Test value of all members in hash variable in Ansible playbook - ansible

Question

I need to run a task only if one or more files from a pre-defined list of files are missing. I tried the following (and some variants):
touch a
cat test.yml
- hosts: localhost
vars:
filelist:
- a
- b
tasks:
- stat:
path: "{{ item }}"
with_items: "{{ filelist }}"
register: all_files
- debug:
var: all_files
- debug:
msg: "Some file(s) missing"
when: "false in all_files['results'][*]['stat']['exists']"
ansible-playbook test.yml
...
TASK [debug] ********************************************************************
ok: [localhost] => {
"all_files": {
...
"item": "a",
"stat": {
...
"exists": true,
...
"item": "b",
"stat": {
"exists": false
...
TASK [debug] ********************************************************************
fatal: [localhost]: FAILED! => {"failed": true, "msg": "The conditional check 'false in all_files['results'][*]['stat']['exists']' failed. The error was: template error while templating string: unexpected '*'. String: {% if false in all_files['results'][*]['stat']['exists'] %} True {% else %} False {% endif %}\n\nThe error appears to have been in 'test.yml': line 16, column 5, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n - debug:\n ^ here\n"}
...
What is the correct syntax to use in the 'when:' clause? Or is this the wrong way altogether?

Answer 1

- hosts: localhost
gather_facts: false
vars:
file_vars:
- {name: file1}
- {name: file2}
tasks:
- name: Checking existing file name
stat:
path: ./{{ item.name }}
with_items: "{{ file_vars }}"
register: check_file_name
- debug:
msg: 'file name {{item.item.name}} not exists'
with_items: "{{ check_file_name.results }}"
when: item.stat.exists == False
- name: Create file
file:
path: "./{{item.item.name}}"
state: touch
with_items: "{{ check_file_name.results }}"
when: item.stat.exists == False