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# general
h
high-holiday-63390
11/07/2021, 10:28 PM Copy code
const privateSubnets = await vpc.getSubnets('private')
const result = privateSubnets.map(net => net.id).join(",")l
little-cartoon-10569
11/07/2021, 10:42 PMYou cannot get a string from an output. An output isn't a value until "later".
However there is always a way to use the strings that become available later. What is your aim? Can you share a larger chunk of code?
h
high-holiday-63390
11/07/2021, 10:43 PMI need to pass a comma-separated list of subnets as a string argument to another resource
I also tried this but got null values
Copy code
{
name: "Subnets",
namespace: "aws:ec2:vpc",
value: pulumi.interpolate(`${privateSubnets[0].id},${privateSubnets[1].id}`)
},This is being assigned to an object
Which gets passed to
new aws.elasticbeanstalk.Environmentl
little-cartoon-10569
11/07/2021, 10:45 PMIf the other resource accepts an Input, then it will work. If it accepts only a string, then you'll have to create the other resource inside an
apply()h
high-holiday-63390
11/07/2021, 10:46 PMI’m not sure how to tell if the other resource accepts an input. But, this does work by just lifting one value like
privateSubnets[0].idl
little-cartoon-10569
11/07/2021, 10:50 PMI've checked the source. That's a bug, there's a lot of values in there that should accept inputs.
h
high-holiday-63390
11/07/2021, 10:50 PMthe abolve code does not throw an error, but I don’t see the values in the diff
l
little-cartoon-10569
11/07/2021, 10:51 PMIn the short term, you need to do a lot of that work inside an
apply()The code you have right now will have an error message as the value, that message about "you need to use apply or interpolate".
h
high-holiday-63390
11/07/2021, 10:52 PModdly this is what the diff looks like
Copy code
name : "Subnets"
namespace : "aws:ec2:vpc"
value : "."OK - where would this apply need to go exactly?
l
little-cartoon-10569
11/07/2021, 10:53 PMThe block of code from line 17 to 154 would need to be inside the apply()
h
high-holiday-63390
11/07/2021, 10:53 PMWhat would the apply look like though?
l
little-cartoon-10569
11/07/2021, 10:54 PMAnd you'll need to use something like this:
Copy code
pulumi.all([privateSubnets[0].id, privateSubnets[1].id).apply(([id0, id1]) => { your code });h
high-holiday-63390
11/07/2021, 10:55 PMah, ok
l
little-cartoon-10569
11/07/2021, 10:55 PMThen id0 and id1 would be the correct string value you need to use. You can remove "interpolate" from the contained code, you have real strings at that point.
h
high-holiday-63390
11/07/2021, 10:55 PMso is there an actual bug here?
l
little-cartoon-10569
11/07/2021, 10:55 PMCan you also raise an issue about this? There's probably no reason to have the code this way: it should be possible to use
privateSubnets[0].idh
high-holiday-63390
11/07/2021, 10:56 PMIt does actually work as a value
l
little-cartoon-10569
11/07/2021, 10:56 PMYes, but it's the wrong value 🙂
h
high-holiday-63390
11/07/2021, 10:57 PMIs the bug that it works on its own, but not with interpolation?
Also, if it were working, would it show up in the diff as something other than
.l
little-cartoon-10569
11/07/2021, 10:57 PMNo. It's not properly working even without interpolate. You're passing in an output, which typescript converts to a string. But that string is an error message, not the correct value.
Can you look at the environment settings in the AWS console? You'll see the error message.
h
high-holiday-63390
11/07/2021, 10:58 PMInvalid option value: '.'l
little-cartoon-10569
11/07/2021, 10:59 PMHeh, I've just re-checked your code and I found another bug 🙂
You have this:
Copy code
pulumi.interpolate(`${privateSubnets[0].id},${privateSubnets[1].id}`) Copy code
pulumi.interpolate`${privateSubnets[0].id},${privateSubnets[1].id}`h
high-holiday-63390
11/07/2021, 11:02 PMah, nice
how does that get interpreted exactly?
Appears to be working 👍
👍 1
l
little-cartoon-10569
11/07/2021, 11:18 PMSorry, was on a call. Essentially,
pulumi.interpolate