Init project. Create simple backend. Add postgres in docker

backend/src/configuration/configuration.ts

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+import { TypeOrmModuleOptions } from '@nestjs/typeorm';
+import { IDatabaseConfigKey } from './database';
+
+const config = {};
+
+export type IConfig = typeof config & {
+  [k in IDatabaseConfigKey]: TypeOrmModuleOptions;
+};
+
+const getConfig = () => config;
+export default getConfig;

backend/src/configuration/database.ts

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+import { registerAs } from '@nestjs/config';
+import { TypeOrmModuleOptions } from '@nestjs/typeorm';
+
+export const DatabaseConfigKey = 'database';
+export type IDatabaseConfigKey = typeof DatabaseConfigKey;
+
+export default registerAs(
+  DatabaseConfigKey,
+  (): TypeOrmModuleOptions => ({
+    type: 'postgres',
+    host: process.env.DATABASE_HOST,
+    port: +(process.env.DATABASE_PORT ?? 5432),
+    username: process.env.DATABASE_USER,
+    password: process.env.DATABASE_PASSWORD,
+    database: process.env.DATABASE_DATABASE,
+    synchronize: process.env.NODE_ENV !== 'production',
+    autoLoadEntities: true,
+  }),
+);

backend/src/controllers/message/index.ts

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+import { MessageController } from './message.controller';
+
+export default MessageController;

backend/src/controllers/message/message.controller.ts

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+import Message, { CreateMessageDTO } from '@/entities/message';
+import MessageService from '@/shared/services/message';
+import { Body, Controller, Get, Post } from '@nestjs/common';
+
+@Controller('message')
+export class MessageController {
+  constructor(private messageService: MessageService) {}
+
+  @Get()
+  async getTopOfHistory(): Promise<Message[]> {
+    return await this.messageService.getTopOfHistory();
+  }
+
+  @Post()
+  async send(@Body() message: CreateMessageDTO): Promise<Message> {
+    return await this.messageService.addMessage(message);
+  }
+}

backend/src/entities/message/index.ts

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+import { Message } from './message';
+export default Message;
+
+export { CreateMessageDTO } from './types';

backend/src/entities/message/message.ts

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+import { Entity, Column, PrimaryGeneratedColumn } from 'typeorm';
+
+@Entity()
+export class Message {
+  @PrimaryGeneratedColumn()
+  id: number;
+
+  @Column()
+  timeOfSend: string;
+
+  @Column()
+  sender: string;
+}

backend/src/entities/message/types.ts

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+import { ApiProperty } from '@nestjs/swagger';
+import { IsNotEmpty } from 'class-validator';
+
+export class CreateMessageDTO {
+  @ApiProperty()
+  @IsNotEmpty()
+  public timeOfSend: string;
+
+  @ApiProperty()
+  @IsNotEmpty()
+  public sender: string;
+}

backend/src/main.ts

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+import { NestFactory } from '@nestjs/core';
+import { SwaggerModule, DocumentBuilder } from '@nestjs/swagger';
+import { ValidationPipe } from '@nestjs/common';
+
+import AppModule from './modules/app';
+
+async function bootstrap() {
+  const app = await NestFactory.create(AppModule);
+  app.useGlobalPipes(new ValidationPipe());
+
+  const options = new DocumentBuilder()
+    .setTitle('Chat')
+    .setDescription(
+      'Chat - Asynchronous chat on WebSockets written on Next+Nest',
+    )
+    .build();
+  const document = SwaggerModule.createDocument(app, options);
+  SwaggerModule.setup('docs', app, document);
+
+  await app.listen(process.env.PORT ?? 8000);
+}
+bootstrap();

backend/src/modules/app/app.module.ts

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+import { Module } from '@nestjs/common';
+import { TypeOrmModule } from '@nestjs/typeorm';
+import { ConfigModule } from '@nestjs/config';
+
+import config from '@/configuration/configuration';
+import databaseConfig from '@/configuration/database';
+import MessageModule from '../message';
+
+@Module({
+  imports: [
+    ConfigModule.forRoot({
+      isGlobal: true,
+      load: [config],
+    }),
+    TypeOrmModule.forRoot(databaseConfig()),
+
+    MessageModule,
+  ],
+})
+export class AppModule {}

backend/src/modules/app/index.ts

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+import { AppModule } from './app.module';
+
+export default AppModule;

backend/src/modules/message/index.ts

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+import { MessageModule } from './message.module';
+
+export default MessageModule;

backend/src/modules/message/message.module.ts

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+import MessageController from '@/controllers/message';
+import Message from '@/entities/message';
+import MessageService from '@/shared/services/message';
+import { Module } from '@nestjs/common';
+import { TypeOrmModule } from '@nestjs/typeorm';
+
+@Module({
+  imports: [TypeOrmModule.forFeature([Message])],
+  controllers: [MessageController],
+  providers: [MessageService],
+})
+export class MessageModule {}

backend/src/shared/services/message/index.ts

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+import { MessageService } from './message.service';
+
+export default MessageService;

backend/src/shared/services/message/message.service.ts

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+import Message, { CreateMessageDTO } from '@/entities/message';
+import { Injectable } from '@nestjs/common';
+import { InjectRepository } from '@nestjs/typeorm';
+import { Repository } from 'typeorm';
+
+@Injectable()
+export class MessageService {
+  constructor(
+    @InjectRepository(Message)
+    private messageRepository: Repository<Message>,
+  ) {}
+
+  getTopOfHistory = () =>
+    this.messageRepository
+      .createQueryBuilder('message')
+      .orderBy('message.id', 'DESC')
+      .limit(20)
+      .getMany();
+
+  addMessage = (message: CreateMessageDTO): Promise<Message> =>
+    this.messageRepository.save(message);
+}