Terraform dynamically create a tuple

Question

Here is the challenge:

I have an iterated for-each loop to create a bunch of elements in a list:

test_count = 90
test_items = [for i in range(local.test_count) : format("test%02s", i+1)]

What I need to do is to dynimcally create a local tuple that looks like the below:

custom_items = {
    test01 = {
      name      = concat("test01", "shared value")
    }
    test02 = {
      name      = concat("test02", "shared value")
    }
  }

This is because the test01 component is used as a key later on for calling dynamically created modules.

However, I am not sure if or how one can dynamically create a list.

Obviously there will be a for_each loop or a for i in etc. in it, but I am not sure how to create the list, to be able to reference it later on.

FWIW, the example value you included in your second code block is an object, rather than a tuple. It seems like you got the answer you needed anyway, but hopefully learning the correct terminology is useful for researching similar questions in future! 😀 — Martin Atkins
– Martin Atkins, Commented Mar 21 at 21:22

Paolo · Accepted Answer · 2025-03-20 08:59:32Z

2

Iterate over test_items to create the desired object:

locals {
  test_count = 90
  test_items = [for i in range(local.test_count) : format("test%02s", i + 1)]
  custom_items = {
    for item in local.test_items :
    item => {
      name = format("%s%s", item, "shared value")
    }
  }
}

> local.custom_items
{
  "test01" = {
    "name" = "test01shared value"
  }
  "test02" = {
    "name" = "test02shared value"
  }
  "test03" = {
    "name" = "test03shared value"
  }
  "test04" = {
    "name" = "test04shared value"
  }
  ...
}

answered Mar 20 at 8:59

Paolo

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