[ansible-project] Using set_fact along with do until group

[Naween Ghimire]

Hi I have a usecase where i have a string "dumb". During the execution of
play i create a new string by using a random filter and this string should
be any of ['duma','dumc','dumd'] but not "dumb". So i tried to use do until
loop as follows:

- hosts: local
connection: local
gather_facts: false
vars:
old_string: 'dumb'

tasks:
- name: Generate random number
set_fact: "new_string=dum{{ ['a','b','c','d'] |random }}"
register: e
until: e != old_string

- name: Fail if old number and new number are same
action: fail
when: new_string == old_string

So as far as i am concerned the check at the until step should avoid
allowing the new_string to be "dumb", but its not doing as expected. Any
suggestions ?

[Brian Coca]

try:
set_fact: "new_string=dum{{
(['a','b','c','d']|difference([old_string[-1]])) |random }}"

it should not need loop as you remove the old string ending from the
available list