Terraform: Convert list of object to list of single element from object

Question

I have a list of objects from a variable in terraform

variable "persons" {
  type = list(object({
    name = string,
    phonenumber = string,
    tshirtSize = string
  }))
    description = "List of person"
}

Now I want a list of the person's names so I can use it to define an AWS Resource

How can I convert this object list to a list of names ["bob", "amy", "jane"]

I'm on terraform 0.12.24, though can upgrade if needed

user_12314944 · Answer

Updated Answer:
Use the splat expression

var.persons[*].name

https://www.terraform.io/docs/configuration/expressions.html#splat-expressions

Original Answer:
I was able to do this in locals file

locals {
  names = [
    for person in var.persons:
    person.name
  ]
}

For additional reading SEE: https://www.hashicorp.com/blog/hashicorp-terraform-0-12-preview-for-and-for-each/

Terraform: Convert list of object to list of single element from object

1 Answers