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# no-jinja-when
This rule checks conditional statements for Jinja expressions in curly brackets `{{ }}`.
Ansible processes conditionals statements that use the `when`, `failed_when`, and `changed_when` clauses as Jinja expressions.
An Ansible rule is to always use `{{ }}` except with `when` keys.
Using `{{ }}` in conditionals creates a nested expression, which is an Ansible
anti-pattern and does not produce expected results.
## Problematic Code
```yaml
---
- name: Example playbook
hosts: localhost
tasks:
- name: Shut down Debian systems
ansible.builtin.command: /sbin/shutdown -t now
when: "{{ ansible_facts['os_family'] == 'Debian' }}" # <- Nests a Jinja expression in a conditional statement.
```
## Correct Code
```yaml
---
- name: Example playbook
hosts: localhost
tasks:
- name: Shut down Debian systems
ansible.builtin.command: /sbin/shutdown -t now
when: ansible_facts['os_family'] == "Debian" # <- Uses facts in a conditional statement.
```
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