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Q&A How to validate Ansible role dictionary argument's "additionalProperties"

Apparently there just isn't an equivalent of additionalProperties in Ansible. The way around this is to break the dictionary argument into a list of key/value pairs: argument_specs: main: ...

posted 7mo ago by Iizuki‭  ·  edited 7mo ago by Iizuki‭

Answer
#2: Post edited by user avatar Iizuki‭ · 2023-10-11T13:42:43Z (7 months ago)
Grammar
  • Apparently there just isn't an equivalent of `additionalProperties` in Ansible.
  • The way around this is to break the dictionary argument into a list of key/value pairs:
  • ```yaml
  • argument_specs:
  • main:
  • options:
  • dictionary_argument:
  • description: A map from string to integers.
  • type: list
  • required: true
  • elements: dict
  • options:
  • key:
  • type: str
  • required: true
  • value:
  • type: int
  • required: true
  • ```
  • Just keep in mind that by doing this you loose some of dictionaries' implicit restriction of unique keys. If this is important, you will have to verify this manually in a task:
  • ```yaml
  • - name: Argument validation
  • vars:
  • original_length: "{{ dictionary_argument | length }}"
  • unique_length: "{{ dictionary_argument | unique(attribute='key') | length }}"
  • ansible.builtin.assert:
  • that:
  • - original_length == unique_length
  • ```
  • Apparently there just isn't an equivalent of `additionalProperties` in Ansible.
  • The way around this is to break the dictionary argument into a list of key/value pairs:
  • ```yaml
  • argument_specs:
  • main:
  • options:
  • dictionary_argument:
  • description: A map from string to integers.
  • type: list
  • required: true
  • elements: dict
  • options:
  • key:
  • type: str
  • required: true
  • value:
  • type: int
  • required: true
  • ```
  • Just keep in mind that by doing this you loose dictionaries' implicit restriction of unique keys. If this is important, you will have to verify this manually in a task:
  • ```yaml
  • - name: Argument validation
  • vars:
  • original_length: "{{ dictionary_argument | length }}"
  • unique_length: "{{ dictionary_argument | unique(attribute='key') | length }}"
  • ansible.builtin.assert:
  • that:
  • - original_length == unique_length
  • ```
#1: Initial revision by user avatar Iizuki‭ · 2023-10-11T13:27:55Z (7 months ago)
Apparently there just isn't an equivalent of `additionalProperties` in Ansible.

The way around this is to break the dictionary argument into a list of key/value pairs:

```yaml
argument_specs:
  main:
    options:
      dictionary_argument:
        description: A map from string to integers.
        type: list
        required: true
        elements: dict
        options:
          key:
            type: str
            required: true
          value:
            type: int
            required: true
```

Just keep in mind that by doing this you loose some of dictionaries' implicit restriction of unique keys. If this is important, you will have to verify this manually in a task:

```yaml
- name: Argument validation
  vars:
    original_length: "{{ dictionary_argument | length }}"
    unique_length: "{{ dictionary_argument | unique(attribute='key') | length }}"
  ansible.builtin.assert:
    that:
      - original_length == unique_length
```