Terraform create variable array from tfvars-CodePudding

I am still getting used to using Terraform and have the following question.

I have an array in a TFVARS file; extproviders = [ "production" , "support" ]

i am using thisto call a module

module userpoolclientN {
   count = length(var.extproviders)
   source =  "../modules/cognito"
   basename = var.extproviders[count.index]
}

what i would like to do is create a new array that attaches 'odd' 'even' to each variable. I dont want the user to input this as the extproviders is used elsewhere in the code.

extproviders_new = [ "production_odd" ,"production_even" , "support_odd", "support_even" ]


module userpoolclientN {
   count = length(var.extproviders_new)
   source =  "../modules/cognito"
   basename = var.extproviders_new[count.index]
}

I am still learning Terraform, understand i cant use a for loop to accomplish this. Is there another way?

CodePudding user response：

Using for and foreach :

variable "extproviders" {
  default = ["production", "support"]
}

locals {
  extproviders_new  = flatten([ for e in var.extproviders : tolist(["${e}odd","${e}even"])])
}


module userpoolclientN {
   for_each = toset(local.extproviders_new)
   source =  "../modules/cognito"
   basename = each.value
}

Explaining the locals :

For each element on the input list returns a list made of that element odd suffix and element even suffix. Then flatten those list into a single one

flatten() will transform multilevel lists into a single one

[for] will returns a list containing two lists

"${e}odd" and "${e}even" is a simple string concatenation