nest-simple-transactional

Simple transaction manager for nestjs/typeorm project. Inspired by nest_transact

Installation

npm install nest-simple-transactional

Usage

import { Transactional } from 'nest-simple-transactional';

@Injectable()
export class SomeService extends Transactional<SomeService> {
  constructor(
      moduleRef: ModuleRef,
      @InjectRepository(SomeEntity)
      private readonly someRepository: Repository<SomeEntity>,
  ) {
      super(moduleRef)
  }

  @Transactional()
  async someMethod() {
    await this.someRepository.save(new SomeEntity());
  }
}

import {DataSource} from "typeorm"; 
@Controller('items')
export class SomeController {
  constructor(
      private readonly someService: SomeService,
      dataSource: DataSource
  ) {}

  @Post()
  async create() {
      this.dataSource.transaction(async (manager) => {
          await this.someService.withTransaction(manager).someMethod();
      })
  }
}

Basic Concepts

As it's said, this is inspired by nest_transact, this package provides simple utility wrapper class. When you extend Transactional class, you can use withTransaction method to replace all dependent EntityManagers which is used by Repositories injected in the class to the one. In short when you call withTransaction, it rebuilds the dependencies with the wanted EntityManger(So, it is a little costly operation, but it's not a big deal in most cases).

Bugs

If you find some bugs or missing features, please create an issue or PR.

License

MIT