Add: Logger and ValidationPipe

[doylefermi-kv]

1. Using the Logger -

...
import { LoggerService } from 'src/logger/logger.service';

@Resolver('User')
export class UserResolver {
  private readonly logger: LoggerService = LoggerService.getInstance(
    UserResolver.name,
  );

  constructor(private userService: UserService) {}

  @Query()
  getUsers(): Promise<User[]> {
    this.logger.info('Starting getUsers()');
    return this.userService.getAllUsers();
  }
...

2. Added validation pipe.

[jinilcs]

Will it throw error if middleName is optional and not passed in request?

[doylefermi-kv]

No, MiddleName will remain as an optional field. No error will be thrown. However, this will remain as an additional validation over the existing graphql validation that MiddleName is a string.

[jinilcs]

Will it be handled in exception filter and sent the custom error response?
Also if validation fails for multiple fields, will it send all error messages in single response?

[doylefermi-kv]

Hi @jinilcs , yes the validation thrown will be handled by the custom error response. Also, all the validations will be collated together -

Example:

{
  "errors": [
    {
      "message": "Failed to validate the input payload",
      "path": [
        "createUser"
      ],
      "extensions": {
        "statusCode": 400,
        "error": "\"email\" must be a valid email. \"firstName\" is not allowed to be empty"
      }
    }
  ],
  "data": {
    "createUser": null
  }
}```