ansible-role-drupal-settings/templates/settings.php.j2

<?php

// {{ ansible_managed }}

{% for key, values in item.1.settings.databases.iteritems() %}
$databases['{{ key }}']['default'] = [
  'driver' => '{{ values.driver }}',
  'host' => '{{ values.host }}',
  'database' => '{{ values.database }}',
  'username' => '{{ values.username }}',
  'password' => '{{ values.password }}',
];

{% endfor %}

{% if item.1.settings.base_url is defined %}
$base_url = '{{ item.1.settings.base_url }}';
{% endif %}

{% if item.1.settings.extra_parameters is defined %}
  {{ item.1.settings.extra_parameters|indent(0) }}
{% endif %}