skip a task with_subelements if its dictionary is undefined

[Nakai Tooru]

Hello,

Is it possible to skip a task with_subelements if its dictionary is undefined?

For example,

- authorized_key: "user={{ item.0.name }} key='{{ lookup('file', item.1)}}'"

  with_subelements:

    - users

    - authorized

  when: users is defined

This is failed with;

fatal: [localhost] => subelements lookup expects a dictionary, got 'users'.

It seems with_subelements evaluate the action before check condition.

Thanks

-- 

nakai

[Michael DeHaan]

With a simple list, you can do stuff like:

- shell: echo {{ item }}

  with_items: alist_that_may_be_undefined | default([])

Which will iterate over a list of 0 if there is nothing in it.

What you might wish to do is set users by default to an empty array (perhaps in roles/foo/defaults.yml) or something similar, to ensure it always has a value.

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[C. Morgan Hamill]

Excerpts from Michael DeHaan's message of 2014-08-20 08:51:01 -0400:

> With a simple list, you can do stuff like:
>
> - shell: echo {{ item }}
> with_items: alist_that_may_be_undefined | default([])

I'm fairly sure this works also:

- shell: echo {{ item }}
with_subelements:
- some_list|default([])
- some_subkey

--
Morgan Hamill

[Nakai Tooru]

Morgan Hamill:

This is what I want, awesome!

Thank you.

-- 

nakai 

[Michael DeHaan]

Ha, a nice consequence that that also works.  Much rejoicing!

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