How. to iterate list(map(list)) in terraform - list

Question

I want to create files(key) in s3. By below code, I can successfully create the files in s3 -
locals {
rules = [
{
user = "user-1",
roles = "test"
}
}
resource "aws_s3_bucket_object" "this" {
for_each = zipmap(local.rules.*.user, local.rules.*)
bucket = "test-09129"
acl = "private"
source = "/dev/null"
key = "${each.value.roles}/${each.key}"
}
file in s3 - test/user-1 created
But roles can be multiple so I create list for roles.
locals {
rules = [
{
user = "user-1",
roles = ["test"]
},
{
user = "user-2",
roles = ["test", "dev", "prd"]
}]
}
Now I want to create files based on above list. How to iterate list(roles) to create files based on user and role?
desire output -
file in s3 -
test/user-1
test/user-2
dev/user-2
prd/user-2

Answer 1

You can flatten your rules into helper_rules (assuming I understand correctly your desired outcome):
locals {
rules = [
{
user = "user-1",
roles = ["test"]
},
{
user = "user-2",
roles = ["test", "dev", "prd"]
}]
helper_rules = merge([
for user, rules in zipmap(local.rules.*.user, local.rules.*.roles):
{ for rule in rules:
"${user}-${rule}" => {user = user, rule = rule}
}
]...)
}
This will result in helper_rules:
{
"user-1-test" = {
"rule" = "test"
"user" = "user-1"
}
"user-2-dev" = {
"rule" = "dev"
"user" = "user-2"
}
"user-2-prd" = {
"rule" = "prd"
"user" = "user-2"
}
"user-2-test" = {
"rule" = "test"
"user" = "user-2"
}
}
With that, your objects could be:
resource "aws_s3_bucket_object" "this" {
for_each = local.helper_rules
bucket = "test-09129"
acl = "private"
source = "/dev/null"
key = "${each.value.role}/${each.value.user}"
}