OK, figured it out finally:

with_items: "{{ groups[project_name + '-masters'] }}"

{% for host in groups[project_name + '-masters'] %}


On Tuesday, January 13, 2015 at 3:28:08 PM UTC, David Goodall wrote:
>
> Hi,
>
> I used to have this:
> with_items: groups['masters']
>
> I have now changed the group name to reflect the project name, which is 
> entered into the "project_name" variable when the playbook is run.
> e.g. if the project is "test", the group will be "test-masters"
>
> In the "with_items:" statement, I would like to be able to replace 
> "masters" with something like {{ project_name }}-masters.
>
> The latest attempt is:
> with_items: groups['"ansible_" + project_name + "-masters"']
>
> I have been trawling this group and have tried various incantations, all 
> to no avail so far.
>
> For bonus points, I also have this in a jinja2 template:
> {% for host in groups['masters'] %}
>  - which will need the same treatment...
>
> Any help appreciated!
> Best regards,
> David
>

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