using a generator to seed the default value of an attribute

basic password field, with generator

https://github.com/openstack/fuel-web/blob/master/nailgun/nailgun/fixtures/openstack.yaml#L750-l753

  password:
    value:
      generator: "password"
    type: "password"

password field

https://github.com/openstack/fuel-web/blob/master/nailgun/nailgun/fixtures/openstack.yaml#L727-L735

  password:
    value: "admin"
    label: "Password"
    description: "Password for Administrator"
    weight: 20
    type: "password"
    regex:
      source: &non_empty_string '\S'
      error: "Empty password"

source of generator functions

https://github.com/openstack/fuel-web/blob/master/nailgun/nailgun/utils/__init__.py#L137-l193

usage of a generator

here dns_list attribute has it's default populated by a generator
https://github.com/openstack/fuel-web/blob/master/nailgun/nailgun/fixtures/openstack.yaml#L1057-l1067

  dns_list:
    value:
      generator: "from_settings"
      generator_arg: "DNS_UPSTREAM"
    label: "DNS list"
    description: "List of upstream DNS servers, separated by comma (up to 3 values)"
    weight: 10
    type: "text"
    regex:
      source: '^\*$|^(?:\d|1?\d\d|2[0-4]\d|25[0-5])(?:\.(?:\d|1?\d\d|2[0-4]\d|25[0-5])){3}(?:\s*,\s*(?:\d|1?\d\d|2[0-4]\d|25[0-5])(?:\.(?:\d|1?\d\d|2[0-4]\d|25[0-5])){3}){0,2}$'
      error: "Invalid IP address list"