Add an item to a list dependent on a conditional in ansible

Question

I would like to add an item to a list in ansible dependent on some condition being met.

This doesn\'t work:

  some_dictionary:
    app:
       - some         


        

Answer 1

I'd try to avoid this, but if conditional list is absolutely necessary, you can use this trick:

---
- hosts: localhost
  gather_facts: no
  vars:
    a: 1
    b: 1
    c: 2
    some_dictionary:
      app: "{{ '[\"something\", \"something else\"' + (a + b == c) | ternary(', \"something conditional\"',' ') + ']' }}"
  tasks:
    - debug: var=some_dictionary.app

It will form an array-like string (["item1","item2","item3"]) and ansible variable templator will convert it into list before assigning to app.