[Solved] Datasource interpolation in dynamic block

Terraform
1

hi,

I’m trying to do the following :

data "subnet" "foo" {
  name = "sub"
}

locals { 
  network = ["foo"]
}

dynamic "nic_list" {
  for_each = local.network
  content {
    bar = data.subnet.${nic_list.value}.metadata.uuid
  }
}

but i’m getting Error: Invalid attribute name, an attribute name is required after a dot

Thus I tried to surround bar value with quote which seems to work in a sense.
Bar variable effectively get assigned the string litteral data.subnet.foo.metadata.uuid whereas I was expecting that it would be expanded to the real datasource attribute value.

Is this how terraform do interpolation ?

Is there a way to assign dynamiccaly from datasource value ?

2

You can’t refer to another resource using a dynamic label, no. But since the label is also a fixed string, I’m not sure why you’re trying to do this. Why not write data.subnet.foo.metadata.uuid?

Can you explain more about what you’re trying to achieve here?

3

Well how we met again :slight_smile:
Thanks again for your answer.

Indeed I came up with what you suggest. Looking back I think I was trying something kind of overcomplicated.

Anyway thank you very much.