ansible - example of selecting from list of dicts

00_play.yml

---
- hosts: localhost
  gather_facts: false
  connection: local
  vars:
    nvidia_cards_and_drivers:
      # Comment the following list item to see the difference
      - model: "Quadro FX 5800"
        driver_version: "340xx"
      - model: "Quadro 4000"
        driver_version: "390xx"
  tasks:
    - name: select driver version for model
      set_fact:
        driver_ver: "{{ nvidia_cards_and_drivers|selectattr('model', 'equalto', 'Quadro FX 5800')|map(attribute='driver_version')|list }}"

    - name: do something with it
      debug:
        msg: "{{ driver_ver if driver_ver else 'needs latest drv' }}"

01_output

# With list item commented

PLAY [localhost] *************************************************************************************************************************************************************************************************************************************************************************************************************

TASK [select driver version for model] ***************************************************************************************************************************************************************************************************************************************************************************************
ok: [localhost]

TASK [do something with it] **************************************************************************************************************************************************************************************************************************************************************************************************
ok: [localhost] => {
    "msg": [
        "340xx"
    ]
}

PLAY RECAP *******************************************************************************************************************************************************************************************************************************************************************************************************************
localhost                  : ok=2    changed=0    unreachable=0    failed=0

02_output

# With list item uncommented

PLAY [localhost] *************************************************************************************************************************************************************************************************************************************************************************************************************

TASK [select driver version for model] ***************************************************************************************************************************************************************************************************************************************************************************************
ok: [localhost]

TASK [do something with it] **************************************************************************************************************************************************************************************************************************************************************************************************
ok: [localhost] => {
    "msg": "needs latest drv"
}

PLAY RECAP *******************************************************************************************************************************************************************************************************************************************************************************************************************
localhost                  : ok=2    changed=0    unreachable=0    failed=0