Todo App example in NestJS - a Node framework inspired heavily by Angular

todo.controller.ts

import {
  Body,
  Controller,
  Delete,
  Get,
  Param,
  Post,
  Put,
} from '@nestjs/common';
import { toPromise } from 'src/shared/utils';
import { CreateTodoDto } from './dto/create-todo.dto';
import { TodoListDto } from './dto/rodoList.dto';
import { TodoDto } from './dto/todo.dto';
import { TodoService } from './todo.service';

@Controller('api/todos')
export class TodoController {
  constructor(private readonly todoService: TodoService) {}

  @Get()
  async findAll(): Promise<TodoListDto> {
    const todos = await this.todoService.getAllTodos();
    return toPromise({ todos });
  }

  @Get()
  async findOne(@Param('id') id: string): Promise<TodoDto> {
    return await this.todoService.getOneTodo(id);
  }

  @Put(':id')
  async update(
    @Param('id') id: string,
    @Body() todoDto: TodoDto,
  ): Promise<TodoDto> {
    return await this.todoService.updateTodo(todoDto);
  }
}

todo.entity.ts

import { TaskEntity } from '@task/entities/task.entity';
import {
  Entity,
  PrimaryGeneratedColumn,
  Column,
  CreateDateColumn,
  ManyToOne,
  OneToMany,
} from 'typeorm';

@Entity('todo')
export class TodoEntity {
  @PrimaryGeneratedColumn('uuid') id: string;
  @Column({ type: 'varchar', nullable: false }) name: string;
  @Column({ type: 'text', nullable: false }) description?: string;
  @CreateDateColumn() createdOn?: Date;
  @CreateDateColumn() updatedOn?: Date;

  @OneToMany(() => TaskEntity, (task) => task.todo) tasks?: TaskEntity[];
}

todo.module.ts

import { Module } from '@nestjs/common';
import { TypeOrmModule } from '@nestjs/typeorm';
import { TodoController } from './todo.controller';
import { TodoService } from './todo.service';
import { TodoEntity } from '@todo/entity/todo.entity';
import { TaskEntity } from '@task/entities/task.entity';

@Module({
  imports: [TypeOrmModule.forFeature([TodoEntity, TaskEntity])],
  controllers: [TodoController],
  providers: [TodoService],
})
export class TodoModule {}

todo.service.ts

import { HttpException, HttpStatus, Injectable } from '@nestjs/common';
import { v4 as uuid } from 'uuid';
import { todos } from 'src/mock.todos.mock';
import { TodoEntity } from '@todo/entity/todo.entity';
import { TodoDto } from './dto/todo.dto';
import { toPromise } from 'src/shared/utils';
import { toTodoDto } from 'src/shared/mapper';
import { TodoListDto } from './dto/rodoList.dto';
import { CreateTodoDto } from './dto/create-todo.dto';

@Injectable()
export class TodoService {
  todos: TodoEntity[] = todos;

  async getAllTodos(): Promise<TodoDto[]> {
    return todos.map((todo) => toTodoDto(todo));
  }

  async getOneTodo(id: string): Promise<TodoDto> {
    const todo = this.todos.find((todo) => todo.id === id);

    if (!todo) {
      throw new HttpException(
        `Todo item doesn't exist`,
        HttpStatus.BAD_REQUEST,
      );
    }

    return toPromise(toTodoDto(todo));
  }

  async createTodo(createTodoDto: CreateTodoDto): Promise<TodoDto> {
    const { name, description } = createTodoDto;

    const todo: TodoEntity = {
      id: uuid(),
      name,
      description,
    };

    this.todos.push(todo);
    return toPromise(toTodoDto(todo));
  }