How to conditionally create resource in CDK for terraform?

Terraform CDK for Terraform
1

I see examples of creating resources conditionally in terraform as:

count = var.day != "Sunday" ? 1 : 0

How does one achieve this in CDK for TF? I don’t see the ternary as an Fn operator. I am generating a TF module from my CDK so I need this encoded in the output.

2

This is not supported in 0.15 (we will ship support for count in 0.16, but the ternary is still missing), but you can use an override.

myConditionalResource.addOverride("count", `\${${myDayVar.stringValue} != "Sunday" ? 1 : 0}`)

We are basically writing your TF expression into the count field directly (therefore we need to wrap it in ${} to indicate its a TF expression. We can use your variable with the stringValue accessor to do the var.day portion, this way it will change if you change the variable name.

3

Why don’t you use a simply if statement?

if enable_resource:
  MyResource(...)