Variable within variable

[Spiro Mitsialis]

I have the following and there may be several vlans per switch.  

    "cisco_ios.vlans": {

        "35": {

            "id": "35",

            "mtu": "1500",

            "name": "CC_internal_subnet_35",

            "ports": [

                "GigabitEthernet1/0/1",

                "GigabitEthernet1/0/2",

                "GigabitEthernet1/0/20"

            ],

            "status": "active"

        },

        "499": {

            "id": "499",

            "mtu": "1500",

            "name": "Lync_VoIP_Burnside1",

            "ports": [

                ""

            ],

            "status": "active"

        }

    }

I want to be able to reference the data in here.  Example, I am looking to loop through al *.ports.  I'm trying to do the following which does not work

 vars:

   old_vlan: 35

   new_vlan: 45

  - name: Change vlan old_vlan to new_vlan for all ports in list

    debug:

      msg: "Old VLAN is {{ old_vlan }} and port {{ item }} needs to be changed"

    loop: '{{ cisco_ios.vlans["{{ old_vlan }}"].ports }}'

The following work:      loop: '{{ cisco_ios.vlans["35"].ports }}'

but how do I substitute 35 with the variable old_vlan which contains 35? 

[Kai Stian Olstad]

On 05.08.2019 18:53, Spiro Mitsialis wrote:
> I have the following and there may be several vlans per switch.
> "cisco_ios.vlans": {
> "35": {
> "id": "35",
> "mtu": "1500",
> "name": "CC_internal_subnet_35",
> "ports": [
> "GigabitEthernet1/0/1",
> "GigabitEthernet1/0/2",
> "GigabitEthernet1/0/20"
> ],
> "status": "active"
> },
> "499": {
> "id": "499",
> "mtu": "1500",
> "name": "Lync_VoIP_Burnside1",
> "ports": [
> ""
> ],
> "status": "active"
> }
> }

Your vlans are string because of the quotes around 35 and 499.

> I want to be able to reference the data in here. Example, I am looking to
> loop through al *.ports. I'm trying to do the following which does not work
>
> vars:
> old_vlan: 35
> new_vlan: 45

You are here making variables with int.

> - name: Change vlan old_vlan to new_vlan for all ports in list
> debug:
> msg: "Old VLAN is {{ old_vlan }} and port {{ item }} needs to be
> changed"
> loop: '{{ cisco_ios.vlans["{{ old_vlan }}"].ports }}'

You can't have nested {{ }}, if you are in template mode you are in template mode so just loose the inner {{ }}.
But since your data is a string and you variable is a int you would need to filter you int's to a string

loop: '{{ cisco_ios.vlans[old_vlan | string].ports }}'

Or change old_vlan to a strings and do

loop: '{{ cisco_ios.vlans[old_vlan].ports }}'


--
Kai Stian Olstad