CODEWITHSUNDEEP
amazon-web-servicesterraformterraform-provider-aws
Roma
Roma

Reputation: 663

What is needed to make Terraform tolist() to work for my code after the replacement of list()

This is a simple question and I am trying to understand what documentation I can use to better understand this but this is what is happening. I'm looking to update my code of Terraform and I am running into an issue when it comes to using tolist(). My snippet of code:

subnet_ids = var.zone_awareness_enabled ? var.subnet_ids : tolist(var.subnet_ids[0])

When running my terraform plan, I get this error:

|     subnet_ids = var.zone_awareness_enabled ? var.subnet_ids : tolist(var.subnet_ids[0])
│     ├────────────────
│     │ var.subnet_ids[0] is "subnet-234324df3dfd"
│
│ Invalid value for "v" parameter: cannot convert string to list of any single type.

When using list(), I had no problems but this is confusing since it is giving me the correct subnet but it's unable to process the request. Would appreciate any help.

Upvotes: 1

Views: 1866

Answers (1)

Marko E
Marko E

Reputation: 18103

Depending on the requirements it could only be a simple change to the code to look like the following:

subnet_ids = var.zone_awareness_enabled ? var.subnet_ids : [ var.subnet_ids[0] ]

On the other hand, if you take a look at the tolist documentation, it says the following:

Pass a set value to tolist to convert it to a list. Since set elements are not ordered, the resulting list will have an undefined order that will be consistent within a particular run of Terraform

So it is meant to convert a set (with no indices) to a list but it cannot convert a string to a list.

Upvotes: 2

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