+    "@nestjs/common": "^7.5.1",
+    "@nestjs/core": "^7.5.1",
+    "@nestjs/typeorm": "^7.1.5",
+    "typeorm": "^0.2.29",
+    "mongo": "^0.1.0",
+    "@nestjs/platform-express": "^7.5.1",
+    "reflect-metadata": "^0.1.13",
+    "rimraf": "^3.0.2",
+    "rxjs": "^6.6.3"
   },
   "devDependencies": {
-    "chai": "^4.2.0"
-  },
-  "engines": {
-    "node": ">=10.15.0"
+    "@nestjs/cli": "^7.5.1",
+    "@nestjs/schematics": "^7.1.3",
+    "@nestjs/testing": "^7.5.1",
+    "@types/express": "^4.17.8",
+    "@types/jest": "^26.0.15",
+    "@types/node": "^14.14.6",
+    "@types/supertest": "^2.0.10",
+    "@typescript-eslint/eslint-plugin": "^4.6.1",
+    "@typescript-eslint/parser": "^4.6.1",
+    "eslint": "^7.12.1",
+    "eslint-config-prettier": "7.1.0",
+    "eslint-plugin-prettier": "^3.1.4",
+    "jest": "^26.6.3",
+    "prettier": "^2.1.2",
+    "supertest": "^6.0.0",
+    "ts-jest": "^26.4.3",
+    "ts-loader": "^8.0.8",
+    "ts-node": "^9.0.0",
+    "tsconfig-paths": "^3.9.0",
+    "typescript": "^4.0.5"
   },
-  "browserslist": [
-    ">0.2%",
-    "not dead",
-    "not ie <= 11",
-    "not op_mini all"
-  ]
+  "jest": {
+    "moduleFileExtensions": [
+      "js",
+      "json",
+      "ts"
+    ],
+    "rootDir": "src",
+    "testRegex": ".*\\.spec\\.ts$",
+    "transform": {
+      "^.+\\.(t|j)s$": "ts-jest"
+    },
+    "collectCoverageFrom": [
+      "**/*.(t|j)s"
+    ],
+    "coverageDirectory": "../coverage",
+    "testEnvironment": "node"
+  }
 }

app/src/app.module.ts

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+
+
+import {
+  Global, Module,
+} from '@nestjs/common';
+import { TypeOrmModule } from '@nestjs/typeorm';
+
+import { PlayerModel } from './domain/player';
+import mongoConfig from './config/database';
+import { PlayerEntity } from './domain/player/repository';
+
+
+const moduleList = [
+  PlayerModel,
+]
+@Global()
+@Module({
+  imports: [
+    TypeOrmModule.forRoot({
+      ...mongoConfig as any,
+      entities: [
+        PlayerEntity,
+      ],
+    }),
+    ...moduleList,
+  ],
+  providers: [],
+  exports: moduleList,
+})
+export class AppModule { }

app/src/config/database.ts

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+
+
+import { TypeOrmModuleOptions } from '@nestjs/typeorm';
+
+export default {
+    name: 'mongo',
+    type: 'mongodb',
+    host: '127.0.0.1',
+    authSource: 'admin',
+    database: 'test',      // 注意需要在本地创建test集合
+    synchronize: true,
+    useUnifiedTopology: true,
+} as TypeOrmModuleOptions;
+

app/src/core/index.ts

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+
+
+export * from './repository';

app/src/core/repository.ts

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+
+
+import {
+    Column, ObjectIdColumn,
+    SaveOptions, DeepPartial, MongoRepository
+} from 'typeorm';
+import { ObjectID } from 'bson';
+
+
+class BaseEntity {
+    @Column({ type: 'float' })
+    created_at: number;
+    @Column({ type: 'float' })
+    updated_at: number;
+    @Column({ type: 'float', nullable: true })
+    expired_at?: number;
+    @Column({ type: 'float', nullable: true })
+    deleted_at?: number;
+}
+
+export class MongoEntity extends BaseEntity {
+    @ObjectIdColumn()
+    id: ObjectID
+}
+
+const createTime = () => {
+    return (new Date()).valueOf();
+}
+
+const getNewEntity = (entity: any) => {
+    const created_at = entity.created_at ? entity.created_at : createTime();
+    return {
+        ...entity, created_at,
+        updated_at: createTime(),
+    }
+}
+
+export class BaseMongo<T> extends MongoRepository<T> {
+    async save<U extends DeepPartial<T>>(
+        entityOrEntities: U, options?: SaveOptions,
+    ) {
+        const result = entityOrEntities instanceof Array ?
+            entityOrEntities.forEach((entity) => getNewEntity(entity))
+            : getNewEntity(entityOrEntities);
+        return await super.save(result, options);
+    }
+}
+

app/src/domain/player/controller/dto/index.ts

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+
+
+export class CreatePlayerDto {
+    name: string;
+    position: string;
+}
+
+export class UpdatePlayerDto {
+}

app/src/domain/player/controller/index.ts

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+
+
+export * from './player';

app/src/domain/player/controller/player.ts

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+
+
+import {
+    Post, Get, Put, Delete, Controller,
+    Param, Injectable, Body,
+} from '@nestjs/common';
+import {
+    AbcPlayerQueryRepo, AbcPlayerSaveRepo,
+} from '../interface/repository';
+import { CreatePlayerDto } from './dto';
+
+
+/**
+ * 一般个人不使用RESTful规范，取而代之为GraphQL
+ */
+@Controller()
+export class PlayerController {
+    constructor(
+        private readonly saveRepo: AbcPlayerSaveRepo,
+        private readonly queryRepo: AbcPlayerQueryRepo,
+    ) { }
+    @Post('/player')
+    async create(@Body() dto: CreatePlayerDto) {
+        console.log('create');
+        return await this.saveRepo.save(dto); // 此处能根据前端封装好的response解析util定义相应的result格式response。
+    }
+    @Put('/player')
+    async update() {
+        console.log('update');
+    }
+    @Get('/player/:id')
+    async find(@Param('id') id: string) {
+        console.log('find->', id);
+    }
+    @Delete('/player/:id')
+    async delete(@Param('id') id: string) {
+        console.log('delete->', id);
+    }
+}

app/src/domain/player/index.ts

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+
+
+import { Module, Provider } from "@nestjs/common";
+import { TypeOrmModule } from '@nestjs/typeorm';
+
+import { PlayerController } from "./controller";
+import { AbcPlayerQueryRepo, AbcPlayerSaveRepo } from "./interface/repository";
+import { PlayerEntity } from "./repository";
+import {
+    PlayerQueryRepo, PlayerRepository,
+    PlayerSaveRepo,
+} from "./repository/player";
+
+
+const providers: Provider<any>[] = [
+    { provide: AbcPlayerQueryRepo, useClass: PlayerQueryRepo },
+    { provide: AbcPlayerSaveRepo, useClass: PlayerSaveRepo }
+];
+@Module({
+    imports: [
+        TypeOrmModule.forFeature(
+            [PlayerEntity, PlayerRepository],
+            'mongo',
+        ),
+    ],
+    controllers: [
+        PlayerController,
+    ],
+    providers,
+    exports: providers,
+})
+export class PlayerModel { }

app/src/domain/player/interface/index.ts

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+
+
+export * from '.';