hey everyone, I've been trying to grasp the ApplyT cause I'm loosing the current scope trying to do this:

pgaConfig := cluster.pgaPassword.Result.ApplyT(func(pgaPassword string) string {
  println(fmt.Sprintf("%v", cluster.cfg.Databases))
  return cluster.preparePgaConfig(pgaCfg.ApiKey, pgaPassword)
}).(pulumi.StringOutput)

if I have many 'cluster' resources, e.g iterating over an array of clusters and generating resources, then inside ApplyT

preparePgaConfig

is called on the last cluster, not each. How do I pass the 'context' in there?

Can you share a bit more of your code? I feel you’re running into a typical go issue around closing over a loop variable

here's an example that would make sense:

func SetupPostgres(ctx *pulumi.Context, args *DataArgs, opts ...pulumi.ResourceOption) error {
  var postgresCfg ConfigPostgres
  config.New(ctx, "data").RequireObject("postgres", &postgresCfg)

  for _, instanceCfg := range postgresCfg.Instances {
    err := setupPostgresInstance(ctx, &instanceCfg, args, opts...)
    if err != nil {
      return err
    }
  }

  return nil
}

func setupPostgresInstance(
  ctx *pulumi.Context, cfg *ConfigPostgresInstance, args *DataArgs, opts ...pulumi.ResourceOption,
) error {
  instance := &PostgresInstance{
    Name:         cfg.Name,
    InstanceName: fmt.Sprintf("postgres-%s", cfg.Name),
  }

  instance.pgaPasswordName = fmt.Sprintf("%s-pga", instance.InstanceName)
  instance.pgaPassword, err = random.NewRandomPassword(ctx, instance.pgaPasswordName, &random.RandomPasswordArgs{
    Length:  <http://pulumi.Int|pulumi.Int>(24),
    Special: pulumi.Bool(false),
  }, opts...)
  if err != nil {
    return err
  }

  pgaConfig := instance.pgaPassword.Result.ApplyT(func(pgaPassword string) string {
    // instance here is the last element, not the current
    return instance.preparePgaConfig(pgaCfg.ApiKey, pgaPassword)
  }).(pulumi.StringOutput)

  return nil
}

I believe so - you’re passing a reference to the loop variable itself, so it will change every time the loop iteration will change. The

ApplyT

callback function will not be invoked until it’s ready, and at that point, you’re referring to the last iteration of the loop most likely

thanks, I'll try to rewrite it to avoid pointers