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# general

sparse-intern-71089

10/14/2020, 5:08 PM

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✅ 1

elegant-island-39916

10/14/2020, 5:16 PM

To provide more context, the

pulumi.Output[List]

is a list of availability zones that were used in the creation of my AWS VPC in a different stack. They are being iterated over to create a

rds.ClusterInstance

for each availability zone

billowy-army-68599

10/14/2020, 5:20 PM

which language SDK are you using?

elegant-island-39916

10/14/2020, 5:22 PM

Python

elegant-island-39916

10/15/2020, 8:56 AM

Bumping this to see if anyone has a solution, I'm sure there's something trivial I'm missing. I've been unable to iterate through the output of another stack to create resources.

✅ 1

green-school-95910

10/15/2020, 1:16 PM

The reason for suggesting against creating resources inside

Output#apply

is that it causes incomplete graphs in some scenarios, like during the preview phase of the first deployment of that resource. But it is not forbidden. For your case I don't see any other option.

elegant-island-39916

10/15/2020, 1:22 PM

@green-school-95910 It didn't even create resources inside the apply function, I've got a nasty nasty hacky way of getting the availability zones now though:

Copy code

subprocess.run(["pulumi", "stack", "select", pulumi_config.require("network-stack")])
availability_zones = json.loads(subprocess.check_output(["pulumi", "stack", "output", "availability-zones"]).decode("utf-8"))

Surely this cannot be the only way of achieving this?

green-school-95910

10/15/2020, 1:23 PM

Have you tried just putting it inside apply?

elegant-island-39916

10/15/2020, 1:24 PM

I have, the resources I defined are not created

elegant-island-39916

10/15/2020, 1:25 PM

It looks something like this:

Copy code

def create_rds_cluster_instance(az_name):
    rds.ClusterInstance( ... )


network_stack = StackReference(pulumi_config.require("network-stack"))
availability_zones = network_stack.require_output("availability-zones")
availability_zones.apply(lambda zones: map(create_rds_cluster_instance, zones))

elegant-island-39916

10/15/2020, 1:38 PM

I've figured what's wrong, the actual creation should look something like this instead:

Copy code

def create_rds_cluster_instance(az_name):
    rds.ClusterInstance( ... )

network_stack = StackReference(pulumi_config.require("network-stack"))
availability_zones = network_stack.require_output("availability-zones")
availability_zones.apply(lambda zones: [create_rds_cluster_instance(z) for z in zones])

It's all working now. Cheers @green-school-95910!

elegant-island-39916

10/15/2020, 1:41 PM

Apologies for the brainfart, did not take into account

map

not evaluating all entries in the list

green-school-95910

10/15/2020, 1:51 PM

Yeah,

map

evaluates lazily as a generator.

👍 1

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