Conditionally define module scope

[cloudyjobin]

I want to define the scope for a module conditionally based on the subscriptionId and rgName parameters. If both subscriptionId and rgName are defined, the scope should be resourceGroup(subscriptionId, rgName). If only rgName is defined, the scope should be resourceGroup(rgName). If neither parameter is defined, use the current scope, which is resourceGroup().

I've tried multiple approaches to make this work, but none have been successful. Can someone help me resolve this issue?

param subscription string = 'xxx-xxx-xxx-xx-x-xx'
param rgname string = 'test-rg'

var derivedScope = empty(subscription) && empty(rgname) ? resourceGroup().name : empty(subscription) ? rgname : (subscription,rgname)

resource vmexists 'Microsoft.ScVmm/virtualMachines@2023-04-01-preview' existing = {
  name: 'test-vm'
  scope: resourceGroup(derivedScope)
}

output resourceId string = vmexists.id

[slavizh]

you mean this:

param subscription string = 'xxx-xxx-xxx-xx-x-xx'
param rgname string = 'test-rg'

resource vmexists 'Microsoft.ScVmm/virtualMachines@2023-04-01-preview' existing = {
  name: 'test-vm'
  scope: empty(subscription) && empty(rgname) ? resourceGroup() : empty(subscription) ? resourceGroup(rgname) : resourceGroup(subscription,rgname)
}

output resourceId string = vmexists.id

[cloudyjobin]

Exactly this is what I am trying to achieve but there is a bug that prevents setting conditions directly on the scope property as discussed in the below issue. This is the reason why I am trying to derive the function parameter as a variable and pass the variable as an argument to the resourceGroup() function.
#7367

[slavizh]

In such case you should log an issue for the actual issue you are seeing.

[levimatheri]

@cloudyjobin this is messy, but does this work for you?

param subscription string = 'xxx-xxx-xxx-xx-x-xx'
param rgname string = 'test-rg'

resource vmexists 'Microsoft.ScVmm/virtualMachines@2023-04-01-preview' existing = if (!empty(subscription) && !empty(rgname)) {
  name: 'test-vm'
  scope: resourceGroup(subscription, rgname)
}

resource vmexists1 'Microsoft.ScVmm/virtualMachines@2023-04-01-preview' existing = {
  name: 'test-vm'
  scope: resourceGroup(empty(subscription) ? rgname : resourceGroup().name)
}

output resourceId string = vmexists.?id ?? vmexists1.id