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# loop-var-prefix
This rule avoids conflicts with nested looping tasks by enforcing an individual
variable name in loops. Ansible defaults to `item` as the loop variable. You can
use `loop_var` to rename it. Optionally require a prefix on the variable name.
The prefix can be configured via the `<loop_var_prefix>` setting.
This rule can produce the following messages:
- `loop-var-prefix[missing]` - Replace any unsafe implicit `item` loop variable
by adding `loop_var: <variable_name>...`.
- `loop-var-prefix[wrong]` - Ensure the loop variable starts with
`<loop_var_prefix>`.
This rule originates from the [Naming parameters section of Ansible Best
Practices guide][cop314].
## Settings
You can change the behavior of this rule by overriding its default regular
expression used to check loop variable naming. Keep in mind that the `{role}`
part is replaced with the inferred role name when applicable.
```yaml
# .ansible-lint
loop_var_prefix: "^(__|{role}_)"
```
This is an opt-in rule. You must enable it in your Ansible-lint configuration as
follows:
```yaml
enable_list:
- loop-var-prefix
```
## Problematic Code
```yaml
---
- name: Example playbook
hosts: localhost
tasks:
- name: Does not set a variable name for loop variables.
ansible.builtin.debug:
var: item # <- When in a nested loop, "item" is ambiguous
loop:
- foo
- bar
- name: Sets a variable name that doesn't start with <loop_var_prefix>.
ansible.builtin.debug:
var: zz_item
loop:
- foo
- bar
loop_control:
loop_var: zz_item # <- zz is not the role name so the prefix is wrong
```
## Correct Code
```yaml
---
- name: Example playbook
hosts: localhost
tasks:
- name: Sets a unique variable_name with role as prefix for loop variables.
ansible.builtin.debug:
var: myrole_item
loop:
- foo
- bar
loop_control:
loop_var: myrole_item # <- Unique variable name with role as prefix
```
[cop314]:
https://redhat-cop.github.io/automation-good-practices/#_naming_parameters
|
