Terraform Resource attribute not being removed when passing in empty values - google-cloud-platform

Question

I am working with a GCP Cloud Composer resource and added in a dynamic block to create an attribute for the resource to set allowed_ip_ranges which can be used as an IP filter for accessing the Apache Airflow Web UI.
I was able to get the allowed ranges setup and can update them in place to new values also.
If I attempt to pass in a blank list I am expecting the IP address(es) to be removed as attributes for the resource but Terraform seems to think that no changes are needed.
There is probably something wrong in my code but I am not sure what exactly I would need to do. Does it involve adding in a conditional expression to the for_each loop in the dynamic block?
Child module main.tf
web_server_network_access_control {
dynamic "allowed_ip_range" {
for_each = var.allowed_ip_range
content {
value = allowed_ip_range.value["value"]
description = allowed_ip_range.value["description"]
}
}
}
Child module variables.tf
variable "allowed_ip_range" {
description = "The IP ranges which are allowed to access the Apache Airflow Web Server UI."
type = list(map(string))
default = []
}
Parent module terraform.tfvars
allowed_ip_range = [
{
value = "11.0.0.2/32"
description = "Test dynamic block 1"
},
]

Answer 1

You can set the default value in your variables.tf file:
variable "allowed_ip_range" {
description = "The IP ranges which are allowed to access the Apache Airflow Web Server UI"
type = list(map(string))
default = [
{
value = "0.0.0.0/0"
description = "Allows access from all IPv4 addresses (default value)"
},
{
value = "::0/0"
description = "Allows access from all IPv6 addresses (default value)"
},
]
}
And when you will delete your variable from terraform.tfvars, you will have the default values