Data source "region instance group" attribute size cannot be referenced by a count for iterative route creation in Google Cloud.

[Red--]

Per this terraform page (https://www.terraform.io/docs/providers/google/d/datasource_compute_region_instance_group.html), I should be able to reference the size attribute to get the number of running instances from the regional instance group data source.

Example

resource "google_compute_route" "backbone_network_to_prod_supernet" {
count = "${data.google_compute_region_instance_group.[group_name].size}"
.... more settings ...
}

This results in an error:

• module.[project-name].google_compute_route.backbone_network_to_prod_supernet: google_compute_route.backbone_network_to_prod_supernet: value of 'count' cannot be computed

I have tried iterating over the length of the list of instances, referencing the size, and other methods, to no avail.

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Terraform Version

Affected Resource(s)

• google_XXXXX

Terraform Configuration Files

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Debug Output

Panic Output

Expected Behavior

Actual Behavior

Steps to Reproduce

1. terraform apply

Important Factoids

References

• #0000

[Red--]

NOTE: I can call the region instance group in the Google API Explorer and it returns the "size" count of the same group I am trying to reference within my terraform script. This tells me that it does exist, there is just an issue with how Terraform is pulling the information from Google's APIs.

[rileykarson]

Unfortunately, there's nothing we can do in the provider to fix this. Duplicates hashicorp/terraform#12570.

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. If you feel I made an error 🤖 🙉 , please reach out to my human friends 👉 hashibot-feedback@hashicorp.com. Thanks!