redis_ingress: value of 'count' cannot be computed

[BigAl]

Error running plan: 1 error(s) occurred:

* module.redis.aws_security_group_rule.redis_ingress: aws_security_group_rule.redis_ingress: value of 'count' cannot be computed

While attempting to use the option allowed_security_groups

  source         = "github.com/terraform-community-modules/tf_aws_elasticache_redis?ref=1.0.1"
  env            = "${var.env}"
  name           = "${var.project}"
  redis_clusters = "2"
  redis_failover = "true"
  subnets        = "${var.data_subnet_list}"
  vpc_id         = "${var.vpc_id}"
  allowed_security_groups = ["${aws_security_group.instance.id}"]
}

I understand the issue here as the instance security group has not yet been created it can't be counted. Seems to be understood see hashicorp/terraform#10857

This only failed for me when i destroyed and attempted to rebuild my stack from scratch. Previous as my instance already had been built it was not an issue.

I'm unsure of what exactly the solution to this is.

[davidkarban]

Got stuck with that too, as I understand from hashicorp/terraform#10857 there is actually only workarounds possible, I prefer the one with count value, because at least I`m not forced to populate subnets with fixed segurity group ids.

[kitsuneninetails]

Is this just not going to get fixed? It's been a year and a half... I will have to opt to not use the redis module at all, as this bug is a blocker.