Terraform loop over list of objects in dynamic block issue - google-cloud-platform

Question

I am trying to create a storage bucket in GCP using Terraform. Please see the below implementation and the .tfvars snippet foe the same
implementation logic
`
resource "google_storage_bucket" "cloud_storage" {
for_each = {for gcs in var.storage_buckets : gcs.name => gcs}
name = each.value.name
location = lookup(each.value, "location", "AUSTRALIA-SOUTHEAST1")
project = data.google_project.existing_projects[each.value.project].project_id
force_destroy = lookup(each.value, "force_destroy", false)
storage_class = lookup(each.value, "storage_class", "STANDARD")
labels = merge(
lookup(each.value, "labels", {}),
{
managed_by = "terraform"
}
)
dynamic "versioning" {
for_each = [for version in [lookup(each.value, "versioning", null)] : version if version != null]
content {
enabled = lookup(versioning.value, "enabled", true)
}
}
dynamic "lifecycle_rule" {
for_each = [for rule in [lookup(each.value, "lifecycle_rule", toset([]))] : rule if length(rule) != 0]
content {
action {
type = lifecycle_rule.value.action.type
storage_class = lookup(lifecycle_rule.value.action, "storage_class", null)
}
condition {
# matches_suffix = lookup(lifecycle_rule.value["condition"], "matches_suffix", null)
age = lookup(lifecycle_rule.value.condition, "age", null)
}
}
}
uniform_bucket_level_access = lookup(each.value, "uniform_bucket_level_access", false)
depends_on = [
data.google_project.existing_projects
]
}
.tfvars snippet
storage_buckets = [
# this 1st bucket is only defined in DEV tf vars. reason: this bucket is a onetime creation for all DWH cloud artifacts under ecx-cicd-tools project.
{
name = "ecx-dwh-artefacts"
localtion = "AUSTRALIA-SOUTHEAST1"
force_destroy = false
project = "ecx-cicd-tools"
storage_class = "STANDARD"
versioning = {
enabled = false
}
labels = {
app = "alation"
project = "resetx"
team = "dwh"
}
uniform_bucket_level_access = false
folders = ["alation/","alation/packages/","alation/packages/archive/",
"alation/backups/","alation/backups/data/","alation/backups/data/DEV/","alation/backups/data/PROD/"]
lifecycle_rule = [
{
action = {
type = "Delete"
}
condition = {
age = "10"
}
},
]
}
,
{
name = "eclipx-dwh-dev"
localtion = "AUSTRALIA-SOUTHEAST1"
force_destroy = false
project = "eclipx-dwh-dev"
storage_class = "STANDARD"
versioning = {}
labels = {
app = "dataflow"
project = "resetx"
team = "dwh"
}
uniform_bucket_level_access = false
folders = ["Data/","Data/stagingCustomDataFlow/","Data/temp/","Data/templatesCustomDataFlow/"]
lifecycle_rule = []
}
]
`
Some have I am unable to make the dynamic block working in the bucket provision logic for the lifecycle_rule section, I am passing a list of objects from .tfvars as I need to be able to add many rules to the same bucket.
It looks like the foreach loop is not iterating over the list of objects in the lifecycle_rule of .tfvars
Below are the errors its throwing. Can someone please assist.
Error: Unsupported attribute
│
│ on storage.tf line 56, in resource "google_storage_bucket" "cloud_storage":
│ 56: type = lifecycle_rule.value.action.type
│ ├────────────────
│ │ lifecycle_rule.value is list of object with 1 element
│
│ Can't access attributes on a list of objects. Did you mean to access attribute "action" for a specific element of the list, or across all elements of the list?
╵
╷
│ Error: Unsupported attribute
│
│ on storage.tf line 57, in resource "google_storage_bucket" "cloud_storage":
│ 57: storage_class = lookup(lifecycle_rule.value.action, "storage_class", null)
│ ├────────────────
│ │ lifecycle_rule.value is list of object with 1 element
│
│ Can't access attributes on a list of objects. Did you mean to access attribute "action" for a specific element of the list, or across all elements of the list?
╵
╷
│ Error: Unsupported attribute
│
│ on storage.tf line 61, in resource "google_storage_bucket" "cloud_storage":
│ 61: age = lookup(lifecycle_rule.value.condition, "age", null)
│ ├────────────────
│ │ lifecycle_rule.value is list of object with 1 element
│
│ Can't access attributes on a list of objects. Did you mean to access attribute "condition" for a specific element of the list, or across all elements of the list?
Thank you.
I am expecting it that the dynamic block loop over lifecycle_rule

Answer 1

Your for_each is incorrect. It should be:
dynamic "lifecycle_rule" {
for_each = length(each.value["lifecycle_rule"]) != 0 ? each.value["lifecycle_rule"] : []
content {
action {
type = lifecycle_rule.value.action.type
storage_class = lookup(lifecycle_rule.value.action, "storage_class", null)
}
condition {
# matches_suffix = lookup(lifecycle_rule.value["condition"], "matches_suffix", null)
age = lookup(lifecycle_rule.value.condition, "age", null)
}
}