I was told that I can do `new StackReference` as many times

Question

I was told that I can do `new StackReference` as many times I need but when I put it in a function and it gets called twice I get `resource urn pulumi app staging ckc test pulumi pulumi StackReference seunggs ckc test app build registered twice read and read ` error and `pulumi up` fails during preview What am I doing wrong

billowy-army-68599 · Answer

it needs to have a unique name can you share your code

most-lighter-95902 · Answer

```const main = async = gt const stack = pulumi getStack const checkStackExists = qualifiedStackName string = gt try const stackRef = new pulumi StackReference qualifiedStackName return true catch err return false const checkAppBuildStackExists = = gt return checkStackExists `$ organization $ project app build` const getAppBuildStackOutputs = = gt const appBuildStackRef = new pulumi StackReference `$ organization $ project app build` const appEcrImageUrl = appBuildStackRef getOutput imageUrl as pulumi Output lt string gt return appEcrImageUrl if stack === app staging || stack === app prod const appEcrImageUrl = checkAppBuildStackExists getAppBuildStackOutputs const AppStack = await import pulumi stacks app const appStackOutput = new AppStack app stack imageUrl appEcrImageUrl provider k8sProvider return appStackOutput export = main```

most-lighter-95902 · Answer

This is roughly the code not sure what you mean by unique name I thought you get stack reference by stack s fully qualified name which is unique of course i e no two stacks with the same name

most-lighter-95902 · Answer

< billowy army 68599>

most-lighter-95902 · Answer

Thanks for looking into this BTW

most-lighter-95902 · Answer

< billowy army 68599> still blocked by this any idea why this is happening

billowy-army-68599 · Answer

sory I m at re invent this week so slow to respond It s working by design you ll need to modify your code to only populate the stack ref once

most-lighter-95902 · Answer

Oh right re invent No worries So you CANNOT do `new StackReference` multiple times then

most-lighter-95902 · Answer

So if this is the case any way to check if the stack exists The problem is I cannot call `new StackReference` freely because it errors out if the stack doesn t exist

ambitious-father-68746 · Answer

You can do multiple StackReferences if you specify a unique identifier as a separate parameter StackReference acts as a resource so you can t declare it twice

ambitious-father-68746 · Answer

Here s an example in Python ```stack = pulumi StackReference unique id 1 stack name= blabla same stack again = pulumi StackReference unique id 2 stack name= blabla ```

ambitious-father-68746 · Answer

So I m referencing the stack `blabla` twice The other way of doing it is changing your code so that you only need to reference it once but this give you options