Output CSV file using terraform - terraform

Question

I'm trying to use terraform variable data (CSV file) to create a resource group and the name of the resource group are added into the CSV file.
I'm currently experiencing the below error.
provider "azurerm" {
features{}
}
locals {
resource_groupname = csvdecode(file("./test.csv"))
}
resource "azurerm_resource_group" "Main" {
count = length(locals.resource_groupname)
name = locals.resource_groupname[count.index].groupname
location = "North europe"
}
Error Message
Error: Reference to undeclared resource
│
│ on testvariable.tf line 10, in resource "azurerm_resource_group" "Customer11":
│ 10: count = length(locals.groupname)
│
│ A managed resource "locals" "groupname" has not been declared in the root module.
╵
╷
│ Error: Reference to undeclared resource
│
│ on testvariable.tf line 11, in resource "azurerm_resource_group" "Customer11":
│ 11: name = data.locals.groupname[count.index].groupname
│
│ A data resource "locals" "groupname" has not been declared in the root module.
╵
Updated Error Messgae
╷
│ Error: Reference to undeclared resource
│
│ on testtf.tf line 10, in resource "azurerm_resource_group" "Main":
│ 10: count = length(locals.resource_groupname)
│
│ A managed resource "locals" "resource_groupname" has not been declared in the root module.
╵
╷
│ Error: Reference to undeclared resource
│
│ on testtf.tf line 11, in resource "azurerm_resource_group" "Main":
│ 11: name = locals.resource_groupname[count.index].groupname
│
│ A managed resource "locals" "resource_groupname" has not been declared in the root module.

Answer 1

Your code should be (assuming this time you posted correct code):
resource "azurerm_resource_group" "Main" {
count = length(local.resource_groupname)
name = local.resource_groupname[count.index].groupname
location = "North europe"
}
Since ./test.csv is not shown its difficult to speculate on its content and the use in your code.

Answer 2

Suppose your CSV file has headers like
name, location, ABC, XXY, CDF, your
then you use for_each as well here
locals {
resource_groupname = csvdecode(file("./test.csv"))
}
resource "azurerm_resource_group" "Main" {
for_each = { for inst in locals.resource_groupname) : inst.location=> inst
}
name = each.value.name
location = each.value.location
}