Terraform conditional block inside a map

[chanisef]

I have an https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/lambda_function resource like below:

resource "aws_lambda_function" "mylambda" {
#...

environment {
    variables = {
        FOO = 1
    }
}

}

I'm tring to add some environment variables dynamically based on my var.enable_vars

variable "enable_vars" {
  type        = bool
  default     = false
}
resource "aws_lambda_function" "mylambda" {
#...

environment {
    variables = {
        FOO = 1
#### if var.enable_vars == true
#       BAR = 2
#       BAZ = 3
    }
}

}

How to achieve that? Is not clear to me if a dynamic block can be used there.

[Duquan]

This could be done with a dynamic block but its pretty complicated. This is how I would do it but there are other ways.

variable "enable_vars" {
  type        = bool
  default     = false
}
locals {

default_lambda_vars = {

FOO = 1

}

extra_vars = {

BAR = 2

BAZ = 3

}
final_lambda_vars = var.enable_vars ? merge(local.default_lambda_vars, local.extra_vars) : local.default_lambda_vars

}
resource "aws_lambda_function" "mylambda" {
#...

environment {
    variables = local.final_lambda_vars
}

}