Terrraform list of objects syntax - amazon-web-services

Question

I'm using a module that references a central module used to build a Puppet server in terraform. There is one variable in the root module that allows additional tags to be used with the ASG however I can't seem to get the syntax right. This is the information in the core repository:
variable "additional_asg_tags" {
description = "A map of additional tags to add to the puppet server ASG."
type = list(object({ key = string, value = string, propagate_at_launch = bool }))
default = []
}
I've tried everything I can think of to call this but it always errors with messages like "incorrect list element type: string required." or "This default value is not compatible with the variable's type constraint: list of object required."
I'm trying to call the above with something like;
variable "additional_asg_tags" {
description = "A map of additional tags to add to ASG."
type = list(object({ key = string, value = string, propagate_at_launch = bool }))
default = { key = "Name", value = "Puppet-nonprod", propagate_at_launch = "true"
}
}
I've removed the square braces around this as that was causing errors also but I may need to add these back in.
Can someone help please in what is the correct way to reference a list of objects with these values

Answer 1

The correct default value for your additional_asg_tags is a list:
variable "additional_asg_tags" {
description = "A map of additional tags to add to ASG."
type = list(object({
key = string,
value = string,
propagate_at_launch = bool
}))
default = [{
key = "Name",
value = "Puppet-nonprod",
propagate_at_launch = "true"
}]
}
You can reference individual elements as follows (some examples):
var.additional_asg_tags[0]["key"]
var.additional_asg_tags[0].value
# to get list
var.additional_asg_tags[*].propagate_at_launch