javascript - NestJs TypeORM configuration using env files

Question

I have two .env files like dev.env and staging.env. I am using typeorm as my database ORM. I would like to know how to let typeorm read either of the config file whenever I run the application. Error: No connection options were found in any of configurations file from typeormmodule.

Answer 1

You can create a ConfigService that reads in the file corresponding to the environment variable NODE_ENV:

1) Set the NODE_ENV variable in your start scripts:

"start:dev": "cross-env NODE_ENV=dev ts-node -r tsconfig-paths/register src/main.ts",
"start:staging": "cross-env NODE_ENV=staging node dist/src/main.js",

2) Read the corresponding .env file in the ConfigService

@Injectable()
export class ConfigService {
  private readonly envConfig: EnvConfig;

  constructor() {
    this.envConfig = dotenv.parse(fs.readFileSync(`${process.env.NODE_ENV}.env`));
  }

  get databaseHost(): string {
    return this.envConfig.DATABASE_HOST;
  }
}

3) Use the ConfigService to set up your database connection:

TypeOrmModule.forRootAsync({
  imports:[ConfigModule],
  useFactory: async (configService: ConfigService) => ({
    type: configService.getDatabase()
    // ...
  }),
  inject: [ConfigService]
}),