I would split your create user into 2 tasks.  1 for localhost and the other for 
web servers:

- name: Create localhost mysql users
  mysql_user: name=app host="{{ item }}"
  with_items:
    - localhost
    - 127.0.0.1

- name: Create webservers mysql users
  mysql_user: name=app host="{{ 
hostvars[item]['ansible_eth0']['ipv4']['address'] }}"
  with_items: groups['webservers']

-- 
Matt Martz
[email protected]

On March 4, 2014 at 3:09:35 PM, Michael Mahemoff ([email protected]) wrote:

I have a rule like this:

- name: Create user
  mysql_user: name=app
                     host=={{ item }}
                     ...
  with_items:
    - localhost
    - 127.0.0.1
    - "{{ groups['webservers'] }}"
    # - <here I want to list ip numbers of the webservers group>

How can I make the list include IP numbers of each webserver host. I know I can 
use ansible_eth0.ipv4.address to map from hostname to IP, but I don't know how 
to map a whole list to another list. And I can't see any way to define a 
variable as the result of a loop.
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