Terraform 0.12 - Produce map/object from nested for loop
A partial answer can be found at https://github.com/hashicorp/terraform/issues/22263. Long story short: this was a foolish attempt to begin with, a map cannot contain duplicate keys.
I am however still interested in understanding how a map of maps could be produced from a nested for loop. See second code example above, producing a list of maps.
EDIT: a full answer was given on the github issue linked above.
"This is (obviously) a useless structure, but I wanted to illustrate that it is possible:
locals {
association-list = {
for policy, users in var.iam-policy-users-map:
policy => { // can't have the nested for expression before the key!
for u in users:
policy => u...
}
}
}
Outputs:
association-list = {
"policy1" = {
"policy1" = [
"user1",
]
}
"policy2" = {
"policy2" = [
"user1",
"user2",
]
}
}
"