CODEWITHSUNDEEP
amazon-web-servicesmoduleiteratorterraform
Lance Pollard
Lance Pollard

Reputation: 79468

How to use for_each with iterator in dynamic block in Terraform?

I am trying to do this basically:

module "california" {
  source = "./themodule"
  # ...
}

module "oregon" {
  source = "./themodule"
  # ...
}

resource "aws_globalaccelerator_endpoint_group" "world" {
  # ...
  dynamic "endpoint_configuration" {
    for_each = [
      module.california.lb,
      module.oregon.lb
    ]
    iterator = lb
    content {
      endpoint_id = lb.arn
      weight = 100
    }
  }
}

# themodule/main.tf
resource "aws_lb" "lb" {
  # ...
}

output "lb" {
  value = aws_lb.lb
}

I am outputting lb from a submodule in Terraform, and trying to use that in the parent module in a for_each array, with a custom iterator name. It is giving me this error:

This object does not have an attribute named "arn".

But it DOES have that attribute, it's an aws_lb. What am I doing wrong in the usage of this for_each and module setup, and how do I fix it? Thank you very much!

If I change it to this it seems to work:

resource "aws_globalaccelerator_endpoint_group" "world" {
  listener_arn = aws_globalaccelerator_listener.world.id

  endpoint_configuration {
    endpoint_id = module.california.lb.arn
    weight = 100
  }
}

Upvotes: 3

Views: 6642

Answers (1)

Marcin
Marcin

Reputation: 238867

From the docs:

The iterator object (setting in the example above) has two attributes:

key is the map key or list element index for the current element. If the for_each expression produces a set value then key is identical to value and should not be used.

value is the value of the current element.

Based on that, in the content, you should used lb.value["arn"], as per example. Thus, the following could be tried:

    content {
      endpoint_id = lb.value["arn"]
      weight = 100
    }

Upvotes: 4

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