Need help with BICEP array return from a module output

[vbeer008]

Hi BICEP Community,

I got an array output from calling a subnet module.

-- subnet module --

resource vnet 'Microsoft.Network/virtualNetworks@2021-02-01' existing = [for vname in nets: {
  name: '${vname.name}-${substring(uniqueString(resourceGroup().id), 0, 6)}'
  // scope: resourceGroup(vnetRGName)
}]

output subnet array = [for (subnet, i) in nets: {
  subnetId: map(vnet[i].properties.subnets, subid => subid.id)
}]

--
In my main. Bicep, I could see the array output from the module as below:

  subnet                 Array                      
[
	{ 'subnetId': [ '/subscriptions/12345678-2c19-4567-1212-12345678/resourceGroups/bc-rg/providers/Microsoft.Network/virtualNetworks/vnet01-pa3vd/subnets/vnet01-snet01-pa3vd',
	                '/subscriptions/12345678-2c19-4567-1212-12345678/resourceGroups/bc-rg/providers/Microsoft.Network/virtualNetworks/vnet01-pa3vd/subnets/vnet01-snet02-pa3vd'
	              ]
	},
  	{ 'subnetId': [ '/subscriptions/12345678-2c19-4567-1212-12345678/resourceGroups/bc-rg/providers/Microsoft.Network/virtualNetworks/vnet02-pa3vd/subnets/vnet02-snet01-pa3vd'
                        '/subscriptions/12345678-2c19-4567-1212-12345678/resourceGroups/bc-rg/providers/Microsoft.Network/virtualNetworks/vnet02-pa3vd/subnets/vnet02-snet02-pa3vd'
                      ]
        }
]

Is there any method I can convert this subnet into a single array before passing it to another module for whitelisting a network ACL in keyvault?

Expected: Array as

    subnetId: [
      '/subscriptions/12345678-2c19-4567-1212-12345678/resourceGroups/bc-rg/providers/Microsoft.Network/virtualNetworks/vnet01-pa3vd/subnets/vnet01-snet01-pa3vd'
      '/subscriptions/12345678-2c19-4567-1212-12345678/resourceGroups/bc-rg/providers/Microsoft.Network/virtualNetworks/vnet01-pa3vd/subnets/vnet01-snet02-pa3vd'
      '/subscriptions/12345678-2c19-4567-1212-12345678/resourceGroups/bc-rg/providers/Microsoft.Network/virtualNetworks/vnet02-pa3vd/subnets/vnet02-snet01-pa3vd'
      '/subscriptions/12345678-2c19-4567-1212-12345678/resourceGroups/bc-rg/providers/Microsoft.Network/virtualNetworks/vnet02-pa3vd/subnets/vnet02-snet02-pa3vd'
    ]

[brwilkinson]

please share the code you have in main.

[vbeer008]

var nets = [
  {
    name: 'vnet01-pa3vd'
    subnets: [
      {
        name: 'vnet01-snet01-pa3vd'
      }
      {
        name: 'vnet01-snet02-pa3vd'
      }
    ]
  }
  {
    name: 'vnet02-pa3vd'
    subnets: [
      {
        name: 'vnet02-snet01-pa3vd'
      }
      {
        name: 'vnet02-snet02-pa3vd'
      }
    ]
  }
]

resource vnet 'Microsoft.Network/virtualNetworks@2021-02-01' existing = [for vname in nets: {
  name: '${vname.name}-${substring(uniqueString(resourceGroup().id), 0, 6)}'
}]

output subnet array = [for (subnet, i) in nets: {
  subnetId: map(vnet[i].properties.subnets, subid => subid.id)
}]

[brwilkinson]

@vbeer008

Take a look here:

• Flatten object with child array #10660

I don't think that is an exact fit for your question, however let me know I will take another look once I get a chance.

[vbeer008]

@brwilkinson Flatten doesn't work for my case.. :(

[jeskew]

You can use flatten combined with map. Assuming the module is named mod, this would look like: flatten(map(mod.outputs.subnet, s => s.subnetId))

[vbeer008]

@jeskew, map used inside the module and flatten(map()) again in main bicep work! Thanks a lot guys. :)

[vbeer008]

@brwilkinson
I used your example you shared previously "#4953"

For my case, I have multiple VNETs and SubNets as you see the defined variable. would like to use the same technique to construct a new single array with all 4 SubnetId